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:
Dec. 02, 1980
Filed:
Jun. 05, 1979
Werner Ostertag, Gruenstadt, DE;
Gerd Wunsch, Speyer, DE;
Volker Kiener, Weisenheim, DE;
Eckhard Hetzel, Frankenthal, DE;
Siegfried Schreiner, Ludwigshafen, DE;
Bernd Leutner, Frankenthal, DE;
Hans-Ulrich Schlimper, Speyer, DE;
Erfried Voelkl, Frankenthal, DE;
BASF Aktiengesellschaft, , DE;
Abstract
In a process for the manufacture of sodium dithionite by reacting sulfur dioxide with sodium formate and aqueous sodium hydroxide solution in the presence of methanol, an aqueous methanolic solution of sodium formate is first produced by reacting carbon monoxide with sodium hydroxide solution in an aqueous medium, containing from 1 to 50% by weight of methanol, based on the amount of water, at from 80 to 120.degree. C. under a pressure of from 10 to 40 bars. The resulting aqueous methanolic solution can be reacted directly, in the conventional manner, with sulfur dioxide and aqueous sodium hydroxide solution to give sodium dithionite.