Reaction system for halogenating ion exchange resins and halogenation method of ion exchange resins

Abstract

The invention discloses a reaction system for halogenating ion exchange resins. The reaction system comprises a catalyst and a halogenating agent, wherein the catalyst is chloride and / or bromide; the mass of the catalyst accounts for 0.1%-5% of the mass of ion exchange resin to be halogenated; the halogenating agent comprises a solution A and a solution B, the solution A is hydrochloric acid of which the concentration is 0.1mol / L-12mol / L and / or hydrobromic acid of which the concentration is 0.1mol / L-12mol / L, the solute of the solution B is one or more hypochlorite, chlorate, perchlorate, hypobromite, bromate and perbromate. Furthermore, the invention also discloses a halogenation method of ion exchange resins. According to the reaction system for halogenating ion exchange resins disclosed by the invention, low-toxic salts and acids are adopted as halogen sources instead of chlorine and bromine with high toxicity, and all materials in the operation are liquid or solid and thus the potential safety hazard of toxic gas leakage is avoided and the reaction system is safer.

Description

technical field [0001] The invention belongs to the technical field of halogenation of ion exchange resins, and in particular relates to a reaction system and a halogenation method for halogenating ion exchange resins. Background technique [0002] Ion exchange resins, especially strong-acid cation exchange resins, are commonly used catalysts in many organic reactions such as etherification, esterification, and alkylation. However, resin catalysts generally have the disadvantage of poor thermal stability. The sulfonic acid group is easy to fall off, resulting in a reduction in catalytic activity. [0003] In order to improve the thermal stability of the resin, a common method is to bond electron-withdrawing groups, such as halogens and nitro groups, to the aromatic rings of the resin. There are generally three ways to introduce halogen into the resin: [0004] (1) Directly polymerize with halogen-containing monomers to prepare resins, as described in British Patent GB13935...

AI Technical Summary

Problems solved by technology

[0007] Among the three approaches, the halogenated monomers required by the first method are difficult to obtain and expensive, and are not suitable for large-scale industrial use. The resistance is large, it is difficult for the halogen to attack the ring, and the halogenation effect is not ideal

However, these elemental halogens are highly toxic, especially chlorine gas, which is not only highly toxic, but also has problems such as easy leakage and inconvenient operation.

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