Recovery of lignin and water soluble sugars from plant materials
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United States of America Patent
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Jul 26, 2011
Grant Date -
Jun 3, 2010
app pub date -
Dec 15, 2009
filing date -
May 8, 2006
priority date (Note) -
Expired
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Abstract
In one aspect, a process for treating woody plant material is provided, the process involving contacting the plant material with a continuous flow of an aqueous ethanol solution at elevated temperature and pressure under conditions that promote extraction of ethanol-soluble lignin from the plant material and retention of hemicellulose sugars, xylose and cellulose in the treated plant material solids. In another aspect, a process for extracting hemicellulose sugars from lignin-depleted plant material solids is provided, the process involving contacting lignin-depleted plant material with water at elevated temperature and pressure under conditions that promote extraction of hemicellulose sugars from the plant material; and recovering hemicellulose sugars from the liquid mixture.
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