Aqueous fractionation of biomass based on novel carbohydrate hydrolysis kinetics
- Littleton, CO
A multi-function process for hydrolysis and fractionation of lignocellulosic biomass to separate hemicellulosic sugars from other biomass components comprising extractives and proteins; a portion of a solubilized lignin; cellulose; glucose derived from cellulose; and insoluble lignin from said biomass comprising: a) introducing either solid fresh biomass or partially fractioned lignocellulosic biomass material with entrained acid or water into a reactor and heating to a temperature of up to about 185.degree. C.-205.degree. C. b) allowing the reaction to proceed to a point where about 60% of the hemicellulose has been hydrolyzed in the case of water or complete dissolution in case of acid; c) adding a dilute acid liquid at a pH below about 5 at a temperature of up to about 205.degree. C. for a period ranging from about 5 to about 10 minutes; to hydrolyze the remaining 40% of hemicellulose if water is used. d) quenching the reaction at a temperature of up to about 140.degree. C. to quench all degradation and hydrolysis reactions; and e) introducing into said reaction chamber and simultaneously removing from said reaction chamber, a volumetric flow rate of dilute acid at a temperature of up to about 140.degree. C. to wash out the majority of the solubilized biomass components, to obtain improved hemicellosic sugar yields.
- Research Organization:
- Midwest Research Institute
- Assignee:
- Midwest Research Institute (Kansas City, MO)
- Patent Number(s):
- US 6228177
- OSTI ID:
- 873707
- Country of Publication:
- United States
- Language:
- English
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10
140
185
205
40
60
acid
acid liquid
adding
allowing
aqueous
aqueous fraction
based
below
biomass
biomass components
biomass comprising
biomass material
carbohydrate
cellulose
cellulosic sugars
chamber
complete
components
components comprising
comprising
degradation
degree
derived
dilute
dilute acid
dissolution
entrained
extractives
flow
flow rate
fractionation
fractioned
fresh
glucose
heating
hemicellosic
hemicellulose
hemicellulosic
hemicellulosic sugars
hydrolysis
hydrolyze
hydrolyzed
improved
insoluble
introducing
kinetics
lignin
lignocellulosic
lignocellulosic biomass
liquid
majority
material
minutes
multi-function
multi-function process
novel
obtain
obtain improved
partially
period
ph
portion
proceed
process
proteins
quench
quenching
ranging
rate
reaction
reaction chamber
reactions
reactor
remaining
removing
separate
separate hemicellulosic
simultaneously
simultaneously removing
solid
solubilized
sugar
sugars
temperature
volumetric
volumetric flow
wash
water
yields