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Method for extracting fulvic acid from straw pulp black liquor by ammonium sulfite method

A technology of straw pulp black liquor and ammonium method, which is applied in the field of straw pulp black liquor treatment, can solve the problems of unaware of direct extraction of fulvic acid, low biological activity, and great difference in utilization value, etc., to achieve low raw material cost, The effect of strong permeability and good economic benefits

Active Publication Date: 2010-12-08
吉林泉德秸秆综合利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the above-mentioned patent did not realize that fulvic acid can be directly extracted from black liquor, and most of the obtained humic acids are black humic acid and brown humic acid, because black humic acid and brown humic acid are insoluble in water , becomes a gel-like precipitate under acidic conditions. Compared with fulvic acid, the biological activity of black humic acid and brown humic acid is very low, and the utilization value is far apart.

Method used

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  • Method for extracting fulvic acid from straw pulp black liquor by ammonium sulfite method
  • Method for extracting fulvic acid from straw pulp black liquor by ammonium sulfite method
  • Method for extracting fulvic acid from straw pulp black liquor by ammonium sulfite method

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Embodiment 1

[0051] Ammonium method grass pulp black liquor Baume degree 2, solid content = 4%, pH value 7; use formic acid to adjust the pH of the imonium method straw pulp black liquor to 5, separate out ammonium lignosulfonate, add black liquor weight 2ppm The polyferric sulfate is allowed to stand, and then the black liquor is filtered, and the filtrate is the fulvic acid solution.

Embodiment 2

[0053] Ammonium method grass pulp black liquor Baume degree 9, solid content = 15%, pH value 10; use acetic acid to adjust the pH of the concentrated black liquor to 2, separate out ammonium lignin sulfonate, add basic chloride of black liquor weight 50ppm Aluminum, let it stand, then filter the black liquor, the filtrate is the fulvic acid solution. The fulvic acid solution is dried to obtain fulvic acid.

Embodiment 3

[0055] The ammonium method grass pulp black liquor has a Baume degree of 5, a solid content of 9%, and a pH value of 8; it is evaporated and concentrated to a solid content of 15.1%, and the Baume degree is 9; the concentrated straw pulp black liquor is obtained, and treated with propionic acid Adjust the pH of the thick black liquor to 4 to precipitate ammonium lignosulfonate, add ammonium polyacrylate with a weight of 5ppm to the black liquor, let it stand, and then filter the black liquor, and the filtrate is the 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 by an ammonium sulfite method, comprising: acid with the conditioning of below pH5 is added into the ammonium sulfite straw pulp black liquor 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 solutioncan also be dried for preparing crude fulvic acid or further purified for obtaining fulvic acid of high purity. The extracted fulvic acid has expensive price; the lignin, which is a by-product of theinvention, also has wide usage; and the invention can also be used as soil conditioner or water-reducing agent, and can get good economic benefit.

Description

technical field [0001] The invention provides a method for extracting fulvic acid from straw pulp black liquor by an ammonium method, and 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 i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H5/00C08H99/00
Inventor 李洪法宋明信杨吉慧郭良进陈学涛
Owner 吉林泉德秸秆综合利用有限公司