Product and processes from an integrated forest biorefinery
AssigneeThe Research Foundation of State University of New York
InventorsThomas E. Amidon, Raymond Francis, Gary M. Scott, Jeremy Bartholomew, Bandaru V. Ramarao, Christopher D. Wood
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Abstract
An omnibus process of pulping and bleaching lignocellulosic materials in which a charge of a lignocellulosic material is biopulped and/or water extracted prior to pulping and bleaching. The lignocellulosic material may be mechanically pulped and bleached in the presence of an enzyme that breaks lignin-carbohydrate complexes. The aqueous extract in embodiments including a water extract step is separated into acetic acid and hemicellulose sugar aqueous solutions.
Claims19
A method of producing a paper product, the method comprising:
- (a) providing a charge of lignocellulosic material;
- (b) contacting the charge of lignocellulosic material with water, the water and charge of lignocellulosic material maintained at a temperature in the range of between about 130° C. and about 180° C. and lowering the pH to between about 3 and about 6.9 by producing acid from the reaction of the water and lignocellulosic material for a period in the range of between about 10 minutes and about 6 hours, wherein an aqueous extract and extracted lignocellulosic materials are obtained and wherein the acid comprises acetic acid;
- (c) pulping the extracted lignocellulosic materials to produce a pulp, wherein the pulp has a viscosity of greater than about 30 cP;
- (d) recovering hydrolyzate from the pulp;
- (e) contacting the pulp with at least one alkali;
- (f) mechanically refining the pulp;
- and
- (g) forming the paper product using the pulp.
A method of producing a pulp, the method comprising:
- (a) providing a charge of lignocellulosic material;
- (b) contacting the charge of lignocellulosic material with water, the water and charge of lignocellulosic material maintained at a temperature in the range of between about 130° C. and about 180° C. and lowering the pH to between about 3 and about 6.9 by producing acid from the reaction of the water and lignocellulosic material for a period in the range of between about 10 minutes and about 6 hours, wherein an aqueous extract and extracted lignocellulosic materials are obtained and wherein the acid comprises acetic acid;
- and
- (c) pulping the extracted lignocellulosic materials to produce the pulp, wherein the pulp has a viscosity of greater than about 30 cP.
A method of producing a pulp, the method comprising:
- (a) providing a charge of lignocellulosic material;
- (b) contacting the charge of lignocellulosic material with water, the water and charge of lignocellulosic material maintained at a temperature in the range of between about 130° C. and about 180° C. and lowering the pH to between about 3 and about 6.9 by producing acid from the reaction of the water and lignocellulosic material for a period in the range of between about 10 minutes and about 6 hours, wherein an aqueous extract and extracted lignocellulosic materials are obtained and wherein the acid comprises acetic acid;
- (c) pulping the extracted lignocellulosic materials to produce the pulp;
- and
- (d) refining the pulp, wherein the pulp has a viscosity of greater than about 30 cP.
Dependencies are inferred from the claim text.