Iso-Butyl Acetate Plant
Proprietary Technology and Plants
Technology Introduction:
There are two prevailing processes for iso-butyl acetate (IBA) production, i.e. iso-butanol-acetic acid esterification process and n_butene_acetic acid addition process. Due to its much lower production cost, new IBA plants usually use the Addition Process, which is the very technology SL TECH provides. It consists of four units, feedstock purification unit, esterification unit, product separation unit and acetic acid recovery unit. Compared to the Esterification Process, the Addition Process for IBA production has advantages such as shorter process flow, less equipment and lower production cost (50-60% of Esterification Process); lower energy consumption (only 5% of Esterification Process); easy operation, lower maintenance cost and lower operation cost; harmless and poisonless solid acid catalyst, less pollution, less equipment corrosion.
Technical Features:
1. Fixed Bed tubular Reactor To ensure the separation effect in the reactor, a disc distributor is arranged at the feedstock inlet; to strengthen the heat exchange effect and better control the temperature in the catalyst bed, baffles are designed in the reactor shell side; to reduce the energy consumption, two pre-heating stages are designed, the first stage is the plate heat exchanger while the second stage is the tubular heat exchanger.
2. Modified Cation Exchange Resin Catalyst The catalyst is high temperature resistant strong acid resin modified by metal chloride to prolongitself service life. Also after the modification, the conversion yield as weel as the selectivity will be increased at some extent.
UHMWPE Plant
Agent Technology and PlantsÂ
Technology Introduction:
Ultra high molecular weight polyethylene (hereinafter called as UHMWPE) is a linear structural polyethylene (PE) with viscosity-average molecular weight of more than 1,000,000 (ordinary polyethylene molecular weight is only about 200,000-300,000).The high relative molecular weight, which has given its extraordinary performance, and makes it a new type of high performance thermoplastic engineering plastics. Due to its high molecular weight, UHMWPE almost has integrated the advantages of all kinds of plastic, with common polyethylene and other engineering plastics incomparable corrosion resistance, impact resistance, self lubrication, corrosion resistance, low temperature resistance, health non-toxic, no adhesion, non water absorption and other comprehensive performance. Especially in the transmission of solid particles, powder, slurry and gas, UHMWPE has shown a unique superiorityï¼?thereby it is called asâ??amazing plasticâ?�.
SL TEC offers the technology to continuously produce UHMWPE by ethylene polymerization. The UHMWPE plant is composed of catalyst preparation unit ,polymerization unit ,the drying unit and separation unit, product transportation and storage units, product packaging unit, solvent recovery unit, exhaust gas treatment unit, chilled water unit, cooling water unit, the soft water preparation unit, compressed air and instrument air units.
Technical Features:
The UHMWPE production process adopts the method of low pressure and low temperature continuous polymerization technologyï¼?which is the most advanced in the industry. The advantages of this method include stable product quality, high yield, low energy consumption, low pollution, safe and reliable. All product grades can meet the current market demand for fiber grade, film grade and 9,000,000 molecular weight grade.
Performance:
Technology Introduction:
We offer complete package solutions for chemical distillation plant/distillation design/distillation tailoring using all-component analysis, process simulation, and a process automation package. Moreover, we also provide corresponding chemical sewage treatment solutions to satisfy the customers.
Chemical distillation plant/distillation design is our core competitiveness, we have engineering experiences in phenolic distillation plant, methanol-DMC distillation plant, coarse methanol distillation plant, fusil oil distillation plant, mixed aromatic distillation plant, light hydrocarbon distillation plant, acetate distillation plant (incl. methyl acetate, ethyl acetate, butyl-acetate and amyl-acetate) methylal distillation plant and dilute formalin enrichment plant.
Technical Features:
Our Capability in Distillation Design Software
â?¢ Partner
We have been cooperating with Tianjin University to establish a joint distillation engineering technology research center, which is mainly specialized in advanced distillation technologies, process control and troubleshooting.
Proprietary Technology and Plants
SL TEC has 15 years experience in acetic acid industry from technology R&D, plant design, engineering, and operation, has several reference plants and can ensure the safe, long term and stable running of the plant.
Our advantages lie in the following aspect:
1) The stability of catalyst is better compared to other process
2) The activity is better
3) The selectivity is higher
4) The process flow is short
5) Less equipment is required
6) The investment is lower
7) The enginery consumption is lower
Acetate Series Technology
Proprietary Technology and Plants
Technology Introdction
Acetate as green solvents are widely used in all fields. Our company adopts continuous esterification process to synthesize the corresponding acetate. Ethyl acetate and propyl acetate can be efficiently converted. The flexible production of different acetate products is realized in the same set according to the market situation. In this way, investment is reduced and anti market risk capability is increased.
Technology introduction
Acetates include ethyl acetate, acetaldehyde reduction, butyl acetate, amyl acetate and etc. As environmentally friendly solvent, they are widely used in areas such as solvents, monomers, plasticizer, surfactants and polymers.
The following introduction is the production process of various acetate:
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Ethyl acetate introduction
There are four main ethyl acetate synthesis route:
Acetate process, acetaldehyde, alcohol ethanol dehydrogenation and ethylene addition. Condensation with acetaldehyde perishable raw materials not suitable for long-distance transport, it is only suitable for the area which is built in raw acetaldehyde material; the process of ethanol dehydrogenation process is suitable for promoting in the rich and cheap areas of ethanol; and ethylene addition is suitable for areas with ethylene resources. In comparison, the esterification is less restrictive and more suitable for small scale production.
Butyl acetate intrduction
Main production methods including n-butyl acetate-acetic acid esterification and butylene acetate method. In comparison, acetate-butene additive has simple process, lower cost of raw materials and friendly production process and environment. It has a large advantage but there is also a problem of high purity butene materials that are not cheap.
Propyl acetate and amyl acetate introduction
Propyl acetate and amyl acetate production is currently dominated by esterification.
Technical Features:
Based on the above reasons, our company technical using acetic acid and the corresponding alcohols such as ethanol, propanol , isopropyl alcohol, butyl alcohol as the main raw materials and using continuous esternization method to Synthesize the corresponding acetate. Compared with the existing process, the technology adopts catalytic distillation process which can realize the efficient flexible production of ethyl acetate, propyl, ester, butyl and other products.
Crude Aromatic Separation Technology
Proprietary Technology and Plants
Technology Introdction:
Our company offers naphtha cutting, reorganization of C9 crude aromatic hydrocarbon separation, reforming C10 crude aromatic hydrocarbon separation and other crude aromatic hydrocarbon separation technology. My company's crude aromatic hydrocarbon separation process with advanced process, the process of flexible operation, the process of low energy consumption, product yield advantages.In the case of 60,000 tons / year C10 crude aromatic hydrocarbon separation, the high boiling point solvent product has high aromatic content, strong dissolving power, low toxicity, small smell, high flash point, high boiling point, moderate evaporation rate, stable chemical and physical properties, Good leveling, and does not contain chlorine and heavy metals / physical characteristics, especially in the post-evaporation stage can play a high solubility, so that the smoothness of the coating and no orange peel, good gloss. In addition, it can also be used as a cleaning agent for precision machinery and the deployment of pesticide emulsifier. Is the production of high-grade paint, paint, thinner, ink, adhesives, oil additives and high temperature reaction of the ideal solvent, but also as anthraquinone production of hydrogen peroxide extractant. In addition, it can also be used as a cleaning agent for precision machinery and the deployment of pesticide emulsifier. Is the production of high-grade paint, paint, thinner, ink, adhesives, oil additives and high temperature reaction of the ideal solvent, but also as anthraquinone production of hydrogen peroxide extractant.
Fusel Oil Separation Technology
Proprietary Technology and Plants
Technology Introdction:
At present, the domestic methanol plant to coal as raw material, the use of coal gasification of methanol. The methanol synthesis step is carried out by compressing the fresh feed gas from the low temperature methanol and carrying out the catalytic reaction in the methanol synthesis column to produce the crude methanol product and then producing the qualified alcohol by distillation. A small amount of fusel oil mostly directly into the fusel oil tank for sale, not fully utilized. If through my company's technological transformation, fusel oil can be fully utilized, and can produce good social and economic benefits.
Domestic coal chemical fusel oil treatment in two ways, namely, fuselage oil intermittent evaporative recovery and recovery of fusel oil continuous distillation.The former is intermittent operation, the size of fusel oil treatment is limited; The latter is through the provision of a methanol recovery column to recover methanol, while the preparation of C2-C6 alcohol fractions, the drawback is that the fine methanol is still containing more impurities, generally only as a low-grade products.
Technical Features:
In view of the above problems, our company relies on years of experience in chemical separation and customization, we using pressurized distillation and atmospheric distillation of the coupling method. Not only the top of the distillation column can be achieved to meet the national standard of high quality pure methanol, but also atmospheric distillation column using pressurized distillation column top material as a heat source, energy utilization has been greatly improved. More importantly, my company's matching fusel oil wastewater treatment process uses a two-step advanced oxidation and composite membrane - bioreactor (Membrane Bio-Reactor, MBR) in a combination of ways to meet ("petrochemical industry pollutants Emission standards "GB31571-2015) direct discharge standards and recycling water reuse standards, to solve the customer's worries.
Proposed amendments.
To 100,000 tons / year with 62.6% methanol fusel oil separation, for example.
Crude methanol refinery technology
Proprietary Technology and Plants
Technology Introdction:
Crude methanol rectification process includes single-column process, two-column process, three -column process and energy-saving three-column process. The feature of Four processes are as follows:
No.Crude methanol rectification processFeature
1single-column process1.Methonal-water regroup, separate in one column
2.Advatange: investment saving, reduce heat energy consumption
3.Disadvantage: the purity of refined methonal is not very pure.
2two-column process1.The combination of pre-recification column and main rectification column
2.Refine crude methonol including dimethyl ether and other light components and reducing impurities
3.Advantage: simple process ,user friendly, less investment
4.Disadvange: high energy consumption, low purity
3three -column process1.Three rectification column work under the same pressure. The third rectification column produces
2.Advantage: high purity
3.Disadvantage: high investment. Need more area
4energy-saving three-column process1.Two main rectification columns and final rectification column, the first main rectification column is pressure-increasing column. The second one is normal pressure column. Two columes produce 50%-50%
2.Advantage: envery saving, reduce the ethanol content of the purified methanol, product quality is better; methanol yield is higher, low operating costs
3.Disadvantage: high one-time investment
Our company's crude methanol distillation technology is based on the fourth energy-saving three-tower process, the main feature is to fully optimize the heat transfer network, so that the use of steam and circulating water to a minimum, in order to achieve energy conservation and investment optimization.
(1) High yield of the process: fine methanol recovery rate of 99.86% (refined methanol production and feed the amount of methanol contained in the ratio)
(2) Using a mature double-effect distillation method: the use of pressurized overhead gas phase for the atmospheric tower reboiler heat source.
To 300,000 tons / year 90.82% methanol distillation as an example.
Formic acid production technology
Agent Technology and Plants�
Technical Features:
Methanol Carbonylation�Synthesis of Formic Acid from Methyl Formate
Formic acid is an important chemical raw material for a wide range of uses. After the successful development and construction of methanol carbonylation of methyl formate 30,000 tons / year industrial plant, the company successfully developed methanol carbonylation of methyl formate , With a short process, easy to obtain raw materials, investment in the province, no waste emissions, the advantages of low production costs.
Performance:
Brief description of the process:
CO and methanol mixed with the catalyst after a certain pressure and temperature of the carbonylation reaction to form methyl formate, with methanol to absorb the tail gas entrainment of methyl formate, methanol, condensate back to the reactor. The crude product containing methyl formate is rectified in a pressurized distillation column, and the methyl formate product is withdrawn at the top of the column. The extracted product is filtered and removed to remove the spent catalyst and re
cycled to the reactor. ormic acid methyl ester mixed with water after preheating by the reactor into the formic acid hydrolysis reactor for hydrolysis reaction, the reaction of formic acid and methanol. The reaction solution is distilled, separated and distilled to produce the product formic acid; the unreacted methyl formate and the by-product methanol are recycled and recycled.
There are two prevailing processes for sec-butyl acetate (SBA) production, i.e. iso-butanol-acetic acid esterification process and n-butene -- acetic acid addition process. Due to its much lower production cost, new SBA plants usually use the Addition Process, which is the very technology SL TECH provides. It consists of four units, feedstock purification unit, esterification unit, product separation unit and acetic acid recovery unit. Compared to the Esterification Process, the Addition Process for SBA production has advantages such as shorter process flow, less equipment and lower production cost (50-60% of Esterification Process); lower energy consumption (only 5% of Esterification Process); easy operation, lower maintenance cost and lower operation cost; harmless and poisonless solid acid catalyst, less pollution, less equipment corrosion.
Formaldehyde Plant
Technology Introduction of Formaldehyde Plant
SL TEC has close to ten years experience in formaldehyde production technology based on silver contact process(or silver catalyzed process). A lower methanol consumption, higher formalin product concentration, high export steam capacity and ease of operation are our features, which makes it the best technical and economically viable solution.
Every unit operation incl. methanol evaporation, catalytic reaction, absorption, off-gas treatment has optional design to at best satisfy the customers needs.
We provide one-stop package solutions from the formaldehyde plant design, manufacture, erection, commissioning, startup to training, with the production capacity of 6,000TPA 120,000TPA and the formaldehyde product concentration varying from 37-55%. And according to the customers different needs, there are totally 7 (seven) optional processes as follows:
1) Traditional Bubble Evaporator + Absorber with 3 (three) Concentration Gradients to produce 37% formalin
2) New Evaporator + Absorber with 3 (three) Concentration Gradients to produce 37% formalin
3) Off-gas Circulation + Re-boiler + Absorber with 3 (three) Concentration Gradients to produce 37-42% formalin
4) Off-gas Circulation + Re-boiler + Absorber with 3 (three) Concentration Gradients to produce 37-55% formalin
5) Off-gas Circulation + Evaporation Column + Absorber with 6 (six) Concentration Gradients to produce 37-55% formalin
We agent the ASU packing of Tianjin Univtech Co., Ltd., who was honored as the technical center of national chemical packing tower and internal fitting in 1990, and whose High Efficiency Packing Column with New Type Column Internals have been listed as the key marketing project among Chinas the Eighth Five-Year Plan and the Ninth Five-Year Plan technology achievements.
Product Type Conventional ASU Packing Its plain edge design has improved the gas-liquid flow at the interface of two adjacent packing tray to decrease local resistance, avoid early flooding and enlarge the equipment flexibility range.
High Throughout Packing Especially applicable in large scale ASU. Its special edge curve transition structure has good division effect to reduce the liquid accumulation among packing trays, increase the packing flooding point and the operation flexibility.
Copper Made ASU Packing Especially applicable in the oxygen-rich section of ASU and in precious gas packing.compared to aluminium alloy material, it shows higher mass transfer capability and safety performance.
Product Features -Two kinds of angle: 45 degrees (Y)
-Variable shape
-Low pressure drop saving energy consumption
-Strong plasticity and insignificant retracting effect
-Maximum diameter of up to 4800mm
Methyl Acetate Plant
Proprietary Technologyand Plants
Technology Introduction:
The methyl acetate production process SL TEC propose is based on the condensation of acetic acid and methanol over a solid acid catalyst. This kind of catalyst is the best solution when high yields, low acetic acid and methanol consumption, consistent product and low equipment corrosion are required on reliable basis. Under normal operation, this catalyst has an average service life of three years or longer.
The reaction conditions are moderate, however, as methyl acetate, methanol and water will form binary and tertiary azeotropic mixtures, it is very difficult to prepare high purity product by conventional methods.
In the traditional process, one reactor and nine distillation columns are required to produce high purity methyl acetate. And they have main disadvantages incl.
1. The synthesis of methyl acetate is reversible, and due to the limitation of chemical equilibrium, the conversion yield is low.
2. Methyl acetate-water binary azeotrope, methyl acetate-methanol binary azeotrope, and methyl acetate-methanol-water ternary azeotrope have boiling points quite close to that of azeotrope, thereby, it is difficult to separate and the product purification is very complicated.
There are 4 main prevailing processes for ethyl acetate production, i.e. Direct Esterification Process, Acetaldehyde Condensation Process, Ethanol Dehydration Process and Acetic Acid-Ethylene Addition Process. Each process has its advantages and its applicable services. Our process is based on reactive-distillation esterification, which is mature, low costing and suitable for those with acetic acid feedstock.
Technical Features:
Advantages of Our Ethyl Acetate Plant and Process Technology
In our reactive distillation process, organic acid catalyst is used; its advantages cover the followings:
â?¢ Low ethanol consumption
â?¢ Low catalyst dosage
â?¢ High catalysis activity
â?¢ Low equipment corrosion
â?¢ Less side reactions
â?¢ Higher product purity
â?¢ Simple post-treatment operations
As the second monomer for polyacetal(POM) production,1,3-dioxolane has attracted great attention in recent years due to the expansion of its application, such as the solvent for grease, dyes, cellulose derivatives, polymers and etc, the stabilizer for trichloroethane, components of photosensitiser. There are usually two processes for 1,3-dioxolane production, one uses paraformaldehyde and MEG as the feedstock, while the other starts from concentrated formalin and MEG. SL Tech has been specialized in dioxolane production since 2008 based on concentrated formalin and MEG. In detail, in presence of concentrated sulfuric acid catalyst, enriched formalin and MEG reacts with each other @ 90-100oC atmospheric pressure, the resulting mixture is charged to Enrichment Unit, Extraction Unit, Heavy Components Distillation Unit and Light Components Distillation Unit in subsequence to get the finished 1,3-dioxolane product
Technical Features:
Compared to the other route beginning from paraformaldehyde and MEG, the process SL TEC provides has advangages as below:
1. It has no formalin polymerization, paraformaldehyde drying and aging units, thereby, the investment and the production cost is much lower.
2. It uses concentrated sulfuric acid as the catalyst, which has a higher conversion yield.
Trioxane Plant
Proprietary Technology and PlantsÂ
Technology Introduction:
Trioxane is the most important monomer for polyacetal(POM) synthesis, POM production technology with trioxane as the copolymerization monomer takes 80% of the total POM capacity in the world. It is usually synthesized by enriching 37% formalin to about 65% and then by oxidation in presence of acid catalyst such as sulfuric acid. The production consists of formalin enrichment, trioxane synthesis, trioxane enrichment, extraction, light components stripping and heavy components stripping.
Technical Features:
In trioxane production, one of the biggest problem is that a large amount of steam will be consumed by formalin enrichment and the treatment of diluted formalin generated from formalin enrichment. To solve this problem, SL TECH proposes to oxidize methylal into high concentration formalin(75%) directly instead of synthesis plus enrichment., and meanwhile the formalin generated from trioxane enrichment can be charged back to the methylal synthesis unit. In this way, a closed circuit system is formed. Also for those manufacturers with formalin as the only feedstock, SL TEC has the propriatary license to provide a special falling film vaporizer to enrich formalin to 78%-80%, and enrich the diluted formalin by-product by customized distillation.
O-Dihydroxybenzene Plant
Proprietary Technology and Plants
Technology Introduction:
There are over 10 methods for hydroquinone production, and among them the prevailings are Aniline Oxidation Process, p-DIPB Excess Oxidation Process and Phenol Hydroxylation Process. Their comparisons are shown in the following table. SL TECH's technology is based on Phenol Hydroxylation Process, in which phenol feedstock reacts with hydrogen peroxide in presence of catalyst to yield o-dihyoxybenzene and p-dihyoxybenzene. After removing water, high boiling point substances, phenol and separating out o-dihydroxybenze, crude p-dihyoxybenze is obtained and then charged for dissolving, discoloring, recrystallization before getting hydroquinone product.
MTBE Plant
Proprietary Technology and Plants
Technology Introduction:
MTBE is a colorless, transparent liquid, due to its high centane number and good blending property with gasoline, it is widely used as the gasoline additive; also it is hydrolysed to produce high purity iso-butene; thks to its chemical resistance, it is applied as reaction solvents, extractants and chromatography liquid. MTBE is produced by the etherification of methanol and mixed C-4(including iso-butene) in presence of acid catalyst. Depending on the different etherification reactor, there are mainly 6 MTBE production processes, i.e., Fixed Bed Reaction Process, Expansion Bed Reaction Process, Catalysis-Distillation Reaction Process, Expansion Bed-Catalysis Distillation Reaction Process, Mixed Phase Reaction Process and Mixed Phase Reaction Distillation Process. SL TEC offers Catalysis Distillation Reaction Process for MTBE production. This process combines mixed phase reaction with separation, blends the advantages of mixed phase reaction technology and that of catalysis distillation technology, which ensures in deep conversion (conversion yield reaching about 99%).
Technical Features:
Compared to the other MTBE production processes, the Catalysis Distillation Reaction Process has the following features:
1.Separation takes place simultaneously with the reaction, which increases the conversion yield.
2. The energy consumption is greatly reduced.
3. The production cost is also decreased.
MMA Plant
Agent Technology and PlantsÂ
Technology Introduction:
There are three prevailing processes for MMA, or methyl methacrylate production, C-2 Process starting from ethylene, methanol and formaldehyde, C-3 Process (also called as ACH Process) which uses the byproduct of HCN from acrylonitrile production as the feedstock, and C-4 process which uses isobutene or tertiary butanol as the feedstock. SL TEC provides MMA plant based C-4 Process, consisting of three working units, i.e. oxidation unit, distillation unit and esterification unit.
Technical Features:
The MMA plant offered by SL TEC has advantages such as easy availability of feedstock, more environment friendliness, lower investment, lower production cost and etc.
PPC Plant
Agent Technology and Plants
Technology Introduction:
PPC (polypropylene carbonate) is a completely biodegradable environment-friendly plastic synthesized from carbon dioxide and propylene oxide. Besides, due to its using the main source of greenhouse gases---CO2 as the feedstock, PPC not only reduces the emission of greenhouse gases, but also reduces the consumption of fossil fuel. Compared to the degradable PLA(polylactide), it has advantages of high strength, good ductility, lower production cost and etc. PPC polyol with low molecular weight are used to replace conventional petroleum-based polyether, polyester and polycarbonate polyols, while PPC with high molecular weight are employed as film products, oxygen barrier material, injection molding material and etc., especially in package industry and agriculture.
SL TEC offers high molecular weight PPC production technology, with the development history as below:
In 1998, the research of CO2 based
on line was built and successfully put into production;
In 2013, the technology was upgraded to increase the molecular weight to 300,000;
In 2016, a 30,000TPA PPC plant using new technology is under construction
Technical Features:
1. The number-average molecular weight of PPC using our technology reaches about 100,000, achieving the most advanced level in the world.
2. The tertiary catalyst ensures shorter polymerization time, i.e., 8 hrs, and within 8 hours the catalyst activity can reach a very high level.
3. For the production of per ton of PPC product, about 0.45-0.5 mt of carbon dioxide will be consumed. It not only makes use of the CO2, but also the PPC product is completely biodegradable and thereby reduces �??white pollution�??.
O-Dihydroxybenzene Plant
Proprietary Technology and Plants
Technology Introduction:
There are over 10 methods for hydroquinone production, and among them the prevailings are Aniline Oxidation Process, p-DIPB Excess Oxidation Process and Phenol Hydroxylation Process. Their comparisons are shown in the following table. SL TECH's technology is based on Phenol Hydroxylation Process, in which phenol feedstock reacts with hydrogen peroxide in presence of catalyst to yield o-dihyoxybenzene and p-dihyoxybenzene. After removing water, high boiling point substances, phenol and separating out o-dihydroxybenze, crude p-dihyoxybenze is obtained and then charged for dissolving, discoloring, recrystallization before getting hydroquinone product.
Formic acid production technology
Agent Technology and Plants
Technical Features:
Methanol CarbonylationSynthesis of Formic Acid from Methyl Formate
Formic acid is an important chemical raw material for a wide range of uses. After the successful development and construction of methanol carbonylation of methyl formate 30,000 tons / year industrial plant, the company successfully developed methanol carbonylation of methyl formate , With a short process, easy to obtain raw materials, investment in the province, no waste emissions, the advantages of low production costs.
Performance:
Brief description of the process:
CO and methanol mixed with the catalyst after a certain pressure and temperature of the carbonylation reaction to form methyl formate, with methanol to absorb the tail gas entrainment of methyl formate, methanol, condensate back to the reactor. The crude product containing methyl formate is rectified in a pressurized distillation column, and the methyl formate product is withdrawn at the top of the column. The extracted product is filtered and removed to remove the spent catalyst and re
cycled to the reactor. ormic acid methyl ester mixed with water after preheating by the reactor into the formic acid hydrolysis reactor for hydrolysis reaction, the reaction of formic acid and methanol. The reaction solution is distilled, separated and distilled to produce the product formic acid; the unreacted methyl formate and the by-product methanol are recycled and recycled.
Crude methanol refinery technology
Proprietary Technology and Plants
Technology Introdction:
Crude methanol rectification process includes single-column process, two-column process, three -column process and energy-saving three-column process. The feature of Four processes are as follows:
No.Crude methanol rectification processFeature
1single-column process1.Methonal-water regroup, separate in one column
2.Advatange: investment saving, reduce heat energy consumption
3.Disadvantage: the purity of refined methonal is not very pure.
2two-column process1.The combination of pre-recification column and main rectification column
2.Refine crude methonol including dimethyl ether and other light components and reducing impurities
3.Advantage: simple process ,user friendly, less investment
4.Disadvange: high energy consumption, low purity
3three -column process1.Three rectification column work under the same pressure. The third rectification column produces
2.Advantage: high purity
3.Disadvantage: high investment. Need more area
4energy-saving three-column process1.Two main rectification columns and final rectification column, the first main rectification column is pressure-increasing column. The second one is normal pressure column. Two columes produce 50%-50%
2.Advantage: envery saving, reduce the ethanol content of the purified methanol, product quality is better; methanol yield is higher, low operating costs
3.Disadvantage: high one-time investment
Our company's crude methanol distillation technology is based on the fourth energy-saving three-tower process, the main feature is to fully optimize the heat transfer network, so that the use of steam and circulating water to a minimum, in order to achieve energy conservation and investment optimization.
(1) High yield of the process: fine methanol recovery rate of 99.86% (refined methanol production and feed the amount of methanol contained in the ratio)
(2) Using a mature double-effect distillation method: the use of pressurized overhead gas phase for the atmospheric tower reboiler heat source.
To 300,000 tons / year 90.82% methanol distillation as an example.
Formaldehyde Plant
Technology Introduction of Formaldehyde Plant
SL TEC has close to ten years experience in formaldehyde production technology based on silver contact process(or silver catalyzed process). A lower methanol consumption, higher formalin product concentration, high export steam capacity and ease of operation are our features, which makes it the best technical and economically viable solution.
Every unit operation incl. methanol evaporation, catalytic reaction, absorption, off-gas treatment has optional design to at best satisfy the customers needs.
We provide one-stop package solutions from theformaldehyde plant design, manufacture, erection, commissioning, startup to training, with the production capacity of 6,000TPA 120,000TPA and the formaldehyde product concentration varying from 37-55%. And according to the customers different needs, there are totally 7 (seven) optional processes as follows:
1) Traditional Bubble Evaporator + Absorber with 3 (three) Concentration Gradients to produce 37% formalin
2) New Evaporator + Absorber with 3 (three) Concentration Gradients to produce 37% formalin
3) Off-gas Circulation + Re-boiler + Absorber with 3 (three) Concentration Gradients to produce 37-42% formalin
4) Off-gas Circulation + Re-boiler + Absorber with 3 (three) Concentration Gradients to produce 37-55% formalin
5) Off-gas Circulation + Evaporation Column + Absorber with 6 (six) Concentration Gradients to produce 37-55% formalin
Methyl Acetate Plant
Proprietary Technologyand Plants
Technology Introduction:
The methyl acetate production process SL TEC propose is based on the condensation of acetic acid and methanol over a solid acid catalyst. This kind of catalyst is the best solution when high yields, low acetic acid and methanol consumption, consistent product and low equipment corrosion are required on reliable basis. Under normal operation, this catalyst has an average service life of three years or longer.
The reaction conditions are moderate, however, as methyl acetate, methanol and water will form binary and tertiary azeotropic mixtures, it is very difficult to prepare high purity product by conventional methods.
In the traditional process, one reactor and nine distillation columns are required to produce high purity methyl acetate. And they have main disadvantages incl.
1. The synthesis of methyl acetate is reversible, and due to the limitation of chemical equilibrium, the conversion yield is low.
2. Methyl acetate-water binary azeotrope, methyl acetate-methanol binary azeotrope, and methyl acetate-methanol-water ternary azeotrope have boiling points quite close to that of azeotrope, thereby, it is difficult to separate and the product purification is very complicated.
There are 4 main prevailing processes for ethyl acetate production, i.e. Direct Esterification Process, Acetaldehyde Condensation Process, Ethanol Dehydration Process and Acetic Acid-Ethylene Addition Process. Each process has its advantages and its applicable services. Our process is based on reactive-distillation esterification, which is mature, low costing and suitable for those with acetic acid feedstock.
Technical Features:
Advantages of Our Ethyl Acetate Plant and Process Technology
In our reactive distillation process, organic acid catalyst is used; its advantages cover the followings:
Low ethanol consumption
Low catalyst dosage
High catalysis activity
Low equipment corrosion
Less side reactions
Higher product purity
Simple post-treatment operations
Dimethyl Carbonate (DMC) Refining Technology
Proprietary Technology and Plants
Technology Introdction:
Dimethyl carbonate (DMC) is an important organic chemical intermediates, it widely used in carbonylation, methylation, methoxylation and carbonyl methylation and other organic synthesis reaction. Because DMC is non-toxic, it can replace the highly toxic phosgene, methyl chloroformate, dimethyl sulfate as a methylating agent or carbonylation agent used to improve the safety of production operations and reduce environmental pollution. As a solvent, DMC can replace freon, trichloroethane, trichlorethylene, benzene, xylene and so on for paint coatings, cleaning solvents. As a gasoline additive, DMC can improve its octane number and oxygen content, thereby enhancing its antiknock. In addition, DMC can be used as detergent, surfactant and softener additives.
In the process of oxidizing carbonylation of methanol to dimethyl carbonate, the reaction solution contains a large amount of unreacted raw materials and by-products (such as formaldehyde, trioxaldehyde and the like) in addition to DMC, and further separation is required to obtain DMC products.
As the raw materials containing formaldehyde, trioxaldehyde and other impurities, these impurities on the follow-up distillation process and equipment selection has a significant impact, so the need for pre-treatment device for pre-removal, removal of formaldehyde, trimethyl formaldehyde after the material into the follow-up Of the distillation system. Removal of formaldehyde and paraformaldehyde materials due to methanol and DMC forming azeotrope, ordinary distillation can not get a pure product, therefore, it usually using two-step separation combinedï¼?The first step is the initial distillation stage, the use of azeotropic distillation way, in the packed column to obtain methanol-DMC azeotrope, and other products separatedïIn the second step, the DMC was obtained by the effective separation method. The main methods were low temperature crystallization, extraction distillation, azeotropic distillation and pressurized distillation. The purity was higher than 99.9 % High purity DMC products.
UHMWPE Plant
Agent Technology and Plants
Technology Introduction:
Ultra high molecular weight polyethylene (hereinafter called as UHMWPE) is a linear structural polyethylene (PE) with viscosity-average molecular weight of more than 1,000,000 (ordinary polyethylene molecular weight is only about 200,000-300,000).The high relative molecular weight, which has given its extraordinary performance, and makes it a new type of high performance thermoplastic engineering plastics. Due to its high molecular weight, UHMWPE almost has integrated the advantages of all kinds of plastic, with common polyethylene and other engineering plastics incomparable corrosion resistance, impact resistance, self lubrication, corrosion resistance, low temperature resistance, health non-toxic, no adhesion, non water absorption and other comprehensive performance. Especially in the transmission of solid particles, powder, slurry and gas, UHMWPE has shown a unique superiority?thereby it is called as amazing plastic??.
SL TEC offers the technology to continuously produce UHMWPE by ethylene polymerization. The UHMWPE plant is composed of catalyst preparation unit ,polymerization unit ,the drying unit and separation unit, product transportation and storage units, product packaging unit, solvent recovery unit, exhaust gas treatment unit, chilled water unit, cooling water unit, the soft water preparation unit, compressed air and instrument air units.
Technical Features:
The UHMWPE production process adopts the method of low pressure and low temperature continuous polymerization technology?which is the most advanced in the industry. The advantages of this method include stable product quality, high yield, low energy consumption, low pollution, safe and reliable. All product grades can meet the current market demand for fiber grade, film grade and 9,000,000 molecular weight grade.
Performance:
Dimethyl Carbonate (DMC) Refining Technology
Proprietary Technology and Plants
Technology Introdction:
Dimethyl carbonate (DMC) is an important organic chemical intermediates, it widely used in carbonylation, methylation, methoxylation and carbonyl methylation and other organic synthesis reaction. Because DMC is non-toxic, it can replace the highly toxic phosgene, methyl chloroformate, dimethyl sulfate as a methylating agent or carbonylation agent used to improve the safety of production operations and reduce environmental pollution. As a solvent, DMC can replace freon, trichloroethane, trichlorethylene, benzene, xylene and so on for paint coatings, cleaning solvents. As a gasoline additive, DMC can improve its octane number and oxygen content, thereby enhancing its antiknock. In addition, DMC can be used as detergent, surfactant and softener additives.
In the process of oxidizing carbonylation of methanol to dimethyl carbonate, the reaction solution contains a large amount of unreacted raw materials and by-products (such as formaldehyde, trioxaldehyde and the like) in addition to DMC, and further separation is required to obtain DMC products.
As the raw materials containing formaldehyde, trioxaldehyde and other impurities, these impurities on the follow-up distillation process and equipment selection has a significant impact, so the need for pre-treatment device for pre-removal, removal of formaldehyde, trimethyl formaldehyde after the material into the follow-up Of the distillation system. Removal of formaldehyde and paraformaldehyde materials due to methanol and DMC forming azeotrope, ordinary distillation can not get a pure product, therefore, it usually using two-step separation combined?The first step is the initial distillation stage, the use of azeotropic distillation way, in the packed column to obtain methanol-DMC azeotrope, and other products separatedIn the second step, the DMC was obtained by the effective separation method. The main methods were low temperature crystallization, extraction distillation, azeotropic distillation and pressurized distillation. The purity was higher than 99.9 % High purity DMC products.
PPC Plant
Agent Technology and Plants
Technology Introduction:
PPC (polypropylene carbonate) is a completely biodegradable environment-friendly plastic synthesized from carbon dioxide and propylene oxide. Besides, due to its using the main source of greenhouse gases---CO2 as the feedstock, PPC not only reduces the emission of greenhouse gases, but also reduces the consumption of fossil fuel. Compared to the degradable PLA(polylactide), it has advantages of high strength, good ductility, lower production cost and etc. PPC polyol with low molecular weight are used to replace conventional petroleum-based polyether, polyester and polycarbonate polyols, while PPC with high molecular weight are employed as film products, oxygen barrier material, injection molding material and etc., especially in package industry and agriculture.
SL TEC offers high molecular weight PPC production technology, with the development history as below:
In 1998, the research of CO2 based
on line was built and successfully put into production;
In 2013, the technology was upgraded to increase the molecular weight to 300,000;
In 2016, a 30,000TPA PPC plant using new technology is under construction
Technical Features:
1. The number-average molecular weight of PPC using our technology reaches about 100,000, achieving the most advanced level in the world.
2. The tertiary catalyst ensures shorter polymerization time, i.e., 8 hrs, and within 8 hours the catalyst activity can reach a very high level.
3. For the production of per ton of PPC product, about 0.45-0.5 mt of carbon dioxide will be consumed. It not only makes use of the CO2, but also the PPC product is completely biodegradable and thereby reduces ??white pollution??.
Fusel Oil Separation Technology
Proprietary Technology and Plants
Technology Introdction:
At present, the domestic methanol plant to coal as raw material, the use of coal gasification of methanol. The methanol synthesis step is carried out by compressing the fresh feed gas from the low temperature methanol and carrying out the catalytic reaction in the methanol synthesis column to produce the crude methanol product and then producing the qualified alcohol by distillation. A small amount of fusel oil mostly directly into the fusel oil tank for sale, not fully utilized. If through my company's technological transformation, fusel oil can be fully utilized, and can produce good social and economic benefits.
Domestic coal chemical fusel oil treatment in two ways, namely, fuselage oil intermittent evaporative recovery and recovery of fusel oil continuous distillation.The former is intermittent operation, the size of fusel oil treatment is limited; The latter is through the provision of a methanol recovery column to recover methanol, while the preparation of C2-C6 alcohol fractions, the drawback is that the fine methanol is still containing more impurities, generally only as a low-grade products.
Technical Features:
In view of the above problems, our company relies on years of experience in chemical separation and customization, we using pressurized distillation and atmospheric distillation of the coupling method. Not only the top of the distillation column can be achieved to meet the national standard of high quality pure methanol, but also atmospheric distillation column using pressurized distillation column top material as a heat source, energy utilization has been greatly improved. More importantly, my company's matching fusel oil wastewater treatment process uses a two-step advanced oxidation and composite membrane - bioreactor (Membrane Bio-Reactor, MBR) in a combination of ways to meet ("petrochemical industry pollutants Emission standards "GB31571-2015) direct discharge standards and recycling water reuse standards, to solve the customer's worries.
Proposed amendments.
To 100,000 tons / year with 62.6% methanol fusel oil separation, for example.
