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A hydrate kinetic inhibitor

A kinetic inhibitor, hydrate technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of unsuitable high supercooling degree, low cloud point, not widely used, etc., and reduce the cost of reagents , cost reduction, good inhibition effect

Active Publication Date: 2020-05-05
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although they can effectively inhibit the formation or growth of hydrates, they are not widely used because of: 1. Relatively low cloud point; 2. Not suitable for high subcooling environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation of hydroxyl-modified polyvinyl caprolactam (PVCap-OH) comprises the following steps:

[0029] (1) Weigh 118mg (0.72mmol) of azobisisobutyronitrile, 10g (72mmol) of N-vinylcaprolactam, 280mg (3.6mmol) of mercaptoethanol, and 150mL of isopropanol in a 250mL three-necked flask, and stir until dissolved. After sealing with a rubber stopper, vacuum-purge nitrogen for 3 times; react at 85°C for 24 hours in a nitrogen atmosphere, dry the reaction solution by rotary evaporation at 50°C, and cool to room temperature to obtain a crude product, which is dissolved in tetrahydrofuran , and then precipitated with n-hexane, the solid-to-liquid ratio of the crude product to THF is 1:3g / mL, the volume of n-hexane is 5 times the volume of THF, the resulting precipitate is washed with a large amount of anhydrous ether, filtered, and dried to obtain hydrate Kinetic inhibitor PVCap-OH.

[0030] The obtained hydrate kinetics inhibitor PVCap-OH was detected by C-NMR and H-spe...

Embodiment 2

[0036] The preparation of hydroxyl-modified polyvinyl caprolactam (PVCap-OH) comprises the following steps:

[0037] (1) Weigh 0.36mmol of azobisisobutyronitrile, 72mmol of N-vinylcaprolactam, 0.72mmol of mercaptoethanol, and 10mL of isopropanol in a 250mL three-neck flask, stir until dissolved, seal with a rubber stopper, and then vacuum-vent Nitrogen 3 times; react at 30°C for 40 hours in a nitrogen atmosphere, dry the reaction solution by rotary evaporation at 30°C, cool to room temperature to obtain a crude product, dissolve the obtained crude product in tetrahydrofuran, and then precipitate it with n-hexane, the crude product The solid-liquid ratio with THF is 1:1g / mL, the volume of n-hexane is twice the volume of THF, the obtained precipitate is washed with a large amount of anhydrous ether, filtered, and dried to obtain the hydrate kinetic inhibitor PVCap-OH.

Embodiment 3

[0039] The preparation of hydroxyl-modified polyvinyl caprolactam (PVCap-OH) comprises the following steps:

[0040] (1) Weigh 0.36mmol of azobisisobutyronitrile, 72mmol of N-vinylcaprolactam, 7.2mmol of mercaptoethanol, and 200mL of isopropanol in a 250mL three-necked flask, stir until dissolved, seal with a rubber stopper, and then vacuum-vent Nitrogen 3 times; react at 90°C for 6 hours in a nitrogen atmosphere, dry the reaction solution by rotary evaporation at 85°C, cool to room temperature to obtain a crude product, dissolve the obtained crude product in tetrahydrofuran, and then precipitate it with n-hexane, the crude product The solid-liquid ratio with THF is 1:5g / mL, and the volume of n-hexane is 10 times the volume of THF. The resulting precipitate is washed with a large amount of anhydrous ether, filtered, and dried to obtain the hydrate kinetic inhibitor PVCap-OH.

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Abstract

The invention provides a hydrate kinetic inhibitor. The hydrate kinetics inhibitor is formulated from vinylimidazole copolymer and auxiliary agent; the hydrate kinetics inhibitor is poly N-vinyl caprolactam modified by terminal hydroxyl, and its structure is shown in formula I , wherein n=10~1000. The hydrate kinetic inhibitor is a hydroxyl-modified amide type hydrate kinetic inhibitor, and is a new type of high-efficiency hydrate inhibitor with low dosage, high cloud point and ability to withstand a large degree of supercooling.

Description

Technical field: [0001] The invention relates to the field of hydrate technology, in particular to a hydrate kinetic inhibitor. Background technique: [0002] Natural gas hydrate is a non-stoichiometric clathrate complex with an ice-like appearance. The formation of gas hydrates in the process of natural gas transportation and processing will bring a series of hazards, such as blocking gas transmission pipelines, blocking blowout preventers and endangering deep-sea mining platform facilities, and even causing pipeline rupture in extreme cases, resulting in huge casualties and economic loss and environmental damage. Therefore, how to effectively prevent the formation of hydrates and avoid flow safety accidents caused by hydrate blockage is a very important and urgent issue for the entire oil and gas industry. [0003] At present, injecting additives into pipelines is a relatively effective and economical hydrate control method. These chemical additives are therefore also r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F126/06C08F8/34C09K8/524
CPCC09K8/524C08F226/06C09K2208/22C08F126/06C08F8/34C08F2810/40C08K5/315
Inventor 梁德青万丽
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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