The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 13, 1982
Filed:
Nov. 05, 1980
Applicant:
Inventors:
Isao Yokomichi, Moriyama, JP;
Takeo Yamada, Nagoya, JP;
Akio Mohri, Yokkaichi, JP;
Kiyoshi Ota, Tokyo, JP;
Minoru Ikeda, Onoda, JP;
Assignees:
Ishihara Sangyo Kaisha, Ltd., Osaka, JP;
Nissan Chemical Industries, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F / ; C01B / ;
U.S. Cl.
CPC ...
210718 ; 210754 ; 423505 ;
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.