Synthesis method of hydrate inhibitor polyvinyl caprolactam

A technology of vinyl caprolactam and hydrate inhibitor, which is applied in the field of synthesis of kinetic inhibitor polyvinyl caprolactam, can solve the problems of inability to popularize and apply, high cost, slow promotion and application, etc., and achieve good inhibitory effect and lower price Effect

Active Publication Date: 2012-09-26
GANSU RES INSTION OF CHEM IND GRICI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Since the various inhibitors mentioned above belong to large foreign companies, and the products need to be imported, the cost is relatively high, resulting in slow promotion and application in my country.
[0008]

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 under reduced pressure to remove the polymerization inhibitor, and then they are added to a three-necked flask with 0.5g of VA-044 and 100ml of absolute ethanol, protected by nitrogen, and stirred to 65℃, stop the reaction after 7h;

[0026] B. Post-treatment: Pass the reaction liquid directly through a spray dryer to obtain a white solid powder.

[0027] Performance test: The obtained product is made into 300ml of 2% concentration solution with water, poured into the autoclave connected to various equipment, the autoclave is sealed, the screw is tightened, and the vacuum is drawn. When the vacuum reaches the maximum, close the valve . Turn on the stirring at 200 revolutions per minute, the cryostat cools down to 1 degree, the inside of the kettle drops to about 5-7 degrees, and the temperature is kept constant for 10 minutes. The natural gas pressure is started to be 9Mpa, and the gas valve is closed. Start to record the ...

Embodiment 2

[0029] A. Reaction: 8g of Vcap and 2g of EO were distilled under reduced pressure to remove the polymerization inhibitor, and then they were added to a three-necked flask with 0.5g of VA-044 and 100ml of absolute ethanol. 80℃, stop the reaction after 7h;

[0030] B. Post-treatment: Pass the reaction liquid directly through a spray dryer to obtain a white solid powder.

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

Embodiment 3

[0033] A. Reaction: 7g of Vcap and 3g of EO were distilled under reduced pressure to remove the polymerization inhibitor, and then they were added to a three-necked flask with 0.5g of VA-044 and 100ml of absolute ethanol. 72℃, stop the reaction after 7h;

[0034] B. Post-treatment: Pass the reaction liquid directly through a spray dryer to obtain a white solid powder.

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

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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 polyvinyl caprolactam. 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 its natural gas component is mostly methane, it is also called methane hydrate. Natural gas can be porous in pipelines, well bores and formations. The formation of hydrates in the medium is very harmful to oil and gas production, storage and transportation. At present, there are three types of natural gas hydrate crystal structures that have been discovered, which are customarily called type I, type II and type H structures. 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 cages. Guest molecule...

Claims

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Application Information

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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
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