Process for the continuous recovery of free tartaric acid from raw materials containing potassium hydrogentartrate

US7311837B2 · kind B2 · utility

Assignee

• Lurgi GmbH · DE

Inventors

• Dieter Stein
• Rudolf Bönsch · Nackenheim, DE
• Klaus Erb · Mittelbiberach, DE

Key dates

• Filing date: Feb 26, 2004
• Grant date: Dec 25, 2007
• Expiry date: Jan 26, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/42
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a process for the continuous recovery of free tartaric acid from raw materials containing potassium hydrogentartrate, the same are mixed with water and the potassium hydrogentartrate is dissolved. The process is improved in that the suspension is decanted, the clarified liquid is refiltered, the filtrate is cooled to crystallization temperature under a vacuum, the potassium hydrogentartrate crystals formed are dissolved, the solution is subjected to a cation exchange, and the tartaric acid solution obtained is evaporated.