Continuous posthydrolysis method for polyacrylamide

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, ...

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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 particles and the hydrolyzing agent, and poor mixing effect;

[0007] 4. The colloidal particles mixed with the hydrolysis agent are easy to form agglomerates in the hydrolysis tank, resulting in inconsistent residence time of the product in the hydrolysis tank, uneven distribution of hydrolysis degree, and poor thermal stability of the product

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