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Preparation method of high-solid-content cationic polyacrylamide emulsion

A polyacrylamide, high solid content technology, applied in the field of chemical preparation, can solve problems such as heat dissipation, and achieve the effects of reducing the polymerization speed, making the preparation process safe, and prolonging the polymerization time.

Inactive Publication Date: 2019-03-15
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the defects in the research of the above polyacrylamide emulsion, solves the problem of heat dissipation during the preparation of low molecular weight and high solid content cationic polyacrylamide emulsion, and provides a safe and reliable synthesis process, low molecular weight and high solid content cationic polyacrylamide emulsion preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 426 kilograms of acrylamide, 377 kilograms of deionized water, and 256 kilograms of methacryloyloxyethyl trimethyl ammonium chloride solution with a mass ratio of 80% to the preparation kettle, and stir evenly; add 390 kilograms of dearomatized hydrocarbons to the emulsifying kettle Solvent oil, 52 kg of Span 80, stir evenly; add the water phase prepared in the preparation kettle to the emulsification kettle for high-speed shear emulsification. After emulsification, add a solution containing 1200 g of ammonium persulfate, and heat the materials through a circulating water bath To 30°C, purge oxygen with high-purity nitrogen for 1 hour and keep stirring. After nitrogen and deoxygenation, 3% sodium bisulfite solution was added dropwise at a rate of 0.1 g / min for 3 hours. When the temperature of the material rises to the highest and the temperature drops to 40°C, the dropping is stopped, the temperature of the circulating water bath is increased, and the material Heat t...

Embodiment 2

[0019] Add 426 kilograms of acrylamide, 377 kilograms of deionized water, and 256 kilograms of methacryloyloxyethyl trimethyl ammonium chloride solution with a mass ratio of 80% to the preparation kettle, and stir evenly; add 390 kilograms of dearomatized hydrocarbons to the emulsifying kettle Solvent oil, 52 kg of Span 80, stir evenly; add the water phase prepared in the preparation kettle to the emulsification kettle for high-speed shear emulsification. After emulsification, add a solution containing 2000 g of ammonium persulfate, and heat the materials through a circulating water bath To 35°C, purge oxygen with high-purity nitrogen for 1 hour, keep stirring. After nitrogen and deoxygenation, 4% sodium bisulfite solution was added dropwise at a rate of 0.06 g / min for 3 hours. When the temperature of the material rises to the highest and the temperature drops to 40°C, the dropping is stopped, and the temperature of the circulating water bath is increased. Heat to 60°C, add a s...

Embodiment 3

[0021] Add 291 kilograms of acrylamide, 343 kilograms of deionized water, and 425 kilograms of acryloyloxyethyl trimethylammonium chloride solution with a mass ratio of 80% to the preparation kettle, and stir evenly; add 390 kilograms of isoparaffin oil to the emulsifying kettle , 30 kg of Span 80 and 22 kg of Arlacel 83, stir evenly; add the water phase prepared in the preparation kettle to the emulsification kettle for high-speed shear emulsification. After emulsification, add a solution containing 1500 g of potassium bromate, and heat the materials through a circulating water bath To 35°C, purge oxygen with high-purity nitrogen for 1 hour, keep stirring. After nitrogen and deoxygenation, a 2% sodium metabisulfite solution was added dropwise at a rate of 0.12 g / min for 4 hours. When the material temperature rises to the highest and the temperature drops to 40°C, the dropping is stopped, the circulating water bath temperature is increased, and the material is heated to At 50°C...

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Abstract

The invention discloses a preparation method of high-solid-content cationic polyacrylamide emulsion. The preparation method disclosed by the invention adopts a segmented initiation process, a 1 to 5 percent low-concentration reducing agent solution is slowly dropwise added in a redox stage to reduce the polymerization rate in the redox stage, the polymerization time is prolonged, and the problemsthat the synthesis of low-molecular-weight polyacrylamide emulsion cannot be initiated at a low temperature and requirements on the heat dissipation capability of equipment are high are solved. According to the preparation, the maximum temperature of the polymerization is controlled within a safe range by slowly dropwise adding the low-concentration reducing agent solution, so that a plenty of time is provided for dissipating the polymerization heat; furthermore, the conversion rate in the redox stage is increased, and the potential safety hazard in an azo initiation stage is eliminated. The low-molecular-weight high-solid-content cationic polyacrylamide emulsion product prepared by the preparation method can be widely applied to various sewage and sludge treatment fields.

Description

Technical field: [0001] The invention relates to a chemical preparation method, in particular to a preparation method of high solid content cationic polyacrylamide emulsion. Background technique: [0002] Acrylamide is easy to polymerize to obtain high-molecular-weight polymers. As a linear water-soluble polymer, polyacrylamide can be widely used in water treatment, papermaking, and oilfield exploitation. The preparation methods of polyacrylamide mainly include aqueous solution polymerization and inverse emulsion polymerization. Among them, inverse emulsion polymerization has the characteristics of easy heat diffusion, easy temperature control, high molecular weight and narrow distribution, and the obtained emulsion product can be dissolved instantaneously In water, compared with solid polyacrylamide products with long dissolution time and difficulty in uniformity, it is more convenient to apply. Therefore, it has become a research hotspot and is gradually applied in various fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F226/02C08F2/32
CPCC08F2/32C08F220/56C08F220/34C08F226/02
Inventor 滕大勇靳晓霞李燕伟徐俊英周立山滕厚开
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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