Method of treating biomass material
First Claim
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1. A method of hydrolyzing lignocellulosic material containing hemicellulose, cellulose and lignin which comprises the following steps:
- (a) subjecting such material to a first stage hydrolysis step in an aqueous medium and in comminuted form at a temperature and a pressure chosen to effect primarily depolymerization of hemicellulose without major depolymerization of cellulose to glucose, such step resulting in a slurry in which the liquid aqueous phase contains dissolved monosaccharides resulting from depolymerization of hemicellulose and a solid phase containing cellulose and lignin(b) separating from the product of step (a) at least a portion of such liquid aqueous phase(c) also separating from the product of step (a) the solid phase and subjecting it to attrition(d) subjecting the separated solid phase which has been subjected to attrition in step (c), in the form of an aqueous slurry, to a second stage hydrolysis step under conditions such that at least a major portion of the cellulose is depolymerized, such step resulting in a liquid aqueous phase containing dissolved therein the soluble depolymerization products of cellulose, such conditions being chosen to minimize the degradation of the depolymerization products of cellulose(e) separating from the product of step (d) at least a major portion of such liquid aqueous phase and(f) also separating from such product the undissolved solids(g) the various steps (a) through (f) being carried out under conditions to minimize the loss of heat from the system and to minimize the times of exposure of solutions resulting from steps (a) and (d) to elevated temperature.
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Abstract
Two stage hydrolysis of lignocellulosic material, conditions during the first stage being such as to hydrolyze or depolymerize the hemicellulosic component without substantial degradation of resulting monosaccharides, conditions during the second stage being such as to hydrolyze the cellulose to glucose without substantial degradation of the glucose. The solids left after first stage hydrolysis are disintegrated mechanically thereby greatly facilitating second stage hydrolysis. Hydrolysis in both stages is preferably accomplished by the use of nitric acid. The pH retention time and temperature in both stages are selected to maximize production of the desired monosaccharide or monosaccharides.
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Citations
2 Claims
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1. A method of hydrolyzing lignocellulosic material containing hemicellulose, cellulose and lignin which comprises the following steps:
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(a) subjecting such material to a first stage hydrolysis step in an aqueous medium and in comminuted form at a temperature and a pressure chosen to effect primarily depolymerization of hemicellulose without major depolymerization of cellulose to glucose, such step resulting in a slurry in which the liquid aqueous phase contains dissolved monosaccharides resulting from depolymerization of hemicellulose and a solid phase containing cellulose and lignin (b) separating from the product of step (a) at least a portion of such liquid aqueous phase (c) also separating from the product of step (a) the solid phase and subjecting it to attrition (d) subjecting the separated solid phase which has been subjected to attrition in step (c), in the form of an aqueous slurry, to a second stage hydrolysis step under conditions such that at least a major portion of the cellulose is depolymerized, such step resulting in a liquid aqueous phase containing dissolved therein the soluble depolymerization products of cellulose, such conditions being chosen to minimize the degradation of the depolymerization products of cellulose (e) separating from the product of step (d) at least a major portion of such liquid aqueous phase and (f) also separating from such product the undissolved solids (g) the various steps (a) through (f) being carried out under conditions to minimize the loss of heat from the system and to minimize the times of exposure of solutions resulting from steps (a) and (d) to elevated temperature. - View Dependent Claims (2)
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Current AssigneeDavid L. Brink
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Original AssigneeDavid L. Brink
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InventorsBrink, David L.
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Primary Examiner(s)Lieberman, Paul
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Assistant Examiner(s)Hailey, Patricia
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Application NumberUS08/254,168Time in Patent Office771 DaysField of Search127/43, 127/37, 162/25, 162/81US Class Current127/43CPC Class CodesB02C 13/18 with beaters rigidly connec...C13K 1/02 obtained by saccharificatio...C13K 1/04 PurifyingY02E 50/30 Fuel from waste, e.g. synth...
