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Isolation of levoglucosan from pyrolysis oil derived from cellulose

Patent ·
OSTI ID:869636
 [1]
  1. Lakewood, CO
+ Show Author Affiliations

High purity levoglucosan is obtained from pyrolysis oil derived from cellulose by: mixing pyrolysis oil with water and a basic metal hydroxide, oxide, or salt in amount sufficient to elevate pH values to a range of from about 12 to about 12.5, and adding an amount of the hydroxide, oxide, or salt in excess of the amount needed to obtain the pH range until colored materials of impurities from the oil are removed and a slurry is formed; drying the slurry azeotropically with methyl isobutyl ketone solvent to form a residue, and further drying the residue by evaporation; reducing the residue into a powder; continuously extracting the powder residue with ethyl acetate to provide a levoglucosan-rich extract; and concentrating the extract by removing ethyl acetate to provide crystalline levoglucosan. Preferably, Ca(OH).sub.2 is added to adjust the pH to the elevated values, and then Ca(OH).sub.2 is added in an excess amount needed.

Research Organization:
MIDWEST RESEARCH INSTITUTE
DOE Contract Number:
AC02-83CH10093
Assignee:
Midwest Research Institute (Kansas City, MO)
Patent Number(s):
US 5371212
OSTI ID:
869636
Country of Publication:
United States
Language:
English

References (1)

Praktische darstellung von 1,6-anhydro-β-d-glucopyranose durch vakuumpyrolyse von Stärke. Kriterien für den bau eines stahlreaktors journal March 1988

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/999/
12
acetate
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adding
adjust
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azeotropically
basic
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cellulose
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concentrating
continuously
crystalline
derived
drying
elevate
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ethyl
ethyl acetate
evaporation
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isobutyl
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methyl
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ph
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powder
preferably
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pyrolysis
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