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. 19, 1988
Filed:
Jan. 16, 1986
Gail H Birum, Kirkwood, MO (US);
Richard F Jansen, St. Louis, MO (US);
Akzo America Inc., New York, NY (US);
Abstract
A process improvement for the preparation of arylsulfonamides that avoids the multistep arylsulfonyl chloride refining operation presently used and, in one step, neutralizes and removes all the acidic by-products of chlorosulfonation simultaneously with arylsulfonamide formation which comprises the steps of (a) reacting an aryl hydrocarbon with chlorosulfonic acid to form a crude chlorosulfonation reaction product, (b) combining in an aqueous media said crude reaction product and a source of ammonia to form an amidation reaction mixture, (c) maintaining the temperature of the amidation reaction mixture at between about 40.degree. C. and 70.degree. C. and the pH at above about 7 with stirring for a period of time sufficient to form an amidation reaction product containing an arylsulfonamide, and optionally (d) separating the resulting arylsulfonamide from the amidation reaction product.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile