Alkali metal dithionite manufacture

US3947559A · kind A · utility

Inventors

• Geoffrey Moorhouse Gibson
• John V. Crowder

Key dates

• Filing date: Mar 29, 1974
• Grant date: Mar 30, 1976
• Expiry date: Mar 29, 1994

Classification

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

Abstract

A process for making an alkali metal dithionite by reacting sulphur dioxide with a basic alkali metal compound and one or both of formic acid and an alkali metal formate. The process is conducted in the presence of aqueous 2-methoxyethanol.