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Lignin-based polyquatemary salt cation water treatment agent and preparation method thereof

A lignin-based, cationic water technology, used in water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. It solves problems such as the removal of stable suspended solids and the difficulty of designing or regulating molecular structure, so as to achieve the effect of narrow molecular weight distribution, improved flocculation and sedimentation effect, and large molecular weight.

Active Publication Date: 2018-11-06
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Some anionic surfactants prepared in the above-mentioned disclosed documents are not suitable for the removal of negatively charged suspended solids in sewage; although there are also many documents that have prepared water treatment agents for lignin quaternary ammonium salt cations, due to the prepared The molecular weight of the water treatment agent is low, and the molecular structure is difficult to design or control, which limits the further improvement of its flocculation performance. Therefore, it is necessary to develop a new type of high-efficiency lignin water treatment agent

Method used

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  • Lignin-based polyquatemary salt cation water treatment agent and preparation method thereof
  • Lignin-based polyquatemary salt cation water treatment agent and preparation method thereof
  • Lignin-based polyquatemary salt cation water treatment agent and preparation method thereof

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Embodiment 1

[0034] A preparation method of a lignin-based polyquaternium cationic water treatment agent, specifically comprising the following steps:

[0035] (1) Dissolve 0.32 mol of potassium ethyl xanthate in 100 mL of N,N-dimethylformamide (DMF), cool in an ice bath for 2 hours, then slowly add equimolar 2-bromopropionic acid dropwise, and stir at room temperature Overnight, filter to remove the white precipitate, extract the filtrate with 250 mL of ether, then wash the ether layer repeatedly with deionized water for 3 times, add anhydrous magnesium sulfate to the extract and dry overnight, filter, remove the solvent by rotary evaporation and place it in the refrigerator to cool to obtain light Yellow crystal 2-(ethoxythiomethyl)thiopropionic acid;

[0036] (2) According to the substance ratio of wood pulp alkali lignin: 2-(ethoxythiomethyl)thiopropionic acid: N,N-dicyclohexylcarbodiimide: 4-dimethylaminopyridine is 1 :1:1:0.3 ratio, weigh 0.05mol of wood pulp alkali lignin and disso...

Embodiment 2

[0039] A preparation method of a lignin-based polyquaternium cationic water treatment agent, specifically comprising the following steps:

[0040] (1) Dissolve a certain amount of potassium ethyl xanthate in N,N-dimethylformamide (DMF), cool in an ice bath for 2 hours, then slowly add an equimolar amount of 2-bromopropionic acid dropwise, at room temperature Stir overnight, filter to remove the white precipitate, extract the filtrate with an appropriate amount of ether, then repeatedly wash the ether layer 4 times with deionized water, add anhydrous magnesium sulfate to the extract and dry overnight, filter, remove the solvent by rotary evaporation and place it in the refrigerator to cool to obtain Yellow crystal 2-(ethoxythiomethyl)thiopropionic acid;

[0041] (2) According to the substance ratio of bamboo pulp alkali lignin: 2-(ethoxythiomethyl)thiopropionic acid: N,N-dicyclohexylcarbodiimide: 4-dimethylaminopyridine is 1 :2:2:0.1 ratio, weigh 0.05mol of wood pulp alkali li...

Embodiment 3

[0044] A preparation method of a lignin-based polyquaternium cationic water treatment agent, specifically comprising the following steps:

[0045] (1) Dissolve 0.32 mol of potassium ethyl xanthate in 100 mL of N,N-dimethylformamide (DMF), cool in an ice bath for 2 hours, then slowly add equimolar 2-bromopropionic acid dropwise, and stir at room temperature Overnight, filter to remove the white precipitate, extract the filtrate with 250 mL of ether, then wash the ether layer repeatedly with deionized water for 5 times, add anhydrous magnesium sulfate to the extract and dry overnight, filter, remove the solvent by rotary evaporation, and place it in the refrigerator to cool to obtain light Yellow crystal 2-(ethoxythiomethyl)thiopropionic acid;

[0046] (2) According to the substance ratio of grass pulp alkali lignin: 2-(ethoxythiomethyl)thiopropionic acid: N,N-dicyclohexylcarbodiimide: 4-dimethylaminopyridine is 1 :3:3:0.2 ratio, weigh 0.05mol of grass pulp alkali lignin and di...

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Abstract

The invention relates to the technical field of a sewage treatment material, in particular to a lignin-based polyquatemary salt cation water treatment agent and a preparation method thereof. The method is characterized in that potassium ethyl xanthogenate and 2-bromopropionic acid are used as raw materials for preparing 2-(ethoxythiomethyl) thiodipropionic acid; then, the 2-(ethoxythiomethyl) thiodipropionic acid and alkali lignin or lignin derivatives are synthetized into a lignin-based RAFT chain transfer agent through esterification reaction; finally, under the effects of a radical initiator and the lignin-based RAFT chain transfer agent, methacryloyloxyethyl trimethyl ammonium chloride is polymerized to obtain a star-shaped multi-arm lignin-based polyquatemary salt cation water treatment agent through free radical active polymerization. The method has the characteristics that the conversion rate is high; the molecular weight is great; the molecular weight distribution is narrow; the reaction conditions are mild; the target product structure can be designed, regulated and controlled according to the flocculating performance; the flocculating efficiency is high. The prepared water treatment agent can be widely applied to the removal of suspension solid particles difficult to settle in domestic sewage and industrial sewage.

Description

technical field [0001] The invention relates to the technical field of sewage treatment materials, in particular to a preparation method of a lignin-based polyquaternium cationic water treatment agent. Background technique [0002] Lignin is a natural phenolic polymer with a three-dimensional structure, and it is the second largest natural organic compound after cellulose in nature. At present, the available industrial lignin mainly comes from the pulp and paper industry, and can be divided into insoluble alkali lignin and soluble lignosulfonate according to different pulping processes. Under the action of alkali, lignin undergoes a certain degree of alkaline hydrolysis to increase its solubility, and is extracted, separated by precipitation, and the obtained lignin is called alkali lignin. The pulp and paper industry worldwide separates about 140 million tons of cellulose from plants each year, while producing about 50 million tons of industrial lignin. So far, only about...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56
CPCC02F1/5263C02F1/56
Inventor 刘祖广卢祥谢俊康雷福厚
Owner GUANGXI UNIV FOR NATITIES
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