Mma Plant

Trioxane Plant Proprietary Technology and Plants  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.

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.

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

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

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

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

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.