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Process for producing polyacrylamide hydrosol

A technology of polyacrylamide and production process, which is applied in the field of flocculant preparation, can solve the problems of large investment, poor product quality, unfavorable promotion and application, etc., and achieve the effect of low production cost, good quality and simple production process

Inactive Publication Date: 2010-07-14
四川银宇化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the existing production process, the investment is large, the equipment and production conditions are high, but the product quality is not good, it does not meet the needs of environmental protection and industrial development, and it is not conducive to popularization and application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Add 200 kg of 30% acrylamide aqueous solution into the polymerization kettle, then add 800 kg of tap water, and add 5 kg of NH sequentially while stirring 4 HCO 3 , 300ml with H 2 N(C 2 H 4 NH) n Aqueous solution of vinylamine with H structure, n=3; 0.06 kg (NH 4 ) 2 S 2 O 8 , 0.08 kg of NaHSO 3 ; Add 1 kg of CH 3 COOH: After adding the above materials, stir evenly, and the temperature is not less than 5 ℃, statically initiate polymerization for 6 hours to obtain a colorless and transparent polyacrylamide hydrosol. According to the GB / T13940-92 standard, the intrinsic viscosity is 1215g / ml, press [n]=3.73×10 -5 (M) 0.66 The calculated molecular weight is M=6.88 million. The solid content is 6%. The concentration of the vinylamine aqueous solution is above 98%, and the CH 3 The purity of COOH crystals is above 98%.

Embodiment 2

[0010] Add 920 liters of tap water into the polymerization kettle, add 80 kg of acrylamide crystals with a purity of 98% under stirring, and after dissolving, add 3 kg of NH sequentially 4 HCO 3 , 200ml with H 2 N(C 2 H 4 NH) n Aqueous solution of vinylamine with H structure, n=1; 0.1 kg of (NH 4 ) 2 S 2 O 8 , 0.1 kg of NaHSO 3 ; Add 2 kg of CH 3 COOH: After the above materials are added, stir evenly, at room temperature, statically initiate polymerization for 14 hours to obtain a colorless and transparent polyacrylamide hydrosol. According to GB / T13940-92 standard, the intrinsic viscosity is 1400 g / ml, press [n]=3.73×10 -5 (M) 0.66 The calculated molecular weight is M=8.53 million. The solid content is 8%. The concentration of the vinylamine aqueous solution is above 98%, and the CH 3 The purity of COOH crystals is above 98%.

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PUM

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Abstract

The invention relates to a process for producing polyacrylamide hydrosol, which is characterized by comprising the following steps: preparing 4 to 30 percent aqueous solution from 98 percent acrylamide crystal in a polymerization kettle by using tap water; and adding 0.1 to 15 percent of NH4HCO3, 0.01 to 2 percent of solution of vinyl amine with H2N(C2H4NH)nH structure, 0.001 to 5 percent of (NH4)2S2O8, 0.001 to 5 percent of NaHSO3 and 0.2 to 10 percent of CH3COOH into the aqueous solution in turn with stirring, stirring the mixture uniformly after the materials are fully added, and performing static initiated polymerization for 4 to 20 hours (the percentage range of the raw materials added with stirring in turn is relative to the percentage range of the mass of the acrylamide crystal) at the temperature of no less than 5 DEG C to obtain a polyacrylamide hydrosol flocculating agent product. The molecular weight is generally between 6 million and 12 million. The process does not need heating equipment, deionized water equipment or pure N2, so the investment is economic and the cost is low.

Description

Technical field [0001] The invention belongs to a preparation method of a water purifying agent for environmental protection and a flocculant for solid-liquid separation in an industrial process, and specifically relates to a production process of polyacrylamide hydrosol. Background technique [0002] Regarding water purification treatment, sewage treatment and sludge dehydration treatment, my country began to produce organic polymer flocculant polyacrylamide hydrosol in the early 1960s, but it is necessary to refine acrylamide with ion exchange resin columns, and boilers are also required. The acrylamide aqueous solution is heated to about 60℃, and pure N is added 2 The molecular weight of the product obtained by removing dissolved oxygen and adding an appropriate amount of redox agent for polymerization is generally around 3 million, and it is difficult to reach a product greater than 5 million. However, for polyacrylamide as a flocculant, the higher the molecular weight, the be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F2/10
Inventor 夏佐贵
Owner 四川银宇化工科技有限公司