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Preparation method of N-polyvinylcaprolactam solution taken as kinetic hydrate inhibitor

A technology for vinyl caprolactam and hydrate inhibitor, which is applied in the field of preparation of poly-N-vinyl caprolactam solution, can solve the problems of increased production cost, increased solvent consumption, complicated process, etc., and achieves improved production efficiency and improved compounding performance, the effect of reducing environmental pollution

Inactive Publication Date: 2016-03-30
GANSU RES INSTION OF CHEM IND GRICI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large concentration at the end of the synthetic polymer reaction of this method, the viscosity of the reaction system increases, and post-treatment operations such as dissolution, precipitation, and purification are required, which makes the process more complicated and the amount of solvent increases, which not only increases the production cost, but also causes environmental pollution. Severe pollution, limiting the application of PNVCL

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 300g of N-vinylcaprolactam, measure 500ml of methanol, add it to a 1000ml three-necked flask, pass through nitrogen protection, stir and heat to dissolve, dissolve 0.6g of azobisisopropylimidazoline hydrochloride into 100ml of methanol, Add it dropwise into a three-necked flask, raise the temperature to 65°C, and stir for 6 hours; cool down to 30°C, add 400ml of methanol, and stir for about 0.5h to obtain a methanol solution of poly-N-vinylcaprolactam.

[0016] The high-pressure test shows that the polymer solution has a good inhibitory effect on natural gas hydrate, and the inhibitory time is about 18.8 hours.

Embodiment 2

[0018] Weigh 300g of N-vinylcaprolactam, measure 500ml of methanol, add it to a 2000ml three-necked flask, pass through nitrogen protection, stir and heat to dissolve, dissolve 0.6g of azobisisopropylimidazoline hydrochloride into 100ml of methanol, Add it dropwise into a three-necked flask, raise the temperature to 65°C, and stir for 6 hours; cool down to 30°C, add 600ml of methanol, and stir for about 0.5h to obtain a methanol solution of poly-N-vinylcaprolactam.

[0019] The high-pressure test shows that the polymer solution has a good inhibitory effect on natural gas hydrate, and the inhibitory time is about 18.5 hours.

Embodiment 3

[0021] Weigh 300g of N-vinylcaprolactam, measure 500ml of methanol, add it to a 2000ml three-necked flask, pass through nitrogen protection, stir and heat to dissolve, dissolve 0.6g of azobisisopropylimidazoline hydrochloride into 100ml of methanol, Add it dropwise into a three-necked flask, raise the temperature to 65°C, and stir for 6 hours; cool down to 30°C, add 800ml of methanol, and stir for about 0.5h to obtain a methanol solution of poly-N-vinylcaprolactam.

[0022] The high-pressure test shows that the polymer solution has a good inhibitory effect on natural gas hydrate, and the inhibitory time is about 18.3 hours.

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Abstract

The invention provides a preparation method of an N-polyvinylcaprolactam solution taken as a kinetic hydrate inhibitor. According to the invention, N-vinylcaprolactam is taken as a monomer, azo diisopropyl imidazoline hydrochloride is taken as an initiating agent, polyvinylcaprolactam is obtained via solution polymerization, methyl alcohol or ethanediol is taken as a solvent, and reaction is carried out for 2 to 12h at 55 to 85 DEG C with stirring; an obtained product is cooled to 30 to 45 DEG C, the solvent is added for uniform stirring so as to obtain the N-polyvinylcaprolactam solution. The finished product is a solution, so that post-treatment operation such as dissolving, precipitating, and purifying are avoided, post-treatment technology is simplified, production period is shortened, production efficiency is increased, and production cost is reduced; and at the same time application of toxic solvent is avoided, and environment pollution is reduced. Inhibition performance of hydrates is not influenced by the N-polyvinylcaprolactam solution, N-polyvinylcaprolactam compounding performance is improved, a plurality of solution forms can be prepared based on market requirements, and industrial application prospect is promising.

Description

technical field [0001] The invention belongs to the field of organic synthesis chemistry, and relates to a preparation method of a poly-N-vinyl caprolactam solution used as a kinetic hydrate inhibitor. Background technique [0002] Gas hydrates form crystals with a cage-like structure similar to dry ice, often causing blockages in pipes, valves and equipment. The traditional method of inhibiting hydrate is to use thermodynamic method, that is, inject methanol, ethylene glycol and other alcohols or add electrolytes to change the thermodynamic equilibrium conditions of hydrate to control the formation of hydrate. However, the large amount of inhibitor used, high cost, high toxicity and difficult to recycle will cause serious environmental pollution. [0003] Poly-N-vinylcaprolactam (PNVCL) is a temperature-sensitive (thermo-sensitive) polymer with a low critical solution temperature (LCST), which has the advantages of good biocompatibility and low biotoxicity. It has been wi...

Claims

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Application Information

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IPC IPC(8): C08F126/06C08F2/06
CPCC08F126/06C08F2/06
Inventor 耿来红徐世栋潘炳庆刘茵
Owner GANSU RES INSTION OF CHEM IND GRICI
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