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Method used for preparing sulfonated lignin from sulfate papermaking waste water

A technology for sulfonating lignin and papermaking waste liquid, which is applied in the field of preparing sulfonated lignin from sulfate papermaking waste liquid, can solve the problems of low thermal stability of lignin, long production cycle, and low production efficiency, and shorten the production cycle , Improve production efficiency, high thermal stability

Inactive Publication Date: 2016-05-25
ZHEJIANG JIEFA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The patent number is: 201310082509.0, and the patent name is: a method for preparing lignin by using papermaking black liquor. The manufacturing process has complex processes, long production cycle, and low production efficiency. gender issues

Method used

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Effect test

Embodiment 1

[0017] A method for preparing sulfonated lignin from kraft papermaking waste liquid, comprising the following steps: first, the papermaking waste liquid is treated with a membrane to obtain a membrane concentrate, and the membrane treatment can use a roll membrane or a plate membrane to treat the papermaking waste liquid to thereby The high-molecular alkali lignin is trapped on the surface of the membrane, accumulated and concentrated to obtain a membrane concentrate.

[0018] The papermaking waste liquid is pretreated before the membrane treatment to remove water-insoluble particles and fibrous impurities. The pretreatment can be carried out by static precipitation for more than 5 minutes, filtration by a filter device or centrifugation by a centrifugal separation device to remove water-insoluble particles and fibrous impurities.

[0019] Before the sulfonation of the membrane concentrate, the concentrated solution is acidified by sulfuric acid, hydrochloric acid or carbon di...

Embodiment 2

[0023] A method for preparing sulfonated lignin from sulfate papermaking waste liquid, comprising the following steps: first, the papermaking waste liquid is treated with a membrane to obtain a membrane concentrate. The waste liquid is treated so that the high-molecular alkali lignin is trapped on the surface of the membrane, accumulates, and concentrates to obtain a membrane concentrate.

[0024] The papermaking waste liquid is pretreated before the membrane treatment to remove water-insoluble particles and fibrous impurities. The pretreatment can be carried out by standing still, settling for more than 5 minutes, filtering with a filter device or centrifuging with a centrifugal separation device to remove water-insoluble particles and fibrous impurities.

[0025] Before the sulfonation of the membrane concentrate, the membrane concentrate is oxidized so that the pH of the membrane concentrate is 8-13. The oxidation treatment can be air oxidation treatment or oxidant oxidati...

Embodiment 3

[0029] A method for preparing sulfonated lignin from kraft papermaking waste liquid, comprising the following steps: firstly, membrane-treating the papermaking waste liquid to obtain a membrane concentrate; Liquid treatment so that the high-molecular alkali lignin is trapped on the surface of the membrane, accumulates, and concentrates to obtain a membrane concentrate.

[0030] The papermaking waste liquid is pretreated before the membrane treatment to remove water-insoluble particles and fibrous impurities. The pretreatment can be carried out by standing still, settling for more than 5 minutes, filtering with a filter device or centrifuging with a centrifugal separation device to remove water-insoluble particles and fibrous impurities.

[0031] Before the sulfonation of the membrane concentrate, the membrane concentrate is oxidized to obtain a pH value of 8-13. The oxidation treatment can be air oxidation treatment or oxidant oxidation treatment, and the oxidant can be ozone...

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PUM

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Abstract

The invention discloses a method used for preparing sulfonated lignin from sulfate papermaking waste water. The method comprises following steps: firstly, papermaking waste liquid membrane is treated so as to obtain a membrane concentrate, and the membrane concentrate is subjected to sulfonation and condensation successively so as to obtain sulfonated lignin. The method is capable of changing waste into valuables, and reducing environmental pollution; at the same time technology step is simplified, production period is shortened, and production efficiency is increased; the obtained sulfonated lignin is high in thermal stability, and excellent in contamination resistance and hydrophilic performance.

Description

technical field [0001] The invention relates to a method for preparing sulfonated lignin from sulfate papermaking waste liquid. Background technique [0002] The paper industry is a heavy polluting industry in my country, and the most important reason is the treatment of paper black liquor. Under normal circumstances, enterprises generally adopt two methods for black liquor treatment: one is to concentrate and incinerate black liquor; the other is to use black liquor to develop lignin products. In the former method, the black liquor is concentrated and burned. Although the alkali and part of the calorific value in the black liquor can be recovered, it is a low-value utilization method for alkali lignin, and the equipment investment is large and energy consumption is high. The latter method is a good way to rationally utilize alkali lignin by chemically modifying alkali lignin to develop lignin chemical products and increase its high added value. [0003] The patent number ...

Claims

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Application Information

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IPC IPC(8): C08H7/00
Inventor 邵国标
Owner ZHEJIANG JIEFA TECH
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