Method for recovering and using lignin in adhesive resins by extracting demethylated lignin
- Ft. Collins, CO
Lignin, or a lignin derived material, which has been significantly demethylated (e.g., the demethylated lignin found in the raffinate produced as a by-product of dimethyl sulfide production which can be carried out using the spent liquor from wood pulping operations) can be isolated by a process wherein an organic solvent is added to a lignin-containing aqueous solution. The organic solvent is typically a polar, and at least a partially water-immiscible substance such as, for example, ethyl acetate. The resulting lignin-containing aqueous solution/organic solvent mixture is acidified to produce a water layer which is discarded and an organic solvent layer which contains the demethylated lignin. Upon its recovery, the demethylated lignin is preferably dried and stored until it is used (along with an alkali, an aldehyde and an adhesive filler) in compounding an adhesive of the type generally used in the manufacture of plywood.
- Assignee:
- Colorado State University Research Foundation (Ft. Collins, CO)
- Patent Number(s):
- US 5021531
- OSTI ID:
- 867852
- Country of Publication:
- United States
- Language:
- English
Similar Records
Method for recovering and using lignin in adhesive resins
Method for recovering and using lignin in adhesive resins by extracting demethylated lignin
Related Subjects
recovering
lignin
adhesive
resins
extracting
demethylated
derived
material
significantly
found
raffinate
produced
by-product
dimethyl
sulfide
production
carried
spent
liquor
wood
pulping
operations
isolated
process
organic
solvent
added
lignin-containing
aqueous
solution
typically
polar
partially
water-immiscible
substance
example
ethyl
acetate
resulting
mixture
acidified
produce
water
layer
discarded
contains
recovery
preferably
dried
stored
alkali
aldehyde
filler
compounding
type
manufacture
plywood
lignin-containing aqueous
organic solvent
aqueous solution
ethyl acetate
demethylated lignin
solvent mixture
raffinate produced
pulping operations
significantly demethylated
resulting lignin-containing
water layer
water-immiscible substance
spent liquor
solvent layer
wood pulping
lignin found
lignin derived
partially water-immiscible
adhesive resins
sulfide production
wood pulp
dimethyl sulfide
derived material
immiscible substance
extracting demethylated
partially water
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