TWO-LOOP DILUTE PREPROCESSING AND PRETREATMENT OF CELLULOSIC FEEDSTOCKS
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United States of America Patent
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Issued Date -
Jan 16, 2014
app pub date -
Mar 15, 2013
filing date -
Jul 13, 2012
priority date (Note) -
Abandoned
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Abstract
The present application describes a dilute two-loop method for treating biomass in the production of biofuels such as ethanol. The method involves washing the biomass to dissolve sugars that are associated with the biomass, and separating the washed biomass into a solids phase and a liquids phase. The solids phase is pretreated to render the biomass more susceptible to hydrolysis under conditions that do not produce substantial amounts of sugars. The pretreated biomass is separated into a second solids phase and second liquid phase, and the second solids phase is saccharified and fermented. The first and second liquid phases are recycled to dilute the biomass at various stages of the process.
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