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Preparation method of ternary copolymerized amphoteric polyacrylamide

A technology of ternary copolymerization of amphoteric and polyacrylamide, which is applied in the preparation of organic compounds, chemical instruments and methods, preparation of amino hydroxyl compounds, etc., can solve the problems of poor flocculation effect and slow dissolution rate of fracturing wastewater, and achieve optimal Excellent treatment effect, good adsorption performance, and wide range of applicable pH

Inactive Publication Date: 2018-03-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing quaternary ammonium polyacrylamide flocculants, which have a slow dissolution rate and poor flocculation effect on oil and gas field fracturing wastewater, and provide a polyacrylamide flocculant with good dissolution effect and good flocculation effect. flocculant; and provide the preparation and purification method of this polyacrylamide flocculant

Method used

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  • Preparation method of ternary copolymerized amphoteric polyacrylamide
  • Preparation method of ternary copolymerized amphoteric polyacrylamide
  • Preparation method of ternary copolymerized amphoteric polyacrylamide

Examples

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Embodiment 1

[0038] The preparation of the present embodiment ternary copolymerization amphoteric polyacrylamide is prepared according to the following steps:

[0039] (1) Preparation of quaternary ammonium salt cationic monomer (AHPTAC):

[0040] Add 15 mL of absolute ethanol and 0.05 mol of acrylic acid (AA) into the three-necked flask, and slowly add 0.05 mol of NaOH saturated aqueous solution dropwise under stirring conditions. After 5 min, 0.065 mol of 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC) aqueous solution (60% by mass fraction) was slowly added dropwise. After the dropwise addition, water was added to make the reaction system satisfy V (absolute ethanol): V (water) = 1:1. The temperature was raised to 55°C and the reaction temperature was maintained for 4h. Cool to room temperature after the reaction, and distill under reduced pressure to remove absolute ethanol to obtain crude AHPTAC. Add isopropanol to the obtained AHPTAC crude product to dissolve AHPTAC an...

Embodiment 2

[0046] The steps for preparing terpolymer amphoteric polyacrylamide in this example are the same as those in Example 1 except that the following steps are different:

[0047] (1) Preparation of quaternary ammonium salt cationic monomer (AHPTAC):

[0048] Add 15 mL of acetonitrile and 0.05 mol of acrylic acid (AA) into the three-neck flask, and slowly add 0.05 mol of NaOH saturated aqueous solution dropwise under stirring conditions. After 5 min, 0.055 mol of 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC) aqueous solution (60% by mass fraction) was slowly added dropwise. After the dropwise addition, water was added to make the reaction system satisfy V (absolute ethanol): V (water) = 1:1. The temperature was raised to 65°C and the reaction temperature was maintained for 4.5h. Cool down after the reaction, and distill under reduced pressure to remove the solvent to obtain the crude product of AHPTAC. Add absolute ethanol to the obtained AHPTAC crude product to di...

Embodiment 3

[0052] The steps for preparing terpolymer amphoteric polyacrylamide in this example are the same as those in Example 1 except that the following steps are different:

[0053] (1) Preparation of quaternary ammonium salt cationic monomer (AHPTAC):

[0054] Add 15 mL of isopropanol and 0.05 mol of acrylic acid (AA) into the three-neck flask, and slowly add 0.05 mol of NaOH saturated aqueous solution dropwise under stirring conditions. After 5 min, 0.055 mol of 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTAC) aqueous solution (60% by mass fraction) was slowly added dropwise. After the dropwise addition, water was added to make the reaction system satisfy V (absolute ethanol): V (water) = 1:1. The temperature was raised to 75°C and the reaction temperature was maintained for 6h. Cool down after the reaction, and distill under reduced pressure to remove the solvent to obtain the crude product of AHPTAC. Add absolute ethanol to the obtained AHPTAC crude product to disso...

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Abstract

The invention belongs to the technical field of flocculant preparation, and relates to a preparation method of ternary copolymerized amphoteric polyacrylamide, wherein the preparation method comprisesthe steps: firstly, preparing a novel cationic monomer AHPTAC, mixing and dissolving the monomer with other two monomers of AM and AMPS, deoxidizing, then adding an initiator, heating up, after a reaction is completed, cooling, dropwise adding the obtained water dispersed system into absolute ethyl alcohol, precipitating, washing, filtering and drying, and crushing to obtain a white solid product. The total mass of the three monomers is 20% of the total mass of the system, and the molar ratio of AM to AHPTAC to AMPS is 1 to 3 to (1-4); the initiator is one or two of VA-044 and ammonium persulfate-sodium bisulfite; the adding amount of the initiator is 0.2% of the total mass of the three monomers. The preparation method is simple to operate, and the prepared ternary copolymerized amphoteric polyacrylamide has high molecular weight and excellent performance of controllable cationic degree, and has the advantages of better solubility, wide applicable pH range and better flocculation effect.

Description

technical field [0001] The invention belongs to the technical field of flocculant preparation in sewage treatment, in particular, relates to a preparation method of ternary copolymerization amphoteric polyacrylamide and its application as a flocculant in sewage treatment, especially suitable for oil and gas field fracturing sewage treatment, In particular, it relates to a preparation method of a polymerizable quaternary ammonium salt cationic monomer. Background technique [0002] Polyacrylamide flocculants can form hydrogen bonds in water because of the amide groups in their structural units; during flocculation, the small particles in the sewage are aggregated to form large particles through bridging adsorption, electrical neutralization, etc., and then form flocs to settle. To achieve the purpose of separating pollutants from water. Polyacrylamide flocculants are mainly organic polymer flocculants obtained by homopolymerization of polyacrylamide under the action of an in...

Claims

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Application Information

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IPC IPC(8): C08F220/36C08F220/58C08F220/56C08F2/10C07C213/06C07C219/08C02F1/52C02F1/56
CPCC02F1/52C02F1/56C07C213/06C08F2/10C08F220/36C08F220/58C08F220/585C07C219/08C08F220/56
Inventor 姜翠玉王芳李梅翟帅磊王鲁凯王彦
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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