Process for preparing 1,6-.beta.-D-anhydroglucopyranose (levoglucosan) in high purity
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United States of America Patent
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Jun 11, 1991
Grant Date -
N/A
app pub date -
Jan 30, 1989
filing date -
Feb 4, 1988
priority date (Note) -
Expired
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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.
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