Ethanol production with two stage continuous steam pre-treatment of lignocellulosic biomass
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United States of America Patent
Stats
-
Feb 9, 2016
Grant Date -
Jan 31, 2013
app pub date -
Jul 20, 2012
filing date -
Jul 28, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Disclosed is a method of producing ethanol from lignocellulosic biomass, including a two stage steam pretreatment process. The first stage of the steam pretreatment is carried out by heating the biomass with high pressure steam to a first stage temperature of 140° C. to 180° C. for a first stage time of 30 minutes to 2 hours at a first stage pressure of 105 to 150 psig; and the second steam pretreatment stage is carried out by heating the biomass with high pressure steam to raise the biomass temperature to a second stage temperature of 190° C. to 210° C. for a second stage time of 2 to 10 minutes at a second stage pressure of 167 to 262 psig. Hemicellulose and inhibitors (inhibitory compounds) to downstream hydrolysis and fermentation are preferably removed between the first and second pretreating stages, more preferably after each pretreatment stage.
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International Classification(s)
- 2012 Application Filing Year
- C12S Class
- 36 Applications Filed
- 1 Patents Issued To-Date
- 2.78 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- C12S Class
- 0 % 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 | Aug 9, 2027 |
