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. 26, 1992
Filed:
Oct. 15, 1991
Applicant:
Inventor:
Stanley R Sandler, Springfield, PA (US);
Assignee:
Atochem North America, Inc., Philadelphia, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562101 ; 562123 ;
Abstract
Alkanedisulfonic acids, particularly methanedisulfonic acid (methionic acid), can be prepared by reacting the corresponding alkanesulfonic acid with chlorosulfonic acid. The reaction is carried out by heating the reactants with agitation, preferably under substantially anhydrous conditions in the presence of oxygen and at substantially atmospheric pressure. Particularly good yields are obtained using an activated carbon co-catalyst.