Method for quickly and continuously preparing high-molecular-weight polyacrylamide

A technology of polyacrylamide and polyacrylamide copolymer, which is applied in the field of rapid and continuous preparation of water-soluble polymers and rapid and continuous reaction of polyacrylamide, which can solve the problems of difficult heat transfer of PAM colloid, prolonged reaction time and complicated production process and other problems, to achieve the effect of improving labor productivity, simple equipment, and narrow molecular weight distribution

Inactive Publication Date: 2014-02-05
DALIAN RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN1448414A discloses a continuous aqueous solution polymerization process of polyacrylamide. Although this process solves the problem of heat dissipation, it needs to prolong the reaction time to improve the conversion rate of monomers. In addition, water heat transfer is used, and the monomer solution must be encapsulated in plastic thin film, resulting in complex production process
[0006] Since the generated PAM colloid is not easy to conduct heat, in order to reduce monomer residues, the traditional aging time is long. Therefore, we introduce microwaves with uniform heating into the continuous device

Method used

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  • Method for quickly and continuously preparing high-molecular-weight polyacrylamide

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Experimental program
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Effect test

Embodiment 1

[0028] Add 2000.00 g of 50% AM solution, 40.00 g of urea, 0.30 g of disodium edetate, 0.60 g of isopropanol, and 1930.00 g of deionized water into the batching tank. After deoxygenating with nitrogen for 30 minutes, add 20.00 g 1% ammonium persulfate solution is added to the batching tank, and nitrogen is continued for 10 minutes. The mixed solution and 10.00 g of 1% sodium bisulfite solution are distributed at a certain flow rate to a continuous nitrogen-filled device that rotates at a certain speed Above, react for 50 min under normal temperature and microwave conditions, and finally obtain a colorless transparent colloidal PAM after granulation, drying and crushing to obtain a white powder. After drying, the molecular weight of the powder is 10.435 million, the dissolution time is 150 minutes, and the residual monomer content is 0.04%.

Embodiment 2

[0030] Add 50% AM solution 2000.00 g, 40.00 g urea, 0.30 g disodium edetate, 0.60 g isopropanol, 0.20 g triethylamine and 1930.00 g deionized water into the batching tank, and ventilate nitrogen to remove oxygen After 30 minutes, 20.00 g of 1% ammonium persulfate solution and the solution in the batching tank were distributed at a certain flow rate to a continuous nitrogen-filled device rotating at a certain speed, and reacted for 50 minutes. Finally, a colorless transparent colloidal PAM was obtained. After granulation, drying and crushing, a white powder is obtained. The obtained powder polymer has a molecular weight of 8.089 million, a dissolution time of 120 minutes, and a residual monomer content of 0.04%.

Embodiment 3

[0032] Mix 1700.00 g of 50% AM solution, 1935.00 g of acryloxyethyl trimethylammonium chloride (DAC, 80%), 120.00 g of urea, 0.96 g of disodium edetate, 0.50 g of isopropanol, and 4238.00 g Deionized water is added to the batching tank. After deoxygenating with nitrogen for 30 minutes, add 20 g of 1% ammonium persulfate solution to the batching tank and continue to bubbling with nitrogen for 10 minutes. This solution is combined with 10 g of 1% hydrogen sulfite. Sodium is distributed at a certain flow rate to a continuous nitrogen-filled device rotating at a certain speed, and reacted for a certain period of 55 minutes under normal temperature and microwave conditions. Finally, a colorless transparent colloidal PAM is obtained after granulation, drying and pulverization. White powder. The molecular weight of the powder is 13.45 million, the dissolution time is 120 minutes, and the residual monomer content is 0.02%.

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Abstract

The invention relates to a method for quickly and continuously preparing high-molecular-weight polyacrylamide. According to the method, microwaves are introduced into a belt type reactor, so that the problems that during a kettle type reaction, the heat of polymerization is difficult to discharge, a colloid is difficult to take out and the monomer residual volume is high are solved, and the microwaves are favorable for improving the production efficiency of polyacrylamide. The method has the main technical features that an acrylamide (AM) aqueous solution or an AM aqueous solution, a comonomer aqueous solution, an auxiliary agent, a chain transfer agent and the like are added into a blending tank according to a certain mass ratio, the blending tank is adjusted to a certain temperature, nitrogen is inflated to remove oxygen for a certain period of time, then the solution in the blending tank and an initiating agent solution are continuously added to a conveying belt at a certain speed, and a continuous polymerization reaction is performed by controlling the temperature, wherein the conveying belt is subjected to oxygen removal by using nitrogen and runs at a certain speed. A formed polymer colloid is subjected to pelletizing, drying and crushing to obtain white polymer powder with high molecular weight and good water solubility. The method disclosed by the invention is simple in process, has the advantages of environmental protection and energy conservation, and can greatly improve the production efficiency and reduce the production cost.

Description

technical field [0001] The invention relates to a method for rapid and continuous preparation of water-soluble polymers, in particular to the rapid and continuous reaction of polyacrylamide. The prepared polyacrylamide is mainly used in the water treatment industry to achieve the purpose of protecting the environment and saving water. It belongs to the field of chemical technology. [0002] Background technique [0003] Polyacrylamide is a general term for homopolymers and copolymers of acrylamide and its derivatives. Generally, polymers containing more than 50% acrylamide monomers are generally referred to as polyacrylamide in industry. Aqueous solution polymerization is the earliest production method of polyacrylamide adopted in industry and is still used today. It has the characteristics of simple operation, high polymer yield, safety and low environmental pollution. [0004] The bulk polymerization kettle is the simplest and most commonly used equipment for aqueous so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08F120/56C08F220/56C08F2/38C08F4/40C08F4/04C08F2/01
CPCY02P20/10
Inventor 高玉荣邵玉昌左洪亮陈曲
Owner DALIAN RES & DESIGN INST OF CHEM IND
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