Method for separating xylose from lignocelluloses rich in xylan, in particular wood
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United States of America Patent
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Issued Date -
Mar 24, 2005
app pub date -
Nov 10, 2004
filing date -
Nov 27, 2001
priority date (Note) -
Abandoned
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Abstract
The invention is directed to a method for separating xylose from lignocelluloses rich in xylan, particularly wood, and for obtaining pulp, characterized by the following steps: (1) pretreating wood chips through mechanical destruction of the original structure; (2) impregnating the obtained wood mass with diluted mineral acid; (3) carrying out prehydrolysis of the obtained wood mass modified by the process under the influence of steam at an elevated temperature to hydrolyze the obtained hemicelluloses; and (4) removing the hemicelluloses from the residual pulp by washing, filtering and/or centrifuging while obtaining an aqueous solution rich in xylose. The combination of method steps according to the invention makes it possible to achieve high .alpha.-cellulose contents with very low proportions of xylose, that is, highly pure chemical pulp qualities, while at the same time enabling a virtually quantitative separation of the valuable xylose.
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