Manufacture of sodium dithionite

US4017593A · kind A · utility

Assignee

• BASF SE

Inventors

• Erfried Voelkl
• Siegfried Schreiner · Ludwigshafen, DE
• Gerd Wunsch · Speyer, DE
• Volker Kiener · Bad Dürkheim, DE
• Rudi Waibel · Niederstotzingen, DE
• Hartwig Koester

Key dates

• Filing date: Aug 12, 1975
• Grant date: Apr 12, 1977
• Expiry date: Aug 12, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B17/66
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

For the preparation of anhydrous sodium dithionite by the reaction of sulfur dioxide with sodium formate and caustic soda in the presence of organic solvents, sulfur dioxide is passed, together with the formate, into a liquid containing all of the caustic soda required for the reaction. This initial liquid may contain, in addition to the caustic soda, a portion of the sulfur dioxide or formate required for the reaction.