Preparation method of quaternary ammonium cationic monomer aqueous solution

Abstract

The invention discloses a preparation method of a quaternary ammonium cationic monomer aqueous solution. The preparation method comprises the following steps: after fully mixing a mixture of unsaturated tertiary amine and a polymerization inhibitor with water, continuously feeding the mixture to a tower reactor from the upper part of the tower reactor; and continuously introducing gas halohydrocarbon from the lower part of the tower reactor to the tower reactor, wherein the unsaturated tertiary amine and the gas halohydrocarbon in the tower reactor are in countercurrent contact to react, the reaction temperature is 35-60 DEG C and the reaction time is 3-15 minutes. The preparation method disclosed by the invention realizes continuous production and is short in reaction time, and the conversion ratio of the unsaturated tertiary amine reaches over 99.8%, the content of a byproduct acrylic acid is less than 1000ppm, the content of the byproduct is low, the product yield is high and the product quality is stable.

Description

technical field [0001] The invention belongs to the field of chemical products, and in particular relates to a preparation method of an aqueous solution of a quaternary ammonium salt type cationic monomer. Background technique [0002] Quaternary ammonium salt-type cationic monomers (such as acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride) are one of the key raw materials for the synthesis of cationic polyacrylamide, and are widely used in Synthetic water treatment flocculants have important uses in environmental protection, papermaking, oil recovery, soil improvement, etc. [0003] The synthesis reaction of the quaternary ammonium cationic monomer can be carried out in a reactor, using water as a solvent, adding the unsaturated tertiary amine as the reaction raw material to the reactor at one time, and then continuously adding halogenated hydrocarbons to remove the heat of reaction while reacting , so as to obtain the aqueous solu...

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Problems solved by technology

Moreover, it takes a long time to stabilize the reaction conditions, and the production efficiency is low

This method is also difficult to make production conditions such as reaction temperature, the proportioning ratio of reaction raw materials stable, and product quality also becomes unstable easily.

[0006] Japanese Patent Laid-Open No. 7-206790 discloses a synthesis method of quaternary ammonium salt-type cationic monomers. The synthesis reaction is carried out in a thin-film steamer reactor, which greatly shortens the reaction time and can reduce the hydrolysis of raw materials, but the conversion rate of raw materials is low. , the product yield is low

Moreover, the structure of this thin film evaporator reactor is complex, the production efficiency is low, the price is expensive, and it needs stirring to assist mass transfer, which limits the large-scale application of this process in industry

U.S. Patent No. 6,686,203 uses a rotating disk stirring tower to carry out the reaction continuously, but there is a problem that the residence time of the material is too long

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