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Title: Isolation of levoglucosan from pyrolysis oil derived from cellulose

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. 3 figures.
Inventors:
Issue Date:
OSTI Identifier:
6892491
Assignee:
Midwest Research Institute, Kansas City, MO (United States) NREL; EDB-95-027845
Patent Number(s):
US 5371212; A
Application Number:
PPN: US 7-940849
Contract Number:
AC02-83CH10093
Resource Relation:
Patent File Date: 4 Sep 1992
Research Org:
National Renewable Energy Laboratory (NREL), Golden, CO; Midwest Research Institute
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; CELLULOSE; PYROLYSIS; PROTEINS; SYNTHESIS; CHEMICAL COMPOSITION; PYROLYTIC OILS; SEPARATION PROCESSES; CARBOHYDRATES; CHEMICAL REACTIONS; DECOMPOSITION; FUELS; OILS; ORGANIC COMPOUNDS; OTHER ORGANIC COMPOUNDS; POLYSACCHARIDES; PYROLYSIS PRODUCTS; SACCHARIDES; SYNTHETIC FUELS; THERMOCHEMICAL PROCESSES 090900* -- Biomass Fuels-- Processing-- (1990-); 099000 -- Biomass Fuels-- Products & By-Products-- (1990-)