Preparation method of dimethyldiallylammonium chloride with low salt

Abstract

The invention relates to a preparation method of dimethyldiallylammonium chloride with low salt. The technical solution is as follows: (1) controlling the reaction process to control and reduce the production of by-products in the reaction; (2) strictly control the rate of charge of the reaction to control the occurrence of the side reaction; (3) adjusting the pH value of the reacted system, vacuumizing to remove volatile light component impurities; and (4) controlling the process of temperature decrease of the system after concentration to reduce the salt content of the system. The beneficialeffect of the invention is as follows: compared with the traditional preparation method of dimethyldiallylammonium chloride, the method of the invention has the advantage of simple process, low production cost, high product purity, high activity, less environmental pollution and the like; the defects of the traditional method (two-step method) for preparing dimethyldiallylammonium chloride that organic solvent is contained in the product, the purity is low, the technical operation steps are many and the conversion rate is low and the defect of the one-step production method that the content of sodium chloride is high are avoided and the method has prominent long contribution for the reduction of production cost, the environment protection and the like.

Description

1. Technical field: [0001] The invention relates to a production process for one-step production of cationic monomers with low salt content, in particular to a production method for low salt content dimethyl diallyl ammonium chloride. 2. Background technology: [0002] The research on cationic monomer dimethyl diallyl ammonium chloride in my country began in the late 1980s. At that time, a two-step method was used to synthesize tertiary amines first, and then synthesize quaternary ammonium salts to obtain finished products after purification by organic solvents. The main disadvantages are complex process, serious environmental pollution, low yield, low product purity, low activity and high production cost. One-step method (also known as one-pot method) appeared in the late 1990s. Compared with the two-step method, this method has greatly improved and improved, but it has strict requirements on raw material indicators and needs to be refined, so the energy consumption is high,...

AI Technical Summary

Problems solved by technology

[0002] The research on cationic monomer dimethyl diallyl ammonium chloride in my country began in the late 1980s. At that time, a two-step method was used to synthesize tertiary amines first, and then synthesize quaternary ammonium salts to obtain finished products after purification by organic solvents. The main disadvantages are complicated process, serious environmental pollution, low yield, low product purity, low activity and high production cost

One-step method (also known as one-pot method) appeared in the late 1990s. Compared with the two-step method, this method has been greatly improved and improved, but it has strict requirements on raw material indicators and needs to be refined, so the energy consumption is high, the conversion rate is low, and the product purity is high. Low, low activity; and the by-product sodium chloride content in the system is high

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