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Method for preparing lignin nanoparticles by taking papermaking black liquid as raw material

A paper-making black liquor and nano-particle technology, which is applied in the field of lignin nano-particle preparation, can solve the problems of difficult to obtain, expensive ionic liquid, difficult to promote the application of nano-lignin, etc., to achieve easy to obtain, avoid oxidation, and good adsorption performance Effect

Inactive Publication Date: 2013-09-04
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using ionic liquids as solvents can effectively shield the self-polymerization of phenolic hydroxyl groups of lignin during the treatment process, but ionic liquids are expensive and not easy to obtain, so it is difficult to promote the application of nano-lignins

Method used

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  • Method for preparing lignin nanoparticles by taking papermaking black liquid as raw material
  • Method for preparing lignin nanoparticles by taking papermaking black liquid as raw material
  • Method for preparing lignin nanoparticles by taking papermaking black liquid as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of alkali lignin from papermaking black liquor:

[0034] (a) Take 100 parts of papermaking black liquor from Pumiao Paper Mill, heat it in a water bath to 50°C, add 10% sulfuric acid to pH=2.2~3.0 while stirring, and precipitate a large amount of alkali lignin, filter it, and rinse it repeatedly with distilled water until medium properties, dried under vacuum at 65°C for 12 hours, and ground to obtain soda ash lignin;

[0035] (b) Take 100 parts of papermaking black liquor and perform ultrafiltration with an ultrafiltration device. The molecular weight cut-off of the ultrafiltration membrane is 2,000 and 50,000 to remove a large amount of inorganic salts and low molecular weight organic substances in the black liquor. The obtained filtrate is heated at 65°C Dry under vacuum for 12 hours, and grind to obtain soda ash lignin.

[0036] (2) Preparation of lignin colloid:

[0037](a) Take 50 parts of the alkali lignin obtained in the above step (1), add 375...

Embodiment 2

[0042] (1) Preparation of alkali lignin from papermaking black liquor:

[0043] (a) Take 100 parts of papermaking black liquor from Pumiao Paper Mill, heat it in a water bath to 60°C, add 10% sulfuric acid to pH=2.2~2.8 while stirring, and precipitate a large amount of alkali lignin, filter it, and rinse it repeatedly with distilled water until medium properties, dried under vacuum at 70°C for 11 hours, and ground to obtain soda ash lignin;

[0044] (b) Take 100 parts of papermaking black liquor and perform ultrafiltration with an ultrafiltration device. The molecular weight cut-off of the ultrafiltration membrane is 2,000 and 50,000 to remove a large amount of inorganic salts and low-molecular-weight organic substances in the black liquor. Dry under vacuum for 13 hours, and grind to obtain soda ash lignin.

[0045] (2) Preparation of lignin colloid:

[0046] (a) Take 50 parts of the alkali lignin obtained in the above step (1), add 400 parts of distilled water, keep stirrin...

Embodiment 3

[0051] (1) Preparation of alkali lignin from papermaking black liquor:

[0052] (a) Take 100 parts of papermaking black liquor from Pumiao Paper Mill, heat it in a water bath to 55°C, add 10% sulfuric acid to pH=2.2~3.0 while stirring, and precipitate a large amount of alkali lignin, filter it, and rinse it repeatedly with distilled water until medium properties, dried under vacuum at 60°C for 13 hours, and ground to obtain soda ash lignin;

[0053] (b) Take 100 parts of papermaking black liquor and perform ultrafiltration with an ultrafiltration device. The molecular weight cut-off of the ultrafiltration membrane is 2,000 and 50,000 to remove a large amount of inorganic salts and low-molecular-weight organic substances in the black liquor. Dry under vacuum for 11 hours, and grind to obtain soda ash lignin.

[0054] (2) Preparation of lignin colloid:

[0055] (a) Take 50 parts of the alkali lignin obtained in the above step (1), add 350 parts of distilled water, keep stirrin...

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Abstract

The invention discloses a method for preparing lignin nanoparticles by taking papermaking black liquid as a raw material and belongs to the field of nanometer material chemistry. The preparation method comprises the following steps of: carrying out acidification or ultra-filtration purification on the papermaking black liquid taken as the raw material so as to remove insoluble impurities and a lower molecular compound; dissolving purified lignin in an alkaline solution; adding sulfuric acid, nitric acid or hydrochloric acid at a certain speed so as to form lignin colloid; and carrying out freeze drying to obtain the lignin nanoparticles, wherein the particle sizes of the lignin nanoparticles are in the range being 50-280 nm. The obtained lignin nanoparticles have good dispersion property and absorption property and are expected to be applied to a dispersing agent for wastewater treatment and systems such as dyes, pesticides and coal-water slurry. The preparation method disclosed by the invention is simple and practicable and has good application prospect; and a solvent used in the method is water which has no negative effect on environments.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of papermaking black liquor, in particular to a method for preparing lignin nanoparticles using papermaking black liquor as a raw material. Background technique [0002] Wastewater pollution from my country's papermaking industry has become a key factor for the survival and development of papermaking and related industries. According to statistics, in 2000, the discharge of industrial wastewater from papermaking and paper products above the county level in my country was 3.53 billion tons, accounting for 90% of the total discharge of industrial wastewater in the country. 18.6%, COD in discharged wastewater Cr It was 2.877 million tons, accounting for about 44.0% of the total national industrial emissions. The pollution of papermaking is mainly black liquor, which accounts for about 90% of the total pollutants in papermaking wastewater. Lignin and its degradation products are the most impo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
Inventor 李志礼葛圆圆肖多
Owner GUANGXI UNIV
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