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Preparation method of ultra high molecular weight anionic polyacrylamide

A polyacrylamide, ultra-high molecular weight technology, applied in chemical instruments and methods, drilling compositions, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as inability to obtain molecular weight products, and achieve easy large-scale industrial production , The effect of stable polymerization and high initiation efficiency

Active Publication Date: 2012-10-17
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The second is to add alkali and other additives to the acrylamide aqueous solution, and then add a composite initiator composed of a redox initiator and an azo initiator at an initiation temperature of 5 to 30°C to initiate polymerization to obtain polyacrylamide. In this method, the polymerization is first initiated by a low-temperature redox initiator, and after the temperature of the polymerization system reaches the decomposition temperature of the azo initiator, the azo initiator continues to initiate the reaction polymerization, but this method cannot obtain products with a molecular weight of more than 30 million

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 25g of deionized water into the polymerization container, add 125g of 30% acrylamide, 10g of sodium carbonate, and 1.2g of urea in sequence under stirring, and pass in nitrogen to remove dissolved oxygen in the reaction system. At the same time, adjust the initiation temperature of the system to 15°C. After 15 minutes of passing nitrogen, add 0.0082 g of azobisisobutylamidine hydrochloride and 0.0225 g of sodium formate. After about 5 minutes, the polymerization system starts to become sticky and starts to heat up. After 2 hours, the temperature of the polymerization system reaches 50°C, and the temperature rises to 90°C. , hydrolyzed for 4 hours, then granulated, dried, and crushed to obtain polyacrylamide (HPAM) with a molecular weight of 33 million.

Embodiment 2，3

[0044] According to the method and steps of Example 1, the difference is that the initial temperature of the system in Example 2 is 5°C, and the molecular weight of the obtained HPAM is 35.42 million; the initial temperature of the system in Example 3 is 30°C, and the molecular weight of the obtained HPAM is 30.31 million. .

Embodiment 4

[0045] Example 4, 5, 6

[0046] According to the method and steps of Example 1, the difference is that the addition of azobisisobutylamidine hydrochloride in Example 4 is 0.004g, and the molecular weight of the resulting HPAM is 37.53 million; The added amount of salt was 0.007g, and the molecular weight of the obtained HPAM was 33.42 million; the added amount of azobisisobutylamidine hydrochloride in Example 6 was 0.01g, and the obtained molecular weight of HPAM was 31.22 million.

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Abstract

The invention relates to a preparation method of ultra high molecular weight anionic polyacrylamide, especially to a preparation method of acrylamide homopolymers. The invention belongs to a macromolecular compound obtained only by a carbon-carbon unsaturated bond reaction. The preparation method is characterized by comprising the following steps of: a, using the same kind of water-soluble azo initiator; b, pouring raw materials of an acrylamide monomer aqueous solution, a hydrolytic agent, an additional auxiliary agent and the initiator at a time; c, initiating at low temperature, performing adiabatic polymerization, hydrolyzing, granulating, drying and crushing; and d, preparing the ultra high molecular weight anionic polyacrylamide product with its molecular weight being greater than or equal to 30 million. The preparation method of the ultra high molecular weight anionic polyacrylamide has advantages of single initiator component, simple operation technology and high molecular weight of the product (greater than or equal to 30 million). The prepared product is suitable for polymer flooding of tertiary oil recovery in the oil field, flocculating agent for sewage treatment and papermaking, weaving, printing and dyeing industries.

Description

technical field [0001] The invention is a preparation method of ultra-high molecular weight anionic polyacrylamide. It is a polymer compound obtained by reacting only with carbon-carbon unsaturated bonds. In particular it relates to a process for the preparation of homopolymers of acrylamide. Background technique [0002] As a water-soluble polymer product, anionic polyacrylamide has been widely used in polymer flooding, sewage treatment, papermaking, textile, printing and dyeing industries in the oil recovery industry. In oil extraction, especially in the stage of tertiary oil recovery, high molecular weight anionic polyacrylamide is used to add the treated produced water, and then re-inject into the ground together to play the role of "oil displacement", which greatly improves oil recovery. output. Moreover, the higher the molecular weight of the polyacrylamide used, the better the "oil displacement" effect. At present, there is an urgent need for a large amount of pol...

Claims

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Application Information

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IPC IPC(8): C08F120/56C08F4/04C08F8/12C09K8/588C02F1/56
Inventor 郭卫东张勇梁斌
Owner CHINA PETROLEUM & CHEM CORP
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