Amination system of pp-st-dvb-based strong base ion exchange fiber

Abstract

The invention discloses an amination system for PP‑ST‑DVB-based strong alkali ion exchange fibers, which includes a horizontal high-pressure reactor and a column reactor. The wet state PP‑ST‑DVB fiber is placed in the horizontal reactor, and the In the cylindrical reaction kettle, the aqueous solution of trimethylamine hydrochloride and NaOH solid solution undergoes a neutralization reaction to release trimethylamine gas; trimethylamine gas enters the horizontal high-pressure reaction kettle through the gas, and rapidly amines under the conditions of heating and high pressure. chemical reaction; after the reaction, the trimethylamine on the surface of the fiber is volatilized as much as possible under the conditions of high-speed rotation of the cylinder inside the horizontal reactor, heating and decompression, and most of the trimethylamine gas is condensed and recovered for continued use. A small amount of trimethylamine The amine gas is absorbed by dilute sulfuric acid; after the reaction, the fiber is taken out from the reactor, put into an oven for drying or air-dried to obtain the quaternary ammonium strong alkali ion exchange fiber.

Description

technical field [0001] The invention belongs to the technical field of preparation of ion exchange materials, and relates to an improved amination system for preparing strong alkali ion exchange fibers from PP-ST-DVB fibers. system. Background technique [0002] Ion exchange fiber has the advantages of fast adsorption speed, high degree of purification, small water resistance, and convenient regeneration. It can absorb harmful gases, remove heavy metals, remove odors, purify water sources, desalinate seawater, etc., and has attracted more and more attention. Generally speaking, ion exchange fibers are divided into: strong acid ion exchange fibers, strong base ion exchange fibers, weak acid ion exchange fibers, weak base ion exchange fibers, and the preparation process of common quaternary ammonium strong base ion exchange fibers is in During amination, an aqueous solution of trimethylamine is usually used as an amination reagent; the concentration of an aqueous solution of ...

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Problems solved by technology

[0003] In order to solve the problems of low trimethylamine aqueous solution concentration and unfavorable amination reaction when preparing strong base ion exchange fibers in the prior art, the present invention proposes the amination system of PP-ST-DVB base strong base ion exchange fibers, and the amination reagent adopts The trimethylamine hydrochloride and the aqueous solution after the NaOH solid solution neutralize the trimethylamine gas released by the reaction, the trimethylamine gas enters the reactor, and forms a high Concentrated trimethylamine aqueous solution, under relatively high pressure and temperature, quickly completes the amination reaction; after the reaction is completed, the trimethylamine on the surface of the fiber is made as much as possible under the conditions of high-speed rotation of the cylinder inside the horizontal reactor and heating and decompression. Most of the volatilization is recovered by condensation and continued to be used, and a small amount is absorbed by dilute sulfuric acid; finally, the fiber is taken out from the reactor, dried in an oven or dried naturally to obtain a quaternary ammonium type strong alkali ion exchange fiber, and the entire amination reaction Reaction in a closed system greatly reduces the leakage of trimethylamine gas

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