Method for extracting lignin from chemithermomechanical pulp treatment liquid

A technology for treating liquid and chemical mechanical pulp is applied in the fields of pulping, papermaking and biomass materials, which can solve the problems of low lignin precipitation yield, low lignin content, long processing time, etc. The effect of high rate and short processing time

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 a low yield of lignin precipitation, and the efficiency is not high, and the processing time is long
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

[0026] 500 square meters pulp treatment solution (5 degrees Baume, density 1.019 g / ml, pH 8.89, lignin content 0.46%) was left to settle for 4 hours. 1.5kg polyacrylamide (concentration 90%, molecular weight 10 million, cation concentration 30%), 3.0kg aluminum sulfate are dissolved in 200kg water.

[0027] The temperature of the treatment solution was naturally cooled, and 37% hydrochloric acid was added to adjust the pH to 3.0, and 5 kg of the above-prepared polyacrylamide and aluminum sulfate solution (Henan Ousheng Chemical Products Co., Ltd., 99%) was added. The treated liquid was transferred to the reaction kettle in batches, and the temperature was raised to 90°C, stirred and kept for 1 hour, then cooled to 30°C, left to settle for 3 hours, and the solid was separated by filtration to obtain a total of 2.10 tons of lignin with a content of 98%. The extraction rate is 88%.

Embodiment 2

[0029] 1000 square meters pulp treatment solution (5 degrees Baume, density 1.019 g / ml, pH 8.89, lignin content 0.46%) was left to settle for 5 hours. 3kg polyacrylamide (concentration 90%, molecular weight 10 million, cation concentration 30%) and 6.0kg aluminum sulfate are dissolved in 400kg water.

[0030] The temperature of the treatment solution was naturally cooled, 37% hydrochloric acid was added to adjust the pH to 2.0, and 10 kg of the prepared polyacrylamide solution and aluminum sulfate (Henan Ousheng Chemical Products Co., Ltd., 99%) were added. Transfer the treated treatment solution to the reaction kettle in batches and raise the temperature to 90°C, stir and keep it warm for 2 hours, then lower the temperature to 30°C, let it stand for precipitation for 3 hours, and centrifuge to obtain a total of 4.40t lignin with a content of 98%. The rate is 92%.

Embodiment 3

[0032] 500 square meters pulp treatment solution (5 degrees Baume, density 1.019 g / ml, pH 8.89, lignin content 0.46%) was left to settle for 4 hours. 1.5kg polyacrylamide (concentration 90%, molecular weight 10 million, cation concentration 30%) and 3.0kg aluminum sulfate are dissolved in 200kg water.

[0033] The temperature of the treatment solution was naturally cooled, and 37% hydrochloric acid was added to adjust the pH to 2.5, and 5 kg of the prepared polyacrylamide solution and aluminum sulfate (Henan Ousheng Chemical Products Co., Ltd., 99%) were added. Transfer the treated solution to the reaction kettle in batches and raise the temperature to 90°C, stir and keep it warm for 3 hours, then lower the temperature to 30°C, let it settle for 4 hours, and centrifuge to obtain a total of 2.18t lignin with a content of 98%. The rate is 91%.

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Abstract

The invention discloses a method for extracting lignin from chemithermomechanical pulp treatment liquid. The method comprises the following steps of regulating the pH value of the chemithermomechanical pulp treatment liquid to be 1.5 to 3.0; adding a proper amount of polyacrylamide and aluminum sulfate; after the mixing, obtaining pre-steaming and boiling liquid; raising the temperature of the pre-steaming and boiling liquid to 80 to 100 DEG C; performing heat insulation for 1 to 3 hours; after the temperature lowering, performing still standing for a period of time; performing filtering and separation to obtain the lignin. When the method provided by the invention is used for extracting the lignin from chemithermomechanical pulp treatment liquid, the one-step extraction rate of the ligninis as high as 85 percent or higher; 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; theprocess investment is small; 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 chemical-mechanical pulp treatment liquid. 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...

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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