Isolation of levoglucosan from lignocellulosic pyrolysis oil derived from wood or waste newsprint

Patent · Sun Jan 01 00:00:00 EST 1995

OSTI ID:869974

Moens, Luc ^[1]

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1. Lakewood, CO

A method is provided for preparing high purity levoglucosan from lignocellulosic pyrolysis oils derived from wood or waste newsprint. The method includes reducing wood or newsprint to fine particle sizes, treating the particles with a hot mineral acid for a predetermined period of time, and filtering off and drying resulting solid wood or newsprint material; pyrolyzing the dried solid wood or newsprint material at temperatures between about 350.degree. and 375.degree. C. to produce pyrolysis oils; treating the oils to liquid-liquid extraction with methyl isobutyl ketone to remove heavy tar materials from the oils, and to provide an aqueous fraction mixture of the oils containing primarily levoglucosan; treating the aqueous fraction mixtures with a basic metal salt in an amount sufficient to elevate pH values to a range of about 12 to about 12.5 and adding an amount of the salt in excess of the amount needed to obtain the pH range to remove colored materials of impurities from the oil and form a slurry, and freeze-drying the resulting slurry to produce a dry solid residue; and extracting the levoglucosan from the residue using ethyl acetate solvent to produce a purified crystalline levoglucosan.

• Research Organization: Midwest Research Institute, Kansas City, MO (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-83CH10093
• Assignee: Midwest Research Institute (Kansas City, MO)
• Patent Number(s): US 5432276
• OSTI ID: 869974
• Country of Publication: United States
• Language: English

Related Subjects

isolation
levoglucosan
lignocellulosic
pyrolysis
oil
derived
wood
waste
newsprint
method
provided
preparing
purity
oils
reducing
fine
particle
sizes
treating
particles
hot
mineral
acid
predetermined
period
time
filtering
drying
resulting
solid
material
pyrolyzing
dried
temperatures
350
degree
375
produce
liquid-liquid
extraction
methyl
isobutyl
ketone
remove
heavy
tar
materials
provide
aqueous
fraction
mixture
containing
primarily
mixtures
basic
metal
salt
amount
sufficient
elevate
ph
values
range
12
adding
excess
obtain
colored
impurities
form
slurry
freeze-drying
dry
residue
extracting
ethyl
acetate
solvent
purified
crystalline
mineral acid
ph range
pyrolysis oils
dry solid
pyrolysis oil
particle size
metal salt
amount sufficient
solid residue
ph value
ethyl acetate
predetermined period
particle sizes
ph values
remove heavy
basic metal
isobutyl ketone
oils containing
oil derived
methyl isobutyl
resulting slurry
resulting solid
fine particle
liquid extract
purity levoglucosan
waste newsprint
liquid extraction
aqueous fraction
lignocellulosic pyrolysis
liquid-liquid extraction
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