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Method for preparing CH4 hydrate inhibitor and application thereof

A hydrate and kinetic inhibitor technology, which is applied in the fields of natural gas transportation and chemical industry, can solve the problems of short inhibition time and low dosage, and achieve the effects of convenient implementation, low cost and reduced nucleation

Inactive Publication Date: 2016-06-15
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a terpolymer hydrate inhibitor, which solves the problem of short inhibition time of the existing inhibitors in the case of a large degree of subcooling, and has a small dosage, and is suitable for the soda-water two-phase system

Method used

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  • Method for preparing CH4 hydrate inhibitor and application thereof
  • Method for preparing CH4 hydrate inhibitor and application thereof
  • Method for preparing CH4 hydrate inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Under nitrogen protection, 8 g of N-vinylpyrrolidone, 4 g of maleic anhydride and 4 g of acrylamide were dissolved in 40 g of absolute ethanol. Add 0.4 g of azobisisobutyronitrile as an initiator at 60° C. and stir evenly for 30 minutes. Stirring was continued and the temperature was raised to 80° C. for 8 hours. Cool down to room temperature after the reaction, dry the reaction product in an oven at 45°C to constant weight, dissolve the crude product in tetrahydrofuran, wash it with n-hexane, and finally dry it in a vacuum oven at 45°C to obtain the product. Molecular weight Mn=12000, relative molecular mass distribution coefficient 2.51.

Embodiment 2

[0026] Under nitrogen protection, 8 g of N-vinylpyrrolidone, 6 g of maleic anhydride and 6 g of acrylamide were dissolved in 30 g of absolute ethanol. Add 0.8 g of azobisisobutyronitrile at 60° C. and stir evenly for 30 minutes. Stirring was continued and the temperature was raised to 90° C. for 8 hours. Cool down to room temperature after the reaction, dry the reaction product in an oven at 45°C to constant weight, dissolve the crude product in tetrahydrofuran, wash it with n-hexane, and finally dry it in a vacuum oven at 45°C to obtain the product. Molecular weight Mn=20000, relative molecular mass distribution coefficient 2.6.

Embodiment 3

[0028] Prepare 1000 g of a solution containing terpolymer P (NVP / MAH / AM) with a mass concentration of 0.11%, rinse the autoclave with distilled water, inject 170 g of the solution into the autoclave, control the temperature in the autoclave to 2.5°C, and feed CH 4 Gas, when the pressure in the kettle is 7MPa, stop the air intake, turn on the stirring, and the stirring speed is 500r / min. After the experiment, it can be seen from the curve of pressure P versus time during the experiment that at the beginning due to CH 4 The gas dissolves in water, and the pressure drops slightly. When the time is 150 minutes, the curve of pressure P versus time shows an inflection point, which proves that a large amount of hydrates begin to form. At this time CH 4 The induction time of hydrate formation under the above conditions is 150min.

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Abstract

The invention relates to a method for preparing a dynamic inhibitor for preventing generation of a CH4 hydrate and an application thereof. The dynamic inhibitor is a copolymer P (NVP / MAH / AM) generated by reacting N-vinyl pyrrolidone, maleic anhydride and acrylamide, the inhibitor has a space structure which can form steric hindrance through adsorptive action for inhibiting nucleation, growth and agglomeration of the CH4 hydrate, can effectively prevent that CH4 gas generate the hydrate under low temperature and high pressure conditions, can be individually used, and also can be used with alcohols through complex formulation. Compared with the traditional inhibitors, the CH4 hydrate inhibitor has the advantages of low amount, obvious inhibition effect, and environmental protection.

Description

technical field [0001] The invention belongs to the technical fields of chemical engineering and natural gas transportation, and in particular relates to a preparation method and application of a terpolymer of N-vinylpyrrolidone, maleic anhydride and acrylamide. Background technique [0002] Gas hydrate is a non-stoichiometric cage compound similar to ice formed by small molecular gas and water under low temperature and high pressure. In gas hydrates, water molecules are bound by strong hydrogen bonds to form a lattice structure, and gas molecules fill the cages between lattices by using the van der Waals force between them and water molecules, while there is no stoichiometric relationship between gas and water relation. In the process of natural gas exploitation and transportation, due to the low temperature and high pressure conditions in the pipeline, natural gas hydrate is easy to form, causing blockage of pipeline equipment, and even separation of equipment and instrum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F226/10C08F222/06C09K8/524
CPCC08F220/56C08F226/10C09K8/524C09K8/882C09K2208/22C08F222/06
Inventor 李工丁嘉
Owner CHANGZHOU UNIV
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