Unlock instant, AI-driven research and patent intelligence for your innovation.

Production of anion-polyacrylamide

A polyacrylamide and anionic technology, applied in the field of high molecular polymer manufacturing, can solve the problems of high pH value, high energy consumption, long process, etc., and achieve the effects of high molecular weight, simple process and good solubility.

Inactive Publication Date: 2010-05-19
上海恒谊化工有限公司 +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The post-polymerization hydrolysis process refers to the homopolymerization of acrylamide monomers. The polymerized rubber block is subjected to alkali kneading and thermal hydrolysis or the rubber block is granulated and then added to alkali-thermal hydrolysis to obtain anionic polyacrylamide. This method not only has a long process and a large investment, but also In actual operation, since the polyacrylamide rubber block is a poor conductor of heat, it is difficult to meet the temperature requirements and the hydrolysis is incomplete by heating and hydrolyzing through heat conduction. This process not only has low production efficiency, but also consumes a lot of energy.
Pre-adding alkali co-hydrolysis process refers to adding alkali before polymerization, and by controlling the pH value of the acrylamide aqueous solution polymerization system, the purpose of polymerization co-hydrolysis is achieved. Due to the addition of hydrolyzing agent alkali in the polymerization system in advance, the pH value of the system is biased. High, the conductivity increases, which is not conducive to the chain growth reaction of acrylamide free radical polymerization, so it is difficult to prepare high molecular weight polymers

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]Add 3750g of purified 40% acrylamide aqueous solution to a container lined with a high-pressure polyethylene film, add 250g of 1‰ polyacrylamide solution with a molecular weight of 3 million, 1000g of deionized water, freeze to 0°C, add 336g of Sodium carbonate powder, disodium edetate 0.15g, ammonium persulfate 0.075g, sodium bisulfite 0.075g, azo-bis-2-amidinopropane dihydrochloride 0.075g, azo-bis- 2-imidazolinylpropane dihydrochloride 0.025g, azo-bis-4-cyanovaleric acid 0.025g, azo-bis-(N-hydroxyethyl)-2-methylpropionamidine dihydrochloride 0.05g, stir evenly, blow nitrogen to drive oxygen for 15 minutes, and polymerize with ultraviolet radiation for 30 minutes. After the polymerization, put the rubber block in an oven at 80°C for 3 hours, then granulate, dry, and pulverize, and the main technical indicators of the obtained powdery anionic polyacrylamide are as follows:

[0026] Molecular weight: 27.6 million (GB12005.1-89 polyacrylamide intrinsic viscosity determin...

Embodiment 2

[0031] Add 1250g of 40% acrylamide aqueous solution treated with macroporous strong acid and strong base ion exchange resin into a container lined with high-pressure polyethylene film, add 100g of polyacrylamide solution with a molecular weight of 1‰3 million, and 650g of deionized water, and freeze to 0°C, add 140g coated anhydrous sodium carbonate powder, 0.05g disodium edetate, 0.05g ammonium persulfate, 0.05g sodium bisulfite, azo-bis-2-amidinopropane dihydrochloride 0.05g of salt, stir to disperse evenly, pass nitrogen to drive oxygen for 15 minutes, seal, and polymerize by ultraviolet radiation for 30 minutes. After the polymerization is completed, put the rubber block in an oven at 90° C. for 2 hours, and then granulate, dry, and pulverize to obtain an anionic polyacrylamide powder product. The main technical indicators tested are as follows:

[0032] Molecular weight: 15.68 million (the test method is the same as above, the same below);

[0033] Hydrolysis degree: 23...

Embodiment 3

[0037] Add 7,500g of purified 40% acrylamide aqueous solution to a container lined with a high-pressure polyethylene film, add 500g of 1‰ polyacrylamide solution with a molecular weight of 3 million, and 2,000g of deionized water to freeze to 2°C, add 1,680g of Coating treatment of anhydrous sodium carbonate powder, disodium edetate 0.3g, ammonium persulfate 0.15g, sodium bisulfite 0.15g, azo-bis-2-amidinopropane dihydrochloride 0.15g, azo - 0.05g of bis-2-imidazolinyl propane dihydrochloride, 0.10g of azo-bis-(N-hydroxyethyl)-2-methylpropionamidine dihydrochloride, nonylphenol polyoxyethylene ether 1.5g, stir evenly, pass nitrogen to drive oxygen for 15 minutes, seal, and polymerize by ultraviolet radiation for 30 minutes. After polymerization, put the rubber block in an oven at 100°C for 2.5 hours, then granulate, dry, and pulverize. The main technical indicators of the obtained powdery anionic polyacrylamide are as follows:

[0038] Molecular weight: 18.42 million;

[003...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle size (mesh)aaaaaaaaaa
alcoholysis degreeaaaaaaaaaa
degree of polymerizationaaaaaaaaaa
Login to View More

Abstract

Production of anion-polyacrylamide is carried out by adding coated hydrolytic reagent into acrylamide solution purified and frozen, agitating, inducing into nitrogen while repelling oxygen for 15-20mins, initiation polymerizing by ultraviolet radiation for 20mins-2hrs, dissolving for coated hydrolytic reagent, hydrolyzing, keeping temperature at 70-100degree for 2.0-3.0hrs, granulating, drying andcrushing to obtain the final product. It's simple, has high molecular weight, and excellent dissolvability. It can be used for water treatment, solid-liquid separation and third oil extraction.

Description

technical field [0001] The invention relates to a method for producing high molecular polymers, in particular to a method for producing anionic polyacrylamide applicable to technical fields such as sewage treatment, solid-liquid separation, ore dressing, and tertiary oil recovery. Background technique [0002] Anionic polyacrylamide is widely used in sewage treatment, solid-liquid separation, mineral processing, tertiary oil recovery and other technical fields. The molecular weight requirement is generally higher, usually between 5 million and 30 million. At present, the industrial production and preparation methods of anionic polyacrylamide mainly include: copolymerization process, post-polymerization hydrolysis process and pre-adding alkali co-hydrolysis process. The so-called copolymerization process refers to the copolymerization of acrylic acid monomers with acrylamide through alkali neutralization. Although this method does not require hydrolysis, it requires high puri...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/56C08F2/48C08F8/12
Inventor 袁洪海黄宝存
Owner 上海恒谊化工有限公司