Process for recovering bromine from waste liquid

Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...

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Details

210754, 423505, C02F 176, C01B 709

Patent

active

043246656

ABSTRACT:
This is a process for recovering bromine from a waste liquid formed in the production of an aniline derivative by ammonolysis of a nuclear substituted bromobenzene derivative with a halogen atom or a functional group. The waste liquid is first subjected to chlorine treatment in alkaline region to remove most part of ammonia and aniline derivatives, and then it is subjected to chlorine treatment in acidic region to recover bromine. The process does not involve danger of explosion accidents and can be smoothly operated.

REFERENCES:
patent: 2359221 (1944-09-01), Kenaga
patent: 3371998 (1968-03-01), Schambra
patent: 3401203 (1968-09-01), Kralman et al.
patent: 4031194 (1977-06-01), Ogawa et al.

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