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:
Nov. 09, 1982
Filed:
Sep. 08, 1981
Walter R Demler, Hamburg, NY (US);
David M Todoroff, Hamburg, NY (US);
Buffalo Color Corporation, West Paterson, NJ (US);
Abstract
A process for the preparation of meta sulfobenzoic acid wherein after solution sulfonation of benzoic acid, meta sulfobenzoic alkali metal salt is precipitated by treating the solution with an alkali metal salt at a temperature below about 120.degree. C. The precipitate is then filtered from the solution and rinsed at least once with a cold rinse solution containing from 3 to 10 percent of an alkali metal salt The resulting product has a lower concentration of alkali metal salt, usually sodium chloride, than was obtained using prior art methods. The product is especially suitable for use in a process to manufacture m-hydroxy benzoic acid.