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Synthesis method of hydrate inhibitor polyvinyl caprolactam and vinyl imidazole copolymer

A vinyl caprolactam, vinyl imidazole technology, applied in chemical instruments and methods, drilling compositions, spray evaporation and other directions, can solve problems such as high cost, inability to be popularized and applied, and achieve cost reduction and good inhibition effect. Effect

Active Publication Date: 2014-02-12
GANSU RES INSTION OF CHEM IND GRICI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The domestic research is to compound foreign inhibitors (such as Vcap) with other substances. The problem exists because it depends on foreign products, so the cost is very high, and it cannot be popularized and applied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A. Reaction: 9g of Vcap and 1g of EO are distilled off under reduced pressure to remove the polymerization inhibitor, then they are added to a three-necked flask with 0.5g of VA-044 and 100ml of dehydrated alcohol, nitrogen protection and start stirring, rise to 65°C, stop the reaction after 7 hours of reaction;

[0026] B. Post-processing: The reaction solution is directly passed through a spray dryer to obtain a white solid powder.

[0027] Performance test: Prepare 300ml of the obtained product with 2% concentration solution with water, pour it into the autoclave connected with various equipments, seal the autoclave, tighten the screws, vacuumize, and close the valve when the vacuum reaches the maximum . Stirring is started at 200 rpm, the temperature of the cryostat is lowered to 1 degree, the temperature in the kettle is reduced to about 5-7 degrees, the temperature is kept constant for 10 minutes, the pressure of natural gas is introduced to 9Mpa, and the gas val...

Embodiment 2

[0029] A. Reaction: 8g of Vcap and 2g of EO are distilled off under reduced pressure to remove the polymerization inhibitor, then they are added to a three-necked flask with 0.5g of VA-044 and 100ml of dehydrated alcohol, nitrogen protection and start stirring, rise to 80°C, stop the reaction after 7 hours of reaction;

[0030] B. Post-processing: The reaction solution is directly passed through a spray dryer to obtain a white solid powder.

[0031] Performance testing: the operation is the same as the performance testing steps in Example 1, the test is stopped, and the recording time is 1740min.

Embodiment 3

[0033] A, reaction: 7g of Vcap and 3g of EO are distilled off under reduced pressure to remove the polymerization inhibitor, then they are added in a three-necked flask with 0.5g of VA-044 and 100ml of dehydrated alcohol, nitrogen protection and start stirring, rise to 72°C, stop the reaction after 7 hours of reaction;

[0034] B. Post-processing: The reaction solution is directly passed through a spray dryer to obtain a white solid powder.

[0035] Performance testing: the operation is the same as the performance testing steps of embodiment 1, the test is stopped, and the recording time is 1800min.

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PUM

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Abstract

The invention discloses a method for commercial synthesis of hydrate inhibitor polyvinyl caprolactam, which includes the following steps of: A, reaction: distilling vinylcaprolactam and vinylimidazole under reduced pressure to remove the polymerization inhibitor, then putting the mixture into a 3-neck flash together with azo bibutyl imidazoline hydrochloride and absolute ethyl alcohol, introducing nitrogen for protection, stirring until the temperature rises to 65-80 DEG C, making the materials react for 7 hours and then stopping the reaction; and B post-processing: making the reaction solution directly pass through a spray dryer to obtain white solid powder. In a variety of patents of polymer synthesis methods, no spray dryer is mentioned, and compared with other post processing methods, the method of adopting the spray dryer for drying has the advantages that the operation is simplified and a basis for industrial production is achieved. Meanwhile, the inhibition of the hydrate inhibitor polyvinyl caprolactam obtained through the method barely changes, and the hydrate inhibitor polyvinyl caprolactam has good inhibition effect.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrates, in particular to a method for synthesizing kinetic inhibitor polyvinylcaprolactam. Background technique [0002] Natural gas hydrate is an ice-like white solid substance formed by natural gas and water at low temperature and high pressure. Because most of the natural gas components are methane, it is also called methane hydrate. The formation of hydrates in the medium is very harmful to oil and gas production, storage and transportation. There are three crystal structures of natural gas hydrates that have been discovered so far, which are customarily called type I, type II and type H. The water molecules that form hydrates are called hosts, and the other components that form hydrates are called guests. The host water molecules are connected by hydrogen bonds to form some polyhedral cage holes, and the guest molecules of appropriate size can be filled in these cages to make them ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F226/06C08J3/12C09K8/524F17D1/02F17D1/08B01D1/18
Inventor 韩庆荣张鹏云刘茵赵坤王琴巨雪霞
Owner GANSU RES INSTION OF CHEM IND GRICI