Product and processes from an integrated forest biorefinery
First Claim
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1. 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.
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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.
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Citations
19 Claims
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1. A method of producing a paper product, the method comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of producing a pulp, the method comprising:
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(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. - View Dependent Claims (9, 10, 11)
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12. A method of producing a pulp, the method comprising:
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(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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification