Method for separating xylose from lignocelluloses rich in xylan, in particular wood
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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 α-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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Citations
32 Claims
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1-11. -11. (cancelled).
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12. A method for separating xylose from lignocelluloses rich in xylan, particularly wood, and for obtaining pulp, comprising continuous implementation of the following steps:
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(1) pretreating wood chips through mechanical destruction of the original structure by crushing and/or chopping the wood chips;
(2) impregnating the obtained wood mass with diluted mineral acid;
(3) carrying out a prehydrolysis of the obtained wood mass modified by the process under the influence of steam at a temperature of at least approximately 140°
C. for approximately 5 to 40 minutes to hydrolyze the obtained hemicelluloses; and
(4) removing the hemicelluloses from the residual pulp by filtering and/or centrifuging while obtaining an aqueous solution rich in xylose. - View Dependent Claims (14, 19, 21, 22, 25, 26, 31, 32)
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13. A method for separating xylose from lignocelluloses rich in xylan, particularly wood, and for obtaining pulp, comprising continuous implementation of the following steps:
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(1) providing comminuted vegetable materials, particularly straw and bagasse;
(2) impregnating the comminuted vegetable materials with diluted mineral acid;
(3) carrying out a prehydrolysis of the comminuted vegetable materials modified by the process under the influence of steam at a temperature of at least approximately 140°
C. for approximately 5 to 40 minutes to hydrolyze the obtained hemicelluloses; and
(4) removing the hemicelluloses from the residual pulp by filtering and/or centrifuging while obtaining an aqueous solution rich in xylose. - View Dependent Claims (15, 16, 17, 18, 20, 23, 24, 27, 28, 29, 30)
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Specification