Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1980-11-05
1982-04-13
Wyse, Thomas G.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
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.
Ikeda Minoru
Mohri Akio
Ota Kiyoshi
Yamada Takeo
Yokomichi Isao
Ishihara Sangyo Kaisha Ltd.
Nissan Chemical Industries Ltd.
Wyse Thomas G.
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