Process for the recovery of hemicelluloses from lignocellulosic material
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United States of America Patent
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Issued Date -
Jun 15, 2006
app pub date -
Dec 13, 2005
filing date -
Dec 15, 2004
priority date (Note) -
Abandoned
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Abstract
A process of recovering hemicellulose from lignocellulosic material (e.g., oat husks) is described. The process involves: (a) contacting lignocellulose with an aqueous alkaline solution, thereby forming an alkaline extract; and (b) contacting the alkaline extract with a precipitation bath that includes water and an organic liquid A which is miscible with water, thereby forming a precipitate comprising hemicellulose. In the method of the present invention: (i) the alkaline extract is not neutralised prior to contact with the precipitation bath; and (ii) after completion of precipitation step-(b) the precipitation bath includes organic liquid A in an amount of from 25 wt. % to 70 wt. %, based on the weight of the precipitation bath.
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