Process for the preparation of methanesulfonic acid

US6060621A · kind A · utility

Assignee

• Grillo-Werke AG · DE

Inventors

• Ingo Biertuempel · Düsseldorf, DE
• Klaus Driemel · Duisburg, DE
• Joachim Van De Flierdt · Dinslaken, DE
• Dieter Rohe · Dinslaken, DE

Key dates

• Filing date: Oct 1, 1998
• Grant date: May 9, 2000
• Expiry date: Oct 1, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C303/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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.