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A cationic lignin-based flocculant and its preparation method and application

A cationic lignin and flocculant technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of single function of flocculant, long reaction time, low flocculation efficiency, etc. The effect of increasing the positive charge density

Active Publication Date: 2020-09-11
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the lignin-based flocculants prepared by grafting reaction in the above-mentioned prior art are initiated by initiators. This initiation method usually has the disadvantages of complicated steps, long reaction time, many side reactions, and the need for heating and condensing equipment; and the function of flocculants Single, low flocculation efficiency, most of them can only treat one type of wastewater, which is not conducive to the promotion of industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a preparation method of a cationic lignin-based flocculant, which includes the following steps:

[0032] 1) Add 1 g of lignosulfonate into 110 mL of deionized water, stir at 100 rpm for 2 min to make it dissolve evenly, and then adjust the pH value of the solution to 5.5 with hydrochloric acid solution (1M).

[0033] 2) To the solution obtained in step 1), add monomer METAC (the mass ratio of it to lignosulfonate is 1:4) and photoinitiator 2-hydroxy-4-(2-hydroxyethoxy) - 2-methylpropiophenone (the mass ratio of it to lignosulfonate is 10:1), stirred at 100rpm for 3min to dissolve it completely.

[0034] 3) Add the solution obtained in step 2) into a three-neck quartz photocatalytic reaction device with 254nm ultraviolet light (Shanghai Jiguang Special Lighting Electric Appliance Factory) and feed nitrogen (99.99% purity) to drive away oxygen, and turn on the ultraviolet lamp after 15 minutes (35W) and the graft polymerization of lignosulfonate ...

Embodiment 2

[0039] 1) Add 1 g of lignosulfonate into 80 mL of deionized water, stir at 150 rpm for 2 min to make it dissolve evenly, and then adjust the pH value of the solution to 2.5 with hydrochloric acid solution (1M).

[0040] 2) To the solution obtained in step 1), add monomer METAC (the mass ratio of it to lignosulfonate is 1:5) and photoinitiator 2-hydroxy-4-(2-hydroxyethoxy) - 2-methylpropiophenone (the mass ratio of it to lignosulfonate is 5:2), stirred at 200rpm for 5min to dissolve completely.

[0041] 3) Add the solution obtained in step 2) into a three-neck quartz photocatalytic reaction device with 254nm ultraviolet light (Shanghai Jiguang Special Lighting Electric Appliance Factory) and feed nitrogen (99.99% purity) to drive away oxygen, and turn on the ultraviolet lamp after 15 minutes (28W) and the graft polymerization of lignosulfonate and monomer METAC under the irradiation of ultraviolet light for 3h.

[0042] 4) After the reaction is finished, the solution obtained ...

Embodiment 3

[0046] 1) Add 1 g of lignosulfonate into 110 mL of deionized water, stir at 100 rpm for 2 min to make it dissolve evenly, and then adjust the pH value of the solution to 9 with sodium hydroxide solution (1M).

[0047] 2) To the solution obtained in step 1), add monomer DADMAC (the mass ratio of it to lignosulfonate is 1:4) and 2-hydroxy-4-(2-hydroxyethoxy)-2- The methylpropiophenone-sensitive initiator (the mass ratio of it to the lignosulfonate is 10:3) was stirred at 100rpm for 3min to completely dissolve it.

[0048] 3) Add the solution prepared in step 2) into a three-necked quartz photocatalytic reaction device with 254nm ultraviolet light (Shanghai Jiguang Special Lighting Electric Appliance Factory) and pass in nitrogen gas (99.99% purity) to drive away oxygen, and turn on the ultraviolet light after 15 minutes. Lamp (15W) and under the irradiation of ultraviolet light, lignosulfonate and monomer DADMAC undergo graft polymerization reaction for 3h.

[0049] 4) After th...

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Abstract

The invention relates to a cationic lignin-based flocculant as well as a preparation method and an application thereof, and the method comprises the following steps: adding lignosulfonate into deionized water, stirring and dissolving, and then adjusting the pH value of the mixture by using a hydrochloric acid solution or a sodium hydroxide solution; adding a monomer and a photoinitiator into the solution, and stirring to dissolve the monomer and the photoinitiator; introducing nitrogen into the obtained solution to expel oxygen, and after 5-30 minutes, carrying out a graft polymerization reaction on lignosulfonate and a monomer under the irradiation of ultraviolet light; after the reaction is finished, dropwise adding into an ethanol solution, stirring, performing standing for precipitation, and reserving precipitate; and washing the precipitate with a mixed solution of ethanol and acetone, and drying to obtain the cationic lignin-based flocculant. According to the method, the short-wave ultraviolet light is used for initiating the graft copolymerization reaction of the lignosulfonate and the unsaturated quaternary ammonium salt monomer, so that the method is short in reaction time, simple to operate, environment-friendly, energy-saving, easy to industrialize and easy to control in reaction, and can be used for preparing special flocculants for different types of sewage.

Description

technical field [0001] The invention belongs to the fields of modification of lignin and preparation of water treatment agents, and in particular relates to a cationic lignin-based flocculant for preparing and treating different types of waste water by controlling reaction conditions, a preparation method and application thereof. Background technique [0002] Water is the source of life and the material basis for the survival of all living things on earth. However, with the rapid development of economic globalization and human society, the problem of water resources is becoming more and more serious. About 1.2 billion people worldwide do not have access to safe drinking water, and millions of people die each year from drinking unsafe water. Therefore, how to efficiently treat and utilize sewage is a common problem faced by the whole world today. Flocculation is an efficient method for treating sewage, and flocculant and its application are the core of this technology. How...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56
CPCC02F1/56
Inventor 孙润仓陈月英王双飞施晓旦宋国勇王斌袁同琦
Owner DALIAN POLYTECHNIC UNIVERSITY
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