Lignin is an anionic surfactant. Two of pulp and sulfur chloride solution and sulfite reaction product of pulp production is a by-product, usually 4-hydroxy-3-trimethoxybenzaldehyde of polymers. The general quality of low molecular weight sulfonates, mostly for straight-chain, the solution associating together; polymer lignosulfonate branch chain mostly in aqueous polymerization shown -- referred to the act. The absence of lignin sulfonate widely used in animal feed grain, refined lignin sulfonate for oil drilling mud dispersant; flotation agent, slime, dyes, pesticides dispersant; the heavy metals, especially iron, copper, tin ions better chelating ability to be an effective the chelating agent.