Processes and apparatus for lignin separation in biorefineries
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United States of America Patent
Stats
-
Apr 26, 2016
Grant Date -
Jun 12, 2014
app pub date -
Oct 29, 2013
filing date -
Dec 11, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention generally provides methods of improving lignin separation during biomass fractionation with an acid to release sugars and a solvent for lignin (such as ethanol). In some embodiments, a digestor is employed to fractionating a feedstock in the presence of a solvent for lignin, sulfur dioxide, and water, to produce a liquor containing hemicellulose, cellulose-rich solids, and lignin. A solid additive is added to the digestor, wherein the solid additive combines with at least a portion of the lignin. Then a mixture of lignin and the solid additive is separated from the liquor, prior to hemicellulose recovery. Optionally, a solid additive may also be introduced to a hydrolysis reactor for converting hemicellulose oligomers to monomers, to improve separation of acid-catalyzed lignin. In some embodiments, the solid additive is gypsum or a gypsum/lignin mixture.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2013 Application Filing Year
- C07G Class
- 43 Applications Filed
- 35 Patents Issued To-Date
- 81.40 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 3 Citation Count
- C07G Class
- 30.30 % this patent is cited more than
- 9 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Oct 26, 2027 |
