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:
May. 19, 1987
Filed:
Oct. 17, 1985
Nissan Chemical Industries, Ltd., Tokyo, JP;
Abstract
A process for producing chlorobenzene sulfochloride comprises adding a reaction mixture of chlorobenzene and chlorosulfonic acid to water or diluted sulfuric acid to decompose excess chlorosulfonic acid; driving off hydrogen chloride thereby generated, from the system; bringing the sulfuric acid concentration in the sulfuric acid layer upon completion of the decomposition to be from 60 to 90%; and then separating chlorobenzene sulfochloride. The process is characterized in that the excess chlorosulfonic acid is decomposed at a temperature of from 40.degree. to 85.degree. C. and the chlorobenzene sulfochloride is separated in a liquid state at a temperature of from 60.degree. to 80.degree. C.