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Method for preparing water-soluble cationic lignin-based flocculant by semi-dry method

A water-soluble cation and flocculant technology, which is applied in the field of material science, can solve the problems of large dosage, small dosage, and large flocs, and achieve the effects of less water consumption, simplified preparation conditions, and strong positive charge

Inactive Publication Date: 2019-07-05
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional inorganic flocculants such as aluminum sulfate, alum, polyaluminum chloride, etc., have the disadvantages of large dosage, serious corrosion, and many residues. They have experienced the development of inorganic low molecular flocculants to organic polymer flocculants. With its advantages of small dosage, large flocs and fast flocculation rate, it has gradually become the mainstream flocculant in the market.

Method used

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  • Method for preparing water-soluble cationic lignin-based flocculant by semi-dry method
  • Method for preparing water-soluble cationic lignin-based flocculant by semi-dry method
  • Method for preparing water-soluble cationic lignin-based flocculant by semi-dry method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 2g of prehydrolyzed lignin, add 6.22g of METAC solution with a mass concentration of 75% and 2.89g of deionized water, fully mix and dissolve in a No. 5 ziplock bag, adjust the pH value of the reaction system to 5 to obtain a reaction solution , Nitrogen gas to fully remove the oxygen in the reaction system, after adding 0.04g of potassium persulfate, stop the nitrogen gas flow, seal the ziplock bag and place it in a water bath at 70°C for 1.5h to obtain the crude lignin grafted METAC product.

[0035] The crude product was centrifuged and washed with absolute ethanol (3000r / min), and then dialyzed with a dialysis bag (MWCO: 3000Da) for 48h. Obtain lignin-METAC graft copolymer (referred to as L-M graft copolymer) through hot air drying.

Embodiment 2

[0037] Weigh 2g of enzymatic lignin, add 9.33g of METAC solution with a mass concentration of 75% and 3.67g of deionized water, mix and dissolve them in a No. 5 ziplock bag, adjust the pH value of the reaction system to 4 to obtain a reaction solution, and pass Nitrogen gas is used to fully remove the oxygen in the reaction system. After adding 0.06g of potassium persulfate, the nitrogen gas flow is stopped, and the ziplock bag is sealed and placed in a water bath at 70°C for 1.5 hours to obtain the crude product of lignin grafted METAC.

[0038] The crude product was centrifuged and washed with absolute ethanol (3000r / min), and then dialyzed with a dialysis bag (MWCO: 3000Da) for 48h. Obtain lignin-METAC graft copolymer (referred to as L-M graft copolymer) through hot air drying.

Embodiment 3

[0040] Weigh 2g of prehydrolyzed lignin, add 6.22g of METAC solution with a mass concentration of 75% and 1.30g of deionized water, fully mix and dissolve them in a No. 5 ziplock bag, adjust the pH value of the reaction system to 4 to obtain a reaction solution , nitrogen gas to remove oxygen in the reaction system, after adding 0.04g of potassium persulfate, stop the nitrogen gas flow, seal the ziplock bag and place it in a water bath at 70°C for 1.5h to obtain lignin-METAC graft copolymer crude product.

[0041] The crude product was centrifuged and washed with absolute ethanol (3000r / min), and then dialyzed with a dialysis bag (MWCO: 3000Da) for 48h. Obtain lignin-METAC graft copolymer (referred to as L-M graft copolymer) through hot air drying.

[0042] Implementation prepares the reaction condition of L-M graft copolymer, and solubility and graft ratio are as follows:

[0043] Table 1:

[0044]

[0045] In the present invention, the graft copolymerization of lignin ...

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Abstract

The invention relates to a method for preparing a water-soluble cationic lignin-based flocculant by a semi-dry method, and belongs to the technical field of material science. The method comprises thefollowing steps: adding lignin into deionized water at room temperature, mixing with grafting monomer METAC solution, adjusting pH to 2-5 to obtain reaction solution; adding potassium persulfate intothe reaction solution under nitrogen atmosphere, and performing water bath reaction to obtain lignin-METAC grafting copolymer crude product; washing and dialyzing the obtained lignin-METAC grafting copolymer crude product to obtain the purified lignin-METAC grafting copolymer. The product obtained by the method is subjected to flocculation treatment on papermaking wastewater and emulsified oil-containing wastewater after being purified, so that a better treatment effect is obtained; meanwhile, the method is simple in process, less in water consumption, good in water solubility and cationicity,thereby achieving industrial production easily, and being a new way for high-value utilization of the lignin.

Description

technical field [0001] The invention relates to a semi-dry method for preparing a water-soluble cationic lignin-based flocculant, which belongs to the technical field of material science. Background technique [0002] my country is a country that lacks water resources. With the rapid development of the industrial level in recent years, the water consumption has also increased sharply. In order to avoid the harm of industrial production wastewater to the environment, the problem of wastewater treatment is becoming more and more serious. As a simple, economical and widely used water treatment method, flocculation treatment has received extensive attention. The principle of flocculant is to form a certain volume of flocs through the contact between suspended particles and colloids that are not easy to settle in wastewater, and through charge neutralization and adsorption bridging. Then, the flocs are removed by physical methods such as sedimentation and air flotation, so as t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/34C02F1/56
CPCC02F1/56C08F289/00C08F220/34
Inventor 郭延柱陈腾飞陈小红肖领平孙润仓
Owner DALIAN POLYTECHNIC UNIVERSITY
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