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Method for extracting and separating lignin from alkali cooking liquid of kraft pulping

A technology of kraft method and lignin, which is applied in the direction of pulping with acid/acid anhydride, etc., to achieve the effect of small process investment, simple processing equipment and easy operation

Inactive Publication Date: 2018-12-07
JINING MING SHENG NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to improve the output, quality and efficiency of the production of lignin products by resource utilization of the existing kraft pulping alkali cooking liquor, the present invention solves the problems existing in the present papermaking kraft pulping alkali cooking liquor treatment process, and proposes a method from Method for extracting and separating lignin from kraft pulping soda cooking liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 extracts and separates lignin from kraft pulping alkali cooking liquor, comprising the following steps:

[0029] (1) 4kg ferrous sulfate (95%, Shanghai Binhu Environmental Protection Technology Co., Ltd.) is dissolved in 200kg water; (2) in 500 square meters of sulfate alkali cooking liquid (6 Baume degree, density 1.019g / ml, PH12. 5. Add the above solution into the lignin content 0.56%), stir for 10 minutes, let it settle for 2 hours, and filter with suction;

[0030] (3) The filtrate is filtered through an ultrafiltration membrane with a molecular weight cut-off of polyvinyl chloride material of 1000, and the solution that passes through is recovered for the neutralization of the final acidic waste liquid;

[0031] (4) adding 98% sulfuric acid to the concentrated lignin solution to adjust Ph to 3.0;

[0032] (5) Transfer to the reaction kettle in batches and heat up to 90°C, stir and keep warm for 1 hour, then cool down to 35°C, let stand for precipitati...

Embodiment 2

[0033] Embodiment 2 extracts and separates lignin from kraft pulping alkali cooking liquor, comprising the following steps:

[0034] (1) 8kg ferrous sulfate (95%, Shanghai Binhu Environmental Protection Technology Co., Ltd.) is dissolved in 400kg water; (2) in 1000 cubic meters of sulfate alkali cooking liquid (6 Baume degree, density 1.019g / ml, PH12. 5. Add the above solution to the lignin content 0.56%), stir for 15 minutes, let stand for precipitation for 3 hours, and filter with suction;

[0035] (3) The filtrate is filtered through an ultrafiltration membrane with a molecular weight cut-off of polyvinyl chloride material of 1000, and the solution that passes through is recovered for the neutralization of the final acidic waste liquid;

[0036] (4) adding 98% sulfuric acid to the concentrated lignin solution to adjust Ph to 2.5;

[0037] (5) Transfer to the reaction kettle in batches and heat up to 98°C, stir and keep warm for 2 hours, then cool down to 30°C, let stand fo...

Embodiment 3

[0038] Embodiment 3 extracts and separates lignin from kraft pulping alkali cooking liquor, comprising the following steps:

[0039] (1) 4kg ferrous sulfate (95%, Shanghai Binhu Environmental Protection Technology Co., Ltd.) is dissolved in 200kg water; (2) in 500 square meters of sulfate alkali cooking liquid (6 Baume degree, density 1.019g / ml, PH12. 5. Add the above solution into the lignin content 0.56%), stir for 15 minutes, let it settle for 2 hours, and filter with suction;

[0040] (3) The filtrate is filtered through an ultrafiltration membrane with a molecular weight cut-off of 1000 made of polyvinyl chloride, and the permeated solution is recovered for the neutralization of the final acidic waste liquid

[0041] (4) adding 98% sulfuric acid to the concentrated lignin solution to adjust Ph to 2.0;

[0042] (5) Transfer to the reaction kettle in batches and heat up to 95°C, stir and keep warm for 2 hours, then cool down to 25°C, let stand for precipitation for 4 hours...

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PUM

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Abstract

The invention discloses a method for extracting and separating lignin from an alkali cooking liquid of kraft pulping, and relates to the fields of pulping and papermaking and biomass materials. According to the process provided by the invention, the lignin is extracted and separated through treatment on the alkali cooking liquid of kraft pulping by using a flocculating agent, an ultrafiltration membrane and sulfuric acid, the yield is 95% or above, and the lignin products in the alkali cooking liquid of kraft pulping can be fully recycled, so that the resource utilization of the alkali cookingliquid of kraft pulping is improved, the content of lignin serving as a pollutant is remarkably reduced, the extraction and separation efficiency is further improved, and the characteristics of resource utilization and environmental protection are embodied.

Description

technical field [0001] The invention relates to the fields of pulping, papermaking and biomass materials, in particular to a method for extracting and separating lignin from kraft pulping alkali cooking liquor. 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 industrial energy and resources and causes serious pollution. 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, lignin in cooking liquid is one of the main factors causing pollution. [0003] Lignin is a kind of substance composed of polymerized aromatic alcohols, which exists in woody tissue, and its main function is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/04
CPCD21C3/04
Inventor 施晓旦李赛邵威
Owner JINING MING SHENG NEW MATERIALS CO LTD
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