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Method for extracting fulvic acid from straw pulp black liquor

A technology of straw pulp black liquor and fulvic acid, which is applied in the field of straw pulp black liquor treatment, can solve problems such as difficult to handle, difficult to decolorize, consume dissolved oxygen, etc., achieve the effect of high price, omit the fermentation process, and improve quality

Active Publication Date: 2009-07-22
SHANDONG TRALIN PAPER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CODcr is generally around 100,000-180,000mg / L, pH value is 10-13, CODcr exceeds 50 times of the discharge standard, due to the difficulty of decolorization and the serious consumption of dissolved oxygen when discharged into the water body, it is difficult to deal with by general methods

Method used

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  • Method for extracting fulvic acid from straw pulp black liquor
  • Method for extracting fulvic acid from straw pulp black liquor
  • Method for extracting fulvic acid from straw pulp black liquor

Examples

Experimental program
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Embodiment 1

[0038] Mix the black liquor of ammonium method grass pulp and the black liquor of alkali method straw pulp at a volume ratio of 1:100 to obtain mixed straw pulp black liquor; 7; Alkaline straw pulp black liquor has a Baume degree of 2, solid content=4%, pH=9; the mixed straw pulp black liquor is evaporated and concentrated to a solid content of 15.1%, and the Baume degree is 9; promptly obtains the alkaline method and the sub- Ammonium method mixed and concentrated straw pulp black liquor; its pH is 7; the pH of alkali method and ammonium method mixed and concentrated straw pulp black liquor is adjusted to 5 with formic acid, separates out lignin, adds the polyferric sulfate of black liquor weight 2ppm, static Set, and then filter the black liquor, the filtrate is the fulvic acid solution.

Embodiment 2

[0040] Mix the black liquor of ammonium method grass pulp and the black liquor of alkali method straw pulp at a volume ratio of 100:1 to obtain mixed straw pulp black liquor; 10; Alkaline straw pulp black liquor has a Baume degree of 9, solid content=15%, pH=13; the mixed straw pulp black liquor is evaporated and concentrated to a solid content of 65%, and the Baume degree is 40; Mix and concentrate straw pulp black liquor by ammonium method; its pH=11, adjust the pH of the concentrated black liquor to 2 with acetic acid, precipitate lignin, add basic aluminum chloride with a black liquor weight of 50ppm, let stand, and then filter the black liquor , the filtrate is the fulvic acid solution. The fulvic acid solution is dried to obtain fulvic acid.

Embodiment 3

[0042] Mix the black liquor of ammonium method straw pulp and the black liquor of alkali method straw pulp at a volume ratio of 1:10 to obtain mixed straw pulp black liquor; 8; Alkaline straw pulp black liquor has a Baume degree of 5, solid content=7%, pH=10; the mixed straw pulp black liquor is evaporated and concentrated to a solid content of 30%, and the Baume degree is 17; Mix and concentrate straw pulp black liquor by ammonium method; pH=9, adjust the pH of the thick black liquor to 4 with propionic acid, precipitate lignin, add ammonium polyacrylate with a black liquor weight of 5ppm, let it stand, then filter the black liquor, and the filtrate That is, fulvic acid solution. Extract the fulvic acid solution with ion exchange resin to obtain high-purity fulvic acid.

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Abstract

The invention provides a method for extracting fulvic acid from straw pulp black liquor, comprising: acid with the conditioning of below pH5 is added into straw pulp black liquor mixed by an alkali process and an ammonium sulfite method so as to separate lignin, later flocculant is added for removing the lignin by filtration, finally the filtrate is the fulvic acid solution; and the fulvic acid solution can also be dried for preparing crude fulvic acid or further purified for obtaining fulvic acid of high purity. The invention can also treat two types of black liquid simultaneously, be used as soil conditioner or water-reducing agent, and can get good economic benefit; the extracted fulvic acid has high price; and the lignin, which is a by-product of the invention, also has wide usage.

Description

technical field [0001] The invention provides a method for extracting fulvic acid from straw pulp black liquor, which belongs to the field of straw pulp black liquor treatment. Background technique [0002] Fulvic acid is a type of humic acid, which can be isolated from humic acid derived from coal, or directly extracted from peat and weathered coal. Fulvic acid from this source is collectively referred to as mineral-sourced fulvic acid. For example, the Chinese patent with the application number CN01141835.4 provides a method for producing high-purity fulvic acid with supercritical CO2, using peat, lignite and weathered coal as raw materials. After chemical reaction and extraction, solid Liquid separation; the separated liquid is then extracted with supercritical CO2; the extract is dried to obtain high-purity fulvic acid after removing the entraining agent. [0003] Another major source of fulvic acid comes from agricultural and forestry waste, which is obtained through m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H5/00C08H99/00
Inventor 李洪法宋明信杨吉慧郭良进陈学涛
Owner SHANDONG TRALIN PAPER
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