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A method for enriching and purifying tannic acid from papermaking waste liquid

A technology for papermaking waste liquid and tannic acid, applied in chemical instruments and methods, organic chemistry, sugar derivatives, etc., can solve the problems of high cost, high production cost, low product purity, etc. The effect of resource reuse and high resource utilization

Active Publication Date: 2021-09-03
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent with the existing application number CN201810573133.6 discloses a method for recovering tannic acid from rosin production wastewater, using multi-stage extraction and multi-stage back-extraction equipment to recover tannic acid, the pH value needs to be adjusted before and after the stage, and the consumption is relatively high. More acid liquid, the acid added in the early stage is not recyclable, and valuable separable by-products cannot be obtained
[0005] In the existing preparation method of tannic acid, the chemical method has high equipment investment, high solvent consumption, and high cost; the water extraction method requires tedious preliminary preparation, and the later operation steps are not suitable for continuous batch production, and the product purity is low
Among them, the current chemical method is one of the main methods for producing tannic acid. It is mainly carried out by mechanically breaking the wall of Dendrobium gallica, adding chemical reagents at high temperature, and subsequent secondary separation is required. The production cost is high, and the product cannot be continuously produced.
The leaching method is also one of the main methods for producing tannic acid. The method is to mechanically break the wall of Dendrobium galla officinale, extract it with warm water, and then purify and extract it with an organic solvent. This method requires high raw materials and cannot be continuously produced. The production efficiency is low

Method used

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  • A method for enriching and purifying tannic acid from papermaking waste liquid
  • A method for enriching and purifying tannic acid from papermaking waste liquid
  • A method for enriching and purifying tannic acid from papermaking waste liquid

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Experimental program
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Effect test

Embodiment 1

[0029] (1) the coniferous wood soda process waste liquid that 400kg paper mill provides (wherein solid matter accounts for 5% of papermaking waste liquid gross mass, and pH value is 3.5, and hemicellulose content is 1.65%, and lignin content is 1.75%, Cellulose waste liquid total sugar is 0.1kg) is placed in the separation container, removes insoluble suspended solids with 50 mesh sieves, settles after stirring for 3 hours, discharges the lower layer of fine fibers and silt, and uses a molecular weight cut-off of 140 Daltons The flat polyamide nanofiltration membrane assembly is concentrated to 20% of the total volume, and the concentrated solution (wherein the concentration of hemicellulose is 49.38g / L, the concentration of lignin is 10.28g / L, and the concentration of tannic acid is 124g / L) Concentration is 1.58g / L), 20kg concentrated solution adds 500g n-butanol and reclaims the mass ratio of hemicellulose to be 91%;

[0030] (2) Perform multi-stage countercurrent extraction...

Embodiment 2

[0037] (1) the coniferous wood and broad-leaved wood alkali process waste liquid that 8000kg paper mill provides (wherein solid matter accounts for 5% of papermaking waste liquid total mass, and pH value is 3.5, and hemicellulose content is 1.65%, and lignin content is 1.75%, the total sugar of cellulose waste liquid is 0.1kg) is placed in the separation container, removes insoluble suspended matter with 50 mesh sieves, settles after stirring for 3 hours, discharges the lower layer of fine fibers and silt, and uses a molecular weight cut-off of 140 Dalton's flat-panel polyamide nanofiltration membrane assembly is concentrated to 20% of the total volume to obtain a concentrated solution of 125g / L (wherein the hemicellulose concentration is 48.82g / L, and the lignin concentration is 10.44g / L, Tannic acid concentration is 1.68g / L), 200kg concentrated solution adds 500g n-butanol and reclaims the mass ratio of hemicellulose to be 90%;

[0038] (2) Perform multi-stage countercurrent...

Embodiment 3

[0046] (1) the coniferous wood and broad-leaved wood alkali process waste liquid that 7600kg paper mill provides (wherein solid matter accounts for 5% of papermaking waste liquid total mass, and pH value is 3.5, and hemicellulose content is 1.65%, and lignin content is 1.75%, the total sugar of cellulose waste liquid is 0.1kg) is placed in the separation container, removes insoluble suspended matter with 50 mesh screens, settles after stirring for 3 hours, discharges the fine fiber and silt of the lower layer, and uses a molecular weight cut-off of 140 Dalton's flat-panel polyamide nanofiltration membrane assembly is concentrated to 20% of the total volume to obtain a concentrated solution with a concentration of 125g / L (wherein the hemicellulose concentration is 48.82g / L, and the lignin concentration is 10.44g / L, Tannic acid concentration is 1.68g / L), 1520kg concentrated solution adds 500g n-butanol and reclaims the mass ratio of hemicellulose to be 92%;

[0047] (2) Perform ...

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Abstract

The invention discloses a method for enriching and purifying tannic acid from papermaking waste liquid, which comprises the following steps: (1) purifying the papermaking waste liquid, and concentrating the purified papermaking waste liquid through a nanofiltration membrane module to obtain tannin-containing A concentrated solution of acid; (2) carrying out multistage countercurrent extraction to the concentrated solution prepared in step (1), using an organic solvent group as an extractant to obtain an extract containing tannic acid; (3) extracting the concentrated solution in step (2) The obtained extraction liquid containing tannic acid is carried out multi-stage countercurrent back extraction, adopts NaOH solution as back extraction liquid, obtains the back extraction liquid containing tannic acid; (4) after the back extraction liquid that step (3) obtains is cooled , add acid to adjust the pH value, place it in a storage tank, then filter, concentrate in vacuum, and spray dry to obtain industrial grade tannic acid. The invention not only improves the resource reuse of papermaking waste liquid, but also significantly reduces the content of tannic acid, lignin and the like as pollutants; and embodies the characteristics of resource utilization and environmental protection.

Description

technical field [0001] The invention relates to the field of pulping, papermaking and biomass materials, in particular to a method for enriching and purifying tannic acid from papermaking waste liquid. Background technique [0002] The paper industry is an important traditional pillar industry in my country. At the same time, the paper industry is also an industry that consumes a lot of resources and pollutes heavily in our country. According to the data of China's environmental department in 2007: the discharge of the paper industry is 3.18 billion cubic meters, accounting for 18.4% of the total industrial discharge in the country; the COD discharge is 1.526 million tons, accounting for 29.8% of the total discharge of the country. Among them, hemicellulose, lignin and organic acid salts in waste liquid are one of the main factors causing pollution. [0003] Tannic acid is an important organic acid, which is widely used in food, medicine, chemical industry, brewing and othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H13/08C07H1/06
CPCC07H1/06C07H13/08
Inventor 施晓旦朱宁辉赵吉
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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