Method for lignin extraction by papermaking black liquor acidification and flocculation precipitation

A technology for biological acidification and papermaking black liquor, applied in the fields of resources and environment, can solve the problems of high cost of foreign inorganic acid or organic acid, increase the difficulty and cost of treatment, and high cost, achieve good social significance and economic value, and enhance the follow-up treatment. Features, the effect of reducing processing costs

Inactive Publication Date: 2007-02-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct evaporative drying not only consumes a lot of energy and high cost, but also the obtained lignin product has high impurity components and low commodity characteristics
Inorganic acid precipitation and precipitation to extract lignin, although lignin has high purity, on the one hand, it consumes a large amount of external inorganic acid or

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1: A small paper-making company uses black liquor to produce lignin

[0021] (1) Store 10 cubic meters of papermaking black liquor with a pH of 11.28 every day in a black liquor storage container, and the content of black liquor lignin is 8.2597g / L;

[0022] (2) Add 3.6 tons (dry weight) of chopped rice straw into a 100 cubic meter biological acidification reactor, inoculate biogas residue and biogas residue with 360kg (water content of 80%), add 90 cubic meters of water, Fermentation at room temperature, after 5 days of reaction, the pH value of the fermentation broth drops to 5.32, and the VFA concentration is 40mol / L in terms of acetic acid;

[0023] (3) Extract 50 cubic meters of fermentation liquid from the acidification reactor in step (2) and store it in a fermentation acid liquid storage container, with a withdrawal cycle of 1 time / day;

[0024] (4) The black liquor in step (1) and the fermentation acid liquor in step (3) are pumped into a 1.2 cubic meter mi...

Example Embodiment

[0028] Example 2: A medium-sized paper mill uses papermaking black liquor to produce lignin

[0029] (1) 1,000 tons of papermaking black liquor with a pH of 12.35 produced by the company every day are stored in a black liquor storage tank, and the lignin content of the black liquor is 10.865g / L;

[0030] (2) Put 10.2 tons (dry weight) of chopped Spartina alterniflora into a 300 cubic meter biological acidification reactor, inoculate 1200kg municipal sludge (water content 78%), add 270 cubic meters of water, and ferment at room temperature;

[0031] (3) Construct 19 biological acidification reaction systems according to the method of step (2);

[0032] (4) After 5 days of reaction, the pH value of the fermentation broth drops to 5.50, and the VFA concentration is 50mol / L in terms of acetic acid.

[0033] (5) Sequentially withdraw 180 cubic meters of fermentation broth from each biological acidification reaction device into the fermentation acid storage tank;

[0034] (6) The black ...

Example Embodiment

[0038] Example 3: A large paper mill produces lignin

[0039] (1) Take 8,000 tons of papermaking black liquor with a pH of 12.65 and store it in the black liquor storage tank, and the lignin content of the black liquor is 11.563g / L;

[0040] (2) Put 90 tons (dry weight) of chopped wheat straw into a 2800 cubic meter biological acidification reactor, inoculate 10 tons of municipal sludge (water content 78%), add 2600 cubic meters of water, and ferment at room temperature.

[0041] (3) Construct 9 more biological acidification reaction systems according to the method of step (2)

[0042] (4) After 5 days of reaction, the pH value of the fermentation broth drops to 5.20, and the VFA concentration is 36 mol / L in terms of acetic acid.

[0043] (5) Sequentially withdraw 2,400 cubic meters of fermentation broth from each biological acidification reaction device into the fermentation acid storage tank;

[0044] (6) The black liquor in step (1) and the fermentation acid liquor in step (5) ...

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PUM

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Abstract

The invention relates to a method for extracting lignin via paper liquor biological acidification-flocculation deposition, wherein said method comprises: the paper liquor is stored into the liquor storage; adding solid organic into biological acidification reaction container, to ferment and generate organic acid liquid, while the ferment temperature is 2-40Deg. C for 4-5 days; when the pH value of ferment liquid in the reaction container is reduced to 5-6; and the volatile fatty acid number (VFA) is 2-80mol/L at acetic acid density, to pump the acid liquid into the ferment acid liquid storage; mixing the liquor with the ferment acid liquid, depositing, and entering into the container, and discharging some; dewatering the deposit, drying to obtain the lignin.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a method for extracting lignin from papermaking black liquor through biological acidification-flocculation precipitation. Background technique [0002] my country is one of the countries that first invented papermaking technology, and it is also a big country in papermaking. However, my country's papermaking industry still uses traditional production processes, mainly alkaline method, sulfurous acid method, neutral sub-sale method and semi-chemical method, etc. A large amount of black liquor is discharged during the pulping and cooking process of several traditional paper pulping technologies, which seriously pollutes the local surface water body. At present, most of the rivers and lakes in our country are polluted or threatened by pollution. Among the pollution sources, the contribution of the paper industry is more prominent. Serious environmental...

Claims

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Application Information

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IPC IPC(8): D21C11/00
Inventor 朱洪光王彪陈小华朱鹏
Owner TONGJI UNIV
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