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High-value utilization method of lignin in black liquor

A lignin and high-value technology, which is applied in the field of high-value lignin utilization in black liquor, can solve the problems of low recycling rate and complex structure, and achieve the effect of less equipment, high purity and expanded application range

Inactive Publication Date: 2019-12-06
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the existing problems of complex lignin structure and low recycling rate, the purpose of the present invention is to provide a high-value utilization method of lignin in black liquor, by adding acid to adjust the pH value of the system step by step, so that the lignin can be precipitated by stages to obtain Lignin samples with relatively uniform molecular weight distribution; and hydrophobic modification of lignin samples to expand its application range

Method used

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  • High-value utilization method of lignin in black liquor
  • High-value utilization method of lignin in black liquor
  • High-value utilization method of lignin in black liquor

Examples

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Embodiment 1

[0029] (1) Take 100ml of the above black liquor sample, filter it with filter paper to remove solid impurities, add 900ml of distilled water to dilute to obtain a dilution;

[0030] (2) At room temperature, add 2mol / L sulfuric acid to the diluent under stirring condition, adjust the pH value of the diluent to 6 and precipitate precipitates, continue stirring at room temperature for 30min, stirring speed 500rpm, centrifuge after stirring (3000r / min , 15min) to obtain the primary precipitate and the primary supernatant; continue to add 2mol / L sulfuric acid to the primary supernatant under stirring conditions, adjust the pH value to 4 and precipitate the precipitate at the same time, and obtain the secondary precipitate and Secondary supernatant; continue to add 2mol / L sulfuric acid to the secondary supernatant under stirring conditions, adjust the liquid pH value to 2 and precipitate precipitates at the same time, and obtain third-grade precipitates and third-grade supernatants t...

Embodiment 2

[0037] (1) Take 100ml of the above black liquor sample, filter it with filter paper to remove the solid impurities in it, add 800ml of distilled water to dilute to obtain the diluent;

[0038] (2) At room temperature, add 3mol / L sulfuric acid to the diluent under stirring condition, adjust the pH value of the diluent to 6 and precipitate precipitates at the same time, continue stirring at room temperature for 30min at a stirring speed of 500rpm, centrifuge after the stirring is completed (4000r / min , 10min) to obtain the primary precipitate and the primary supernatant; continue to add 3mol / L sulfuric acid to the primary supernatant under stirring conditions, adjust the pH value to 4 and precipitate the precipitate at the same time, and obtain the secondary precipitate and Secondary supernatant; continue to add 3mol / L sulfuric acid to the secondary supernatant under stirring conditions, adjust the liquid pH value to 2 and precipitate precipitates at the same time, and obtain ter...

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Abstract

The present invention discloses a high-value utilization method of lignin in black liquor. The pH value of the black liquor is regulated step by step by using dilute acid such as sulfuric acid and thelike, so that lignin is graded and precipitated; and the obtained lignin is purified by using an ethanol / water mixed solution, so that the obtained lignin has high purity and uniform molecular weightdistribution. Through the step-by-step precipitation, the lignin can be effectively classified based on the molecular size, and further development and utilization of lignin samples are facilitated.Hydrophobic modification treatment is carried out on the lignin sample through an acetylation reaction, and then dissolution performance of lignin in an organic solvent-water mixed system can be changed, so that the lignin can be used as a raw material to prepare novel materials such as drug release controlling agents, nano adsorption materials and the like, and thus the application range of lignin is expanded. The method provided by the invention has the advantages of low cost investment, low drug toxicity, less required equipment, simple operation method and easy realization of large-scale production and application.

Description

technical field [0001] The invention belongs to the technical field of lignin recovery and reuse, and in particular relates to a method for high-value utilization of lignin in black liquor. Background technique [0002] Lignin is a kind of amorphous high molecular polymer with a high relative molecular weight and a network structure that is difficult to hydrolyze under the action of acid. It has a complex structure and uneven relative molecular weight. Its chemical structure is composed of phenylpropane structural units. There are three basic structures (non-condensed structures), namely, guaiac-based structure, syringyl-based structure and p-hydroxyphenyl-based structure. In the pulp and paper industry, the black liquor produced in the cooking section contains nearly 90% of the pollutants in the pulp and paper making process, including a large number of degradation products, such as lignin and hemicellulose, which is a kind of high alkalinity, high COD, high wood quality c...

Claims

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Application Information

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IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 房桂干严振宇邓拥军沈葵忠
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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