Resin for adsorbing parachloroaniline in para-ester as well as synthesis method and application of resin

Abstract

The invention relates to resin for adsorbing parachloroaniline in para-ester as well as a synthesis method and application of the resin. The synthesis method comprises the following steps: mixing a polystyrene polymer, aluminum trichloride and dimethyl fumarate for reaction to obtain a dimethyl fumarate modified polymer; and cleaning and drying the dimethyl fumarate modified polymer to obtain the resin for adsorbing parachloroaniline. The dimethyl fumarate molecules are covalently combined on the surface of the polystyrene polymer, so that hydrogen-bond interaction or adsorption can be generated on amino groups of p-chloroaniline, the para-ester can be slightly adsorbed, differential adsorption can be generated between the p-chloroaniline and the para-ester, and the removal of the p-chloroaniline in a para-ester product is extremely facilitated.

Description

technical field [0001] The invention relates to the technical field of dye intermediates, in particular to a resin for adsorbing p-chloroaniline in para-esters, its synthesis method and its application. Background technique [0002] p-(β-hydroxyethylsulfone sulfate) aniline, also known as p-ester, is an important intermediate in the synthesis of reactive dyes. In the synthesis of para-ester, the current synthesis process mainly uses chlorosulfonic acid thionyl chloride to carry out sulfonation of p-aniline, the sulfonated compound is reduced and then condensed with ethylene oxide, and finally the step of sulfate esterification Obtained, its final product contains a certain amount of p-chloroaniline, and p-chloroaniline is a kind of aromatic amine. With the improvement of the country's environmental protection requirements for printing and dyeing textile products, the requirements for the prohibition of aromatic amines in textile products are becoming more and more stringent...

AI Technical Summary

Problems solved by technology

The para-ester yield obtained by this method is higher, and the amino value and ester value are better, but the p-chloroaniline in its product is still difficult to reduce to meet the requirements of national standards

[0004] In addition, various manufacturers also generally adopt the method of adsorption and filtration to reduce the content of p-chloroaniline. This method can dispose of the by-product of p-chloroaniline produced in the synthesis of para-ester, but the cost is relatively high, and solid waste is generated at the same time. , which not only increases production costs, but also increases the risk of environmental pollution

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