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Method for producing pulp and lignin

a technology of lignin and pulp, which is applied in the field of pulp production, can solve the problems of affecting the yield of pulp liquor, destroying much of the natural form lignin of wood chips, and loss of some cellulos

Inactive Publication Date: 2006-08-03
PACIFIC PULP RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides methods for producing pulp and lignin from lignocellulosic material. The methods involve impregnating the material with an aqueous acid solution, heating the material in stages to depolymerize the lignin without degrading the cellulose, and then removing the lignin by precipitation. The resulting pulp can then be further processed for various applications. The methods provide efficient and effective means for producing these valuable byproducts from lignocellulosic material.

Problems solved by technology

One disadvantage with Kraft pulping is that it is carried out under extreme conditions which adversely affect yields.
These harsh conditions result in a loss of some cellulose and the destruction of much of natural form lignin from the wood chips.
Lignin typically is not recovered as an end-product in typical Kraft pulping processes.

Method used

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  • Method for producing pulp and lignin
  • Method for producing pulp and lignin
  • Method for producing pulp and lignin

Examples

Experimental program
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example 2

[0099] This example comprised a trial that was similar to Trials 1-19 in example 1 except that the starting lignocellulosic material was 150 grams of shavings and sawdust from Hemlock, Oak and Pine tree species. Impregnation was done for 30 minutes in 15% (w / w) HNO3 solution under heat of 50° C. The impregnated shavings and sawdust were heated for 60 minutes between 50-75° C., and then for 10 minutes over 80° C. Following the heating step, the shavings and sawdust were contacted with an alkaline solution having 1.25 moles of NaOH and 2600 mL total volume at a temperature of 52° C. for 7 minutes. Following pulp removal, lignin was precipitated with the addition of 20% (v / v) H2S04. The pulp and lignin were not weighed, but a visual inspection showed satisfactory appearance and yield for each, proving that the method of this invention can be carried out with relatively small pieces of lignocellulosic material such as shavings and sawdust.

example 3

[0100] The pulp samples produced in Trials 5, 7 and 2 from example 1 were subsequently analyzed to determine the relative amounts of alpha cellulose, beta cellulose and gamma cellulose therein. The results are found in Table 6 below.

TABLE 6Trial 5Trial 7Trial 2Alpha Cellulose (%)81.379.679.2Beta Cellulose (%)4.43.77.5Gamma Cellulose (%)14.316.713.3

[0101] In addition to the methods herein, the present invention also includes pulp produced according to the methods herein, as well as paper products comprising cellulose from pulp produced according to the methods herein. Similarly, the present invention also includes lignin produced according to the methods herein, as well as numerous other products and compositions comprising lignin produced according to the methods herein, including for example, fertilizers, asphalt emulsifiers, soil stabilizers, wood products (such as plywood and particle board), oil well drilling fluids and dispersing agents for preparing concrete.

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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.

Description

REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of application Ser. No. 10 / 728,976, filed Dec. 8, 2003, which is hereby incorporated by reference, and claims the benefit of U.S. Provisional Application No. 60 / 474,961, filed Jun. 3, 2003, and U.S. Provisional Application No. 60 / 508,308, filed Oct. 6, 2003.TECHNICAL FIELD [0002] This invention pertains to a method for producing pulp (comprising cellulose) and lignin from lignocellulosic material such as wood chips. BACKGROUND [0003] Wood is a composite material comprising cellulose, lignin and hemicellulose. 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. [0004] In general terms, pulping processes involve converting wood chips (or other suitable ve...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21C3/26D21C11/00D21C3/02D21C1/04D21C11/04
CPCD21C1/04D21C3/02D21C11/04
Inventor TARASENKO, DAVID
Owner PACIFIC PULP RESOURCES
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