Continuous posthydrolysis method for polyacrylamide

A technology of polyacrylamide and acrylamide, which is applied in the field of hydrolysis after continuous polyacrylamide, which can solve the problems of short mixing time of colloidal particles and hydrolyzing agent, uneven distribution of hydrolysis degree, unfavorable dispersion of hydrolyzing agent, etc., and increase the molecular weight of the product and solubility, which is beneficial to production control and improves the effect of temperature resistance and salt resistance

Active Publication Date: 2015-01-07
DONGYING BAOMO ENVIRONMENT ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 2. After the granules are granulated, they are easy to stick together, which is not conducive to the dispersion of the hydrolyzing agent in the granules;
[0006] 3. After mixing the colloidal particles and the hydrolyzing agent for a period of time, the sticky phenomenon reappears, resulting in a short mixing time of the colloidal pa

Method used

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  • Continuous posthydrolysis method for polyacrylamide

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Embodiment 1

[0025] The weight of fresh rubber blocks with a water content of 80% is 900Kg. The rubber blocks are granulated through a granulation equipment, with a particle size of 5-9mm. The polyacrylamide rubber particles are 0.3- Add 9Kg dispersant polyglycerol ester at a uniform speed at 0.4m to disperse the colloidal particles without agglomeration. Add 35.1Kg NaOH (35% degree of hydrolysis) to the 0.7-0.8m of the thread for post-hydrolysis. The NaOH added per unit time The weight ratio of the outflow weight of polyacrylamide colloidal particles per unit time should be 1.5%-5%, and 9Kg dispersant Span 60 is added at 1.1-1.2m during the screw conveying process, so that the polyacrylamide colloidal particles and NaOH Mix well; after all the polyacrylamide colloidal particles are moved to the intermediate silo and sealed for 4 hours, the hydrolysis reaction of the polyacrylamide colloidal particles can be completed. The fully hydrolyzed colloidal particles are secondary granulated, drie...

Embodiment 2

[0029] The weight of fresh rubber blocks with a moisture content of 70% is 800Kg. The rubber blocks are granulated through a granulation equipment with a particle size of 5-9mm. The polyacrylamide rubber particles are 300- Add 8Kg of dispersant fatty alcohol ethylene oxide condensate at a constant speed at 400cm to disperse the colloidal particles without sticking and agglomerating. Add 62.5KgNaHCO at 700-800cm of the thread 3 (22% degree of hydrolysis) after carrying out hydrolysis, the NaHCO added per unit time 3 The weight ratio of the outflow weight of polyacrylamide colloidal particles per unit time should be 1.5%-5%. Add 9Kg dispersant sorbitan fatty acid ester at 1100-1200cm during the screw conveying process to make the polyacrylamide gel Granules can be mixed with NaHCO 3 Mix well; after all the polyacrylamide colloidal particles are moved to the intermediate silo and sealed for 4 hours, the hydrolysis reaction of the polyacrylamide colloidal particles can be complet...

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Abstract

The invention relates to a continuous posthydrolysis method for polyacrylamide. The continuous posthydrolysis method comprises the following steps: homopolymerizing aqueous solution of the acrylamide to obtain high molecular weight polyacrylamide gel blocks; after one-time granulation, adding a dispersing agent I accounting for 1-1.5 percent of the total weight of the gel blocks during passing through a double-ribbon hydrolyzer and uniformly mixing; then adding alkaline as a hydrolytic agent and uniformly mixing the alkaline and colloidal particles; after uniformly mixing, adding a dispersing agent II accounting for 0.8-1.2 percent of the total weight of the gel blocks and uniformly dispersing; finally, enabling the mixture to enter a hydrolysis tank for hydrolysis; besides, keeping the hydrolysis tank at a certain material level for avoiding the influence on continuous operation of the granulation on the next station. With the addition of the dispersing agent I, the colloidal particles are prevented from being easily bonded and aggregated; the dispersion is uniform, so that the resistance for uniform mixing of the colloid and the hydrolytic agent is reduced, and the uniform mixing time of the colloid and the hydrolytic agent is shortened; with the addition of the dispersing agent II, the colloid and the hydrolytic agent can be mixed more sufficiently, and a hydrolysis reaction is realized more thoroughly. The amount of residual monomers and the content of water insoluble matters are effectively reduced, the molecular weight and the solubility of products are improved, and the viscosity of the products is improved.

Description

technical field [0001] The invention belongs to the technical field of post-hydrolysis of polyacrylamide, and in particular relates to a post-hydrolysis method of continuous polyacrylamide. Background technique [0002] Polyacrylamide (PAM) is a water-soluble polymer active agent with good performance. In recent years, PAM has been widely used in petroleum, chemical industry, metallurgy, papermaking, textile, water treatment and other industrial sectors. The demand is increasing year by year. It is the most widely used water-soluble polymer product. It is currently developing towards specialization and functionalization. Its oil field oil displacement agent products mainly pursue the improvement of properties such as high molecular weight, good solubility, temperature resistance, and salt resistance. [0003] The hydrolysis process of polyacrylamide is usually divided into two types: homopolymerization cohydrolysis and homopolymerization post hydrolysis. One more process, ...

Claims

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Application Information

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IPC IPC(8): C08F120/56C08F8/12
Inventor 刘皓陈霞周卫东李岳军王义民王曰鹏
Owner DONGYING BAOMO ENVIRONMENT ENG CO LTD
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