Process for preparing 1,6-.beta.-D-anhydroglucopyranose (levoglucosan) in high purity

US5023330A · kind A · utility

Assignee

• SUEDZUCKER AG · DE

Inventors

• Michael Gander · Worms, DE
• Knut M. Rapp · Offstein, DE
• Hubert Schiweck · Worms, DE

Key dates

• Filing date: Jan 30, 1989
• Grant date: Jun 11, 1991
• Expiry date: Jan 30, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07H19/01
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process of preparing 1,6-.beta.-D-anhydroglucopyranose (levoglucosan) in high purity is described, where the starting material with a water-content, adjusted to max. 20%, is pyrolyzed, the volatile components are condensed and this distillate is neutralized. After filtration and optional treatment with an adsorbent, the mixture is chromatographically separated over an ion-exchange resin with water as eluent. Levoglucosan containing fractions are concentrated and crystalline levoglucosan is obtained by an evaporation - and/or cooling crystallization from a supersaturated water solution.