Industrial preparation method of acryloyloxyethyl trimethyl ammonium chloride

Abstract

The invention provides an industrial preparation method of acryloyloxyethyl trimethyl ammonium chloride. The method comprises the following steps: adding dimethylamino ethyl acrylate, deionized water and methane chloride into a first-stage reactor for feeding; after the first-stage reactor finishes feeding, transferring the materials in the first-stage reactor into a second-stage reactor to react for 0.5-1.0 h; transferring the material in the second-stage reactor into a third-stage reactor, and reacting for 0.5-1.0 h to obtain a primary product; carrying out steam stripping treatment on the primary product in a steam stripping tower; and placing a stripping tower bottom solution obtained through stripping treatment into a fourth-stage reactor, stirring, transferring a material in the fourth-stage reactor into a fifth-stage reactor, and stirring to obtain the acryloyloxyethyl trimethyl ammonium chloride. According to the industrial preparation method, multiple reaction kettles are adopted for intermittent reaction, industrial continuous production is achieved, high efficiency is achieved, the product yield is high, and the methane chloride separation effect is good.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to an industrial preparation method of acryloyloxyethyltrimethylammonium chloride. Background technique [0002] Acryloyloxyethyltrimethylammonium chloride is one of the quaternary ammonium salt raw materials required for the production of cationic acrylamide polymers. Cationic acrylamide polymers are used in petrochemical, papermaking, textile printing and dyeing, daily chemicals, especially as flocculation It has important application value in water treatment, sludge dewatering and other fields, so the market demand of acryloyloxyethyltrimethylammonium chloride has grown steadily. [0003] The Chinese patent with the application number of CN201110142015.8 discloses a method for producing (meth)acryloyloxyethyltrimethylammonium chloride by transesterification, in the combination of polymerization inhibitor and basic anion exchange resin as catalyst. Under the action, (m...

AI Technical Summary

Problems solved by technology

But this method needs to add polymerization inhibitor in the initial process, easily causes the prepared product purity to be lower; Basic anion exchange resin has the process of regeneration simultaneously, and easily deactivates, and is difficult in actual industrial operation; In addition, because Trimethylamine can corrode aluminum, magnesium, zinc, tin, copper, and copper alloys, etc., and has an unpleasant smell. Storage and application requirements are high, resulting in high overall actual operating costs

[0004] The method for preparing acryloyloxyethyltrimethylammonium chloride under pressurized conditions with dimethylaminoethyl acrylate and monochloromethane can effectively solve the above problems at present, but there is still a difference between the injection rate of monochloromethane and the dichloromethane in this method. The stirring rate of the reactor is uncoordinated, the liquid flow in the reactor is unscientific, and the reactants cannot be fully contacted, resulting in a low conversion rate of dimethylaminoethyl acrylate

At the same time, in the later stage of the reaction, the viscosity of the reaction system increases, and the reactor cannot effectively extract the heat of the reaction and locally overheats and self-polymerizes, resulting in difficulties in post-processing of the product

For the recovery of excess monochloromethane added, the adsorption rate of traditional activated carbon is up to 75%, and it cannot be reused after adsorption, resulting in waste of activated carbon