Methods for removing hemicellulose
First Claim
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1. A method for treating a cellulosic material, comprising:
- extracting the cellulosic material with an extractant to selectively extract hemicellulose, wherein the extractant comprises an ionic liquid and a non-solvent; and
separating the extracted hemicellulose from the cellulosic material to form a cellulosic product comprising less hemicellulose than the cellulosic material;
wherein less than 15% of the cellulose in the cellulosic material is extracted.
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Abstract
A method for treating a cellulosic material comprising extracting the cellulosic material with an extractant to selectively extract hemicellulose therein and separating the extracted hemicellulose to form a cellulosic product comprising less hemicellulose than the cellulosic material. The extractant comprises an amine oxide and a non-solvent. The cellulosic product retains the cellulosic fiber morphology.
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44 Claims
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1. A method for treating a cellulosic material, comprising:
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extracting the cellulosic material with an extractant to selectively extract hemicellulose, wherein the extractant comprises an ionic liquid and a non-solvent; and separating the extracted hemicellulose from the cellulosic material to form a cellulosic product comprising less hemicellulose than the cellulosic material; wherein less than 15% of the cellulose in the cellulosic material is extracted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for producing high purity α
- -cellulose grade pulp, comprising;
extracting hemicellulose from a wood pulp by treating the wood pulp with an extractant comprising an ionic liquid and a non-solvent to form an intermediate wood pulp that retains a cellulosic fiber morphology; treating the intermediate wood pulp with an enzyme to hydrolyze hemicellulose contained therein and forming a reduced hemicellulose wood pulp; and washing the reduced hemicellulose wood pulp with a wash solution to form the high purity α
-cellulose grade pulp;wherein less than 15% of the cellulose in the cellulosic material is extracted. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
- -cellulose grade pulp, comprising;
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39. A high purity α
- -cellulose grade pulp product purified by removing hemicellulose from cellulosic material using a mixture of ionic liquid, water and enzyme, wherein the high purity α
-cellulose grade pulp product comprises less than 5% hemicellulose; and
wherein less than 15% of the cellulose in the cellulosic material is removed. - View Dependent Claims (40, 41, 42, 43, 44)
- -cellulose grade pulp product purified by removing hemicellulose from cellulosic material using a mixture of ionic liquid, water and enzyme, wherein the high purity α
Specification