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Method for extracting lignin from soda pulping black liquid

A technology of alkaline pulping and black liquor, which is applied in the field of lignin extraction, can solve the problems of low lignin content, high consumption of acid solution, and difficulty in reusing, etc., and achieve high extraction rate, short processing time and low cost Effect

Inactive Publication Date: 2018-11-23
JINING MING SHENG NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a process has low yield of lignin precipitation, low efficiency, long processing time, excessive consumption of acid solution, and poor economy
Moreover, the obtained lignin content is not high, it is difficult to reuse and can only be treated as waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 500 square soda pulping black liquor (8 degrees Baume, density 1.319 g / ml, pH 12.39, lignin content 8%) was cooled to 90°C. 1.5kg polyacrylamide (concentration 90%, molecular weight 10 million, cationic concentration 30%), 3.0kg polyacrylamide and aluminum chloride are dissolved in 200kg water.

[0028] Add 98% sulfuric acid to adjust the pH to 3.0, and add 5 kg of polyacrylamide and polyaluminum chloride solution prepared above (Henan Ousheng Chemical Products Co., Ltd., 99%). The treated black liquor was cooled down to 30°C, allowed to settle for 3 hours, and the solid was separated to obtain a total of 47.37t of lignin with a content of 98% and an extraction rate of 88%.

Embodiment 2

[0030] 1000 square soda pulping black liquor (8 degrees Baume, density 1.319 g / ml, pH 12.39, lignin content 8%) was cooled to 90°C. 3kg polyacrylamide (concentration 90%, molecular weight 10 million, cationic concentration 30%), 6.0kg polyacrylamide and aluminum chloride are dissolved in 400kg water.

[0031] Add 98% sulfuric acid to adjust the pH to 2.0, and add 10 kg of the above-prepared polyacrylamide solution and polyaluminum chloride (Henan Ousheng Chemical Products Co., Ltd., 99%). The treated black liquor was cooled down to 30°C, allowed to settle for 3 hours, and the solid was separated to obtain a total of 99.06t lignin with a content of 98% and an extraction rate of 92%.

Embodiment 3

[0033] 500 square soda pulping black liquor (8 degrees Baume, density 1.319 g / ml, pH 12.39, lignin content 8%)) was cooled to 90°C. 1.5kg polyacrylamide (concentration 90%, molecular weight 10 million, cationic concentration 30%), 3.0kg polyacrylamide and aluminum chloride are dissolved in 200kg water.

[0034] Add 98% sulfuric acid to adjust the pH to 2.5, add 5 kg of the prepared polyacrylamide solution and polyaluminum chloride (Henan Ousheng Chemical Products Co., Ltd., 99%). The treated black liquor was cooled down to 30°C, allowed to settle for 3 hours, and the solid was separated to obtain a total of 48.99t lignin with a content of 98% and an extraction rate of 91%.

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Abstract

The invention discloses a method for extracting lignin from soda pulping black liquid. The method comprises the following steps of lowering the temperature of the high-temperature soda pulping black liquid obtained through pulping to 80 to 100 DEG C; regulating the pH value to 1.5 to 3.5; adding a proper amount of polyacrylamide and poly aluminum chloride; performing mixing, still standing temperature lowering and still standing precipitation for a certain time; performing filtering and separation to obtain the lignin. When the method provided by the invention is used for extracting the ligninfrom the soda pulping black liquid, the lignin one-step extraction rate is as high as more than 85 percent; the treatment time is short; the treatment equipment is simple; the direct viewing is realized in the reaction process; the operation is simple and convenient; the process investment is low; the cost is low.

Description

technical field [0001] The invention relates to the field of pulping, papermaking and biomass materials, in particular to a method for extracting lignin from alkaline pulping black liquor Background technique [0002] The pulp and paper industry is an important pillar industry in my country. At the same time, it 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 displacement of the pulp and 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 formed by the polymerization of aromatic alcohols. It exists in woody tissue. Its main function is to harden the cell wall by form...

Claims

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Application Information

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IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 施晓旦赵吉邵威
Owner JINING MING SHENG NEW MATERIALS CO LTD
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