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Synthesis method for anionic polyacrylamide

A technology of polyacrylamide and synthesis method, which is applied in the direction of flocculation/sedimentation water/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. It can solve the problems of long polymerization initiation time, increased production cost, long polymerization time, etc., and achieves The effect of short initiation polymerization time, reduction of production cost, and simplification of production process

Inactive Publication Date: 2012-07-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these synthesis methods, most of them are initiated by heating, and their main disadvantages are: 1. The polymerization initiation time is long, such as the patent "preparation method of anionic polyacrylamide" with the publication number CN101735387A, which is prepared by polymerization Anionic polyacrylamide is obtained, which takes 1h to 5h, and the initiation of polymerization takes a long time
Another example is the patent "Synthesis of a high-molecular-weight instant anionic polyacrylamide" with the publication number CN102002123A. It is an anionic polyacrylamide obtained through adiabatic polymerization reaction, which takes 6h to 8h, and the polymerization time is also relatively long.
2. The temperature needs to be controlled during the initiation process, usually by heating or cooling, which increases the production cost and consumes too much energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The first step, weigh 5.0g of monomer acrylamide, 2.0g of acrylic acid and 2.0g of 2-acrylamido-2-methylpropanesulfonic acid and put them into a jar, add 0.1% urea and 0.4% disodium edetate, add 51g of deionized water, stir evenly, and prepare an aqueous solution whose mass concentration of total monomer is 15%;

[0018] In the second step, add sodium hydroxide-potassium dihydrogen phosphate solution to the monomer aqueous solution prepared above, and stir evenly to adjust the pH value of the system to 3; pass high-purity nitrogen into the solution to remove oxygen, and quickly add A solution of potassium persulfate as an oxidizing agent and sodium sulfite as a reducing agent with 0.4% of the total mass of the monomer is stirred evenly and sealed, wherein the mass ratio of the oxidizing agent to the reducing agent is 1:1;

[0019] The third step is to put the above-mentioned prepared mixture into the ultraviolet light reaction device at the indoor ambient temperature, a...

Embodiment 2

[0023] In the first step, weigh 6.0 g of monomer acrylamide, 1.0 g of acrylic acid and 2.0 g of 2-acrylamido-2-methylpropanesulfonic acid in a jar, add 0.3% urea and 0.2 % of disodium edetate, add deionized water 27g, stir, and the mass concentration of preparing total monomer is an aqueous solution of 30%;

[0024] In the second step, add potassium hydroxide-potassium dihydrogen phosphate solution to the monomer aqueous solution prepared above, and stir evenly to adjust the pH value of the system to 6; pass high-purity nitrogen into the solution to remove oxygen, and quickly add Stir evenly and seal with 0.4% oxidizing agent ammonium persulfate solution and reducing agent sodium sulfite solution of 0.4% of the total mass of monomers, wherein the mass ratio of oxidizing agent to reducing agent is 1.5:1;

[0025] The third step is to put the above-prepared mixture into the ultraviolet light reaction device at the indoor ambient temperature, and carry out the polymerization reac...

Embodiment 3

[0029] In the first step, weigh 7.0 g of monomer acrylamide, 1.0 g of acrylic acid and 1.0 g of 2-acrylamido-2-methylpropanesulfonic acid in a jar, add 0.2% urea and 0.15 % of disodium ethylenediaminetetraacetic acid, add deionized water 13.5g, stir evenly, prepare the aqueous solution that the mass concentration of total monomer is 40%;

[0030] In the second step, add sodium hydroxide-sodium dihydrogen phosphate solution to the monomer aqueous solution prepared above, and stir evenly to adjust the pH value of the system to 7; pass high-purity nitrogen into the solution to remove oxygen, and quickly add Mix 0.2% oxidizing agent ammonium persulfate solution and reducing agent sodium bisulfite solution with 0.2% of the total mass of monomers, stir evenly, and seal, wherein the mass ratio of oxidizing agent and reducing agent is 2:1;

[0031] The third step is to put the above-prepared mixture into the ultraviolet light reaction device at the indoor ambient temperature, and carr...

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PUM

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Abstract

The invention relates to a synthesis method for anionic polyacrylamide. The synthesis method comprises the following steps of: adding a solubilizer and a chelant to three monomer aqueous solutions of acrylamide (AM), acrylic acid (AA) and 2-acryloyl-2-methyl-propyl sulfonate (AMPS); regulating the pH value of the reaction system with a buffer solution; successively adding an oxidizing agent and a reducing agent under the protection of nitrogen; introducing nitrogen for a period of time continuously; stopping introduction of the nitrogen and sealing; and initiating a polymerization reaction under the irradiation of ultraviolet light of certain wave length to generate gommures. The polymerization initiating time of the synthesis method is short, and heating or cooling control is not needed, so that the production process is simplified, the energy consumption is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for synthesizing an aqueous solution polymer, in particular to a method for synthesizing an anionic polyacrylamide. Background technique [0002] Polyacrylamide (PAM), as a kind of water-soluble polymer with special functions, has excellent physical properties, such as thickening, flocculation and sedimentation, filtration, resistance reduction, stabilization, viscosity increase, retention and purification, etc. According to the ionic characteristics, it can be divided into four types: non-ionic (NPAM), anionic (APAM), cationic (CPAM) and amphoteric. It is widely used in petroleum, water treatment, papermaking, mineral processing, coal washing, medicine, chemical industry, textile, agriculture and Water conservancy and other fields have broad application prospects. [0003] At present, the synthesis methods of anionic polyacrylamide in my country are mainly divided into: homopolymerization post hydrolysis method, homo...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F2/48C02F1/56C02F11/14
Inventor 郑怀礼卢伟马江雅陈雨喆魏占超陈伟孙永军
Owner CHONGQING UNIV
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