Process for production of sugars and optionally cellulose and lignin from lignocellulosic raw materials
First Claim
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1. A process for treating vegetable material essentially comprised of cellulose, lignin and hemicelluloses, comprising the steps of:
- (a) treating said vegetable material under elevated pressure with a first solution comprising (i) water and acetone in a volume ratio between about 70;
30 and 30;
70, and (ii) at least one acid, said acid having a concentration, relative to the total volume of said first solution, of between about 0.001 and about 1N, at a temperature between about 170° and
about 220°
C., such that substantially all of said lignin and said hemicelluloses are dissolved in said first solution and a residue comprising microcrystalline cellulose is formed;
(b) separating said residue from said first solution; and
(c) after step (b), treating said residue with a second solution comprising (i) water and acetone in a volume ratio between about 70;
30 and 30;
70, and (ii) at least one acid, said acid having a concentration, relative to the total volume of said first solution, of between about 0.001 and about 1N, at a temperature between about 170° and
about 220°
C., such that said microcrystalline cellulose is substantially completely hydrolyzed to glucose, said glucose being dissolved in said second solution.
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Abstract
A process for the production of sugars, and optionally cellulose and lignin, from lignocellulosic vegetable materials which comprises subjecting the vegetable materials to a chemical pretreatment with a mixture of water and lower aliphatic alcohols and/or ketones at a temperature from 100° to 190° C. for a period of from 4 hours to 2 minutes with control of the breakdown of the hemicellulose components followed by separation of residue and a subsequent main chemical treatment with a similar solvent mixture at elevated temperatures for a further period of from 6 hours to 2 minutes.
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11 Claims
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1. A process for treating vegetable material essentially comprised of cellulose, lignin and hemicelluloses, comprising the steps of:
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(a) treating said vegetable material under elevated pressure with a first solution comprising (i) water and acetone in a volume ratio between about 70;
30 and 30;
70, and (ii) at least one acid, said acid having a concentration, relative to the total volume of said first solution, of between about 0.001 and about 1N, at a temperature between about 170° and
about 220°
C., such that substantially all of said lignin and said hemicelluloses are dissolved in said first solution and a residue comprising microcrystalline cellulose is formed;(b) separating said residue from said first solution; and (c) after step (b), treating said residue with a second solution comprising (i) water and acetone in a volume ratio between about 70;
30 and 30;
70, and (ii) at least one acid, said acid having a concentration, relative to the total volume of said first solution, of between about 0.001 and about 1N, at a temperature between about 170° and
about 220°
C., such that said microcrystalline cellulose is substantially completely hydrolyzed to glucose, said glucose being dissolved in said second solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification