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Method for synthesizing zwitter-ion polyacrylamide copolymer and application of prepared copolymer as flocculant

A polyacrylamide copolymer and amphoteric ion technology, which is applied in the field of industrial wastewater treatment, can solve the problems of unsuitable adjustment of the ratio of anions and cations, low relative molecular weight of the product, and difficult control of the product structure, so as to reduce the risk of passive parking and increase chemical stability Sex, the effect of reducing the activation energy of the reaction

Active Publication Date: 2014-04-02
NANJING CHENGZHI CLEAN ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the synthetic method of side group modification, the ratio of anions and cations should not be adjusted, and the method of adding post-treatment can only improve the performance of amphoteric polyacrylamide to a limited extent; the structure of the product is not easy to control in the method of graft polymerization, and the relative molecular weight of the product The disadvantage of low quality; the amphoteric monomer homopolymerization method and the zwitterionic ion pair copolymerization method are currently limited to laboratory research because of the difficulty in controlling the reaction. Therefore, the most widely used synthetic route in industry is the copolymerization of anion and cation monomers. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of synthetic method of zwitterionic polyacrylamide copolymer, comprises the following steps:

[0028] A) Configuration solution

[0029] The copolymerization reaction is carried out in a reactor with agitator. The monomer acrylamide, sodium methacrylate and dodecyl-p-vinylbenzyl ammonium chloride were respectively configured into aqueous solutions, wherein the mass fraction of acrylamide (M) was 40%, and dodecyl-p-vinylbenzyl chloride The mass fraction of ammonium chloride (N) is 40%, and the mass fraction of sodium methacrylate (MN) is 50%; the prepared monomer solution is added to the stirring tank in turn, and the molar ratio M:N:MN=1:2: 1 Add the number of monomers.

[0030] B) Add accelerator, add oxidant sodium persulfate and reducing agent sodium borohydride to the stirred tank, sodium persulfate oxidizing agent accounts for 0.05% of the total mass fraction of the monomer, and sodium borohydride reducing agent accounts for 0.1% of the total mass fraction...

Embodiment 2

[0035] The zwitterionic polyacrylamide copolymer prepared in Example 1 was used as a flocculant in the treatment of circulating black water in the coal gasification process.

[0036] Dissolve the zwitterionic polyacrylamide flocculant in a storage tank filled with water, stir for 30 minutes, and prepare an aqueous solution with a certain concentration, and pour it into the sedimentation tank through a plunger pump, and control the stroke of the plunger pump to adjust the addition of flocculant Quantity, samples were taken on the inlet and outlet pipelines of the sedimentation tank for analysis, and the suspended matter was measured by filtering and drying.

[0037] Experimental results:

[0038] Black water flow 250~300 m 3 / h, pH value 7~8

[0039] The concentration of flocculant amphoteric polyacrylamide is 250mg / L, and the amount of amphoteric polyacrylamide added is 5 m 3 / h

[0040] Black water feed SS concentration: 4200mg / L, black water discharge SS concentration: 5...

Embodiment 3

[0049] In Example 1, the molar addition ratio of acrylamide, dodecyl to vinyl benzyl ammonium chloride and sodium methacrylate was changed to 1:3:2, and different ionized The degree of amphoteric polyacrylamide is applied to the circulating black water treatment of the coal gasification process according to the method described in Example 2.

[0050] Experimental results:

[0051] Black water flow 250~300 m 3 / h, pH value 7~8

[0052] The concentration of flocculant amphoteric polyacrylamide is 250mg / L, and the amount of amphoteric polyacrylamide added is 5 m 3 / h

[0053] Black water feed SS concentration: 4800mg / L, black water discharge SS concentration: 20-40 mg / L.

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Abstract

The invention discloses a method for synthesizing a zwitter-ion polyacrylamide copolymer. Synthesis is carried out by a solution copolymerization process, alkyl diethyl benzyl ammonium chloride is used as a cation monomer, sodium methacrylate is used as an anion monomer, and acrylamide is used as an auxiliary raw material. The method comprises the following steps: A) adding a water solution of the acrylamide, the sodium methacrylate and the alkyl diethyl benzyl ammonium chloride to a stirred tank; B) adding an accelerant and sequentially adding sodium sulfate and sodium borohydride to the stirred tank; C) heating a reactor and carrying out copolymerization reaction at a nitrogen atmosphere; D) separating and drying a product to obtain a target material. The synthesizing method has the advantages that the salt tolerance and the temperature resistance of the copolymer can be increased, and the structural stability of the copolymer can be improved; meanwhile, the zwitter-ionization degree of the copolymer can be changed through the adjustment of the adding ratio of the cation monomer to the anion monomer so as to adapt to different application fields. The invention further relates to an application of the zwitter-ion polyacrylamide copolymer which is prepared by the method as a flocculant.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and specifically relates to a method for synthesizing amphoteric polyacrylamide through an anion-cation monomer copolymerization method, and the application of the prepared copolymer as a flocculant, thereby improving the flocculation and precipitation effect of industrial wastewater. Background technique [0002] According to the degree of ionization, polyacrylamide can be divided into anionic type, cationic type, nonionic type and amphoteric type. Molecules, compared with water-soluble cationic or anionic polyacrylamide containing only one kind of charge, amphoteric polyacrylamide not only has the properties of both, but also has the characteristics of obvious electrolyte effect and wide application range of pH value, so it is widely used. The attention of relevant researchers at home and abroad, its unique chemical structure leads to its unique physical and chemical pro...

Claims

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Application Information

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IPC IPC(8): C08F212/14C08F220/56C08F220/06C08F4/40C02F1/56
Inventor 涂峰赵静江山王德维沈应来张金勇
Owner NANJING CHENGZHI CLEAN ENERGY CO LTD
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