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. 09, 2000
Filed:
Oct. 01, 1998
Applicant:
Inventors:
Ingo Biertuempel, Dusseldorf, DE;
Klaus Driemel, Duisburg, DE;
Joachim Van De Flierdt, Dinslaken, DE;
Dieter MM. Rohe, Dinslaken, DE;
Assignee:
Grillo-Werke A.G., Duisburg, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562115 ; 558 39 ; 562 30 ; 562118 ; 562120 ; 562123 ;
Abstract
The process for the preparation of methanesulfonic acid by reacting sulfite ions within an aqueous system with dimethyl sulfate at an elevated temperature and adding a strong acid subsequently, wherein the molar ratio of sulfite ions to dimethyl sulfate is 1.5 to 2.5:1, preferably 2:1, and the reaction charge is maintained at said elevated temperature for at least 2 h, preferably 4 h.