Method for producing pulp and lignin

a technology of lignin and pulp, which is applied in the field of methods for producing pulp and lignin, can solve the problems of loss of cellulose, adversely affecting yield, and destruction of a large amount of natural form lignin from wood chips
US20040244925A1Inactive Publication Date: 2004-12-09PACIFIC PULP RESOURCES
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
PACIFIC PULP RESOURCES
Publication Date
2004-12-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides for methods for producing pulp (comprising cellulose) and lignin from lignocellulosic material, such as wood chips. The methods involve acid catalyzed hydrolysis. Lignocellulosic material having a relatively high moisture concentration can be used as the starting material. The lignocellulosic material is impregnated with an acid (preferably nitric acid) and heated. During the heating lignin is depolymerized at relatively low temperatures, and the acid catalyst is distilled off. The acid catalyst can be collected and recycled after impregnation and heating. The lignocellulosic material is then digested in an alkaline solution under heat, dissolving the lignin and allowing the pulp to be removed. Acid is added to the black liquor to precipitate the lignin which is then removed. The resultant amber liquor can be further processed into other ancillary products such as alcohols and / or unicellular proteins.
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Description

REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Application No. 60 / 474,961, filed Jun. 3, 2003, and U.S. Provisional Application No. ______ unassigned, filed Oct. 6, 2003.

[0002] This invention pertains to a method for producing pulp (comprising cellulose) and lignin from lignocellulosic material such as wood chips.

[0003] Wood is a composite material comprising cellulose, lignin and hemicellulose.

[0004] Cellulose is the strong, fibrous component which consists of long chains of glucose molecules and which is used to make paper. Lignin is a phenolic polymeric matrix which holds the cellulose fibres together. Hemicellulose is the component comprised of short, branched chains of glucose and other like molecules.

[0005] In general terms, pulping processes involve converting wood chips (or other suitable vegetative material) into a fibrous form in order to produce pulp. Pulp refers to cellulose fibres or material containing cellulose fibres w...

Claims

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