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
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  • Application Information

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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

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0016] Example 1

[0017] A method for preparing sulfonated lignin from sulphate papermaking waste liquid, comprising the following steps: firstly, the papermaking waste liquid is subjected to membrane treatment to obtain a membrane concentrate, and the membrane treatment can adopt a roll membrane or a plate membrane to treat the papermaking waste liquid. The high-molecular alkali lignin is trapped on the membrane surface, 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 standing for more than 5 minutes for precipitation, filtering by a filter device or centrifugal separation by a centrifugal separation device to remove water-insoluble particles and fibrous impurities.

[0019] The membrane concentrate is acidified by sulfuric acid, hydrochloric acid or carbon dioxide before sulfonation to ...

Example Embodiment

[0022] Example 2

[0023] A method for preparing sulfonated lignin from sulphate papermaking waste liquid, comprising the following steps: firstly, the papermaking waste liquid is subjected to membrane treatment to obtain a membrane concentrate. The membrane treatment can be a roll membrane, a tubular membrane or a plate membrane. In the waste liquid treatment, the high-molecular alkali lignin is trapped on the membrane surface, accumulated, and concentrated 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 and settling for more than 5 minutes, filtering by a filter device or centrifugal separation by a centrifugal separation device to remove water-insoluble particles and fibrous impurities.

[0025] The membrane concentrate is subjected to oxidation treatment on the membrane concentrate before sulfonation, so t...

Example Embodiment

[0028] Example 3

[0029] A method for preparing sulfonated lignin from sulphate papermaking waste liquid, comprising the following steps: firstly, the papermaking waste liquid membrane is processed to obtain a membrane concentrate, and the membrane treatment can adopt roll membrane, tubular membrane or plate membrane to treat papermaking waste In the liquid treatment, the high-molecular alkali lignin is trapped on the surface of the membrane, accumulated, and concentrated 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 and settling for more than 5 minutes, filtering by a filter device or centrifugal separation by a centrifugal separation device to remove water-insoluble particles and fibrous impurities.

[0031] The membrane concentrate is subjected to oxidation treatment on the membrane concentrate before su...

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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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