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Preparation method of hydrate inhibitor modified on basis of polyvinyl pyrrolidone

A technology of polyvinylpyrrolidone and hydrate inhibitor, which is applied in the directions of drilling compositions, chemical instruments and methods, mechanical equipment, etc., can solve problems such as insoluble and ineffective, and achieves simple synthesis method, inhibiting Good effect, high purity effect

Inactive Publication Date: 2018-03-23
SHAANXI HUANKE BIOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Polyvinylpyrrolidone (PVP) is currently a commonly used hydrate kinetic inhibitor, but it has defects such as insoluble and high supercooling failure during use, and due to the addition of Special groups have a greater impact on the properties of the polymer, therefore, it can be modified by adding some hydrophilic groups at the end of the PVP molecular chain

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method based on the polyvinylpyrrolidone modified hydrate inhibitor comprises the following steps:

[0022] (1) Add the chain initiator azobisisobutyronitrile into a three-necked flask equipped with a thermometer, a condenser tube and a N2 conduit, seal it, vacuumize it, and then pass in nitrogen;

[0023] (2) Inject 1-vinyl-2-pyrrolidone, chain transfer agent, and N,N'-diformamide into the system in step (1) in sequence, then vacuumize and pass nitrogen gas; wherein, the The chain transfer agent is 1-butylamine or glacial acetic acid; the chain initiator azobisisobutyronitrile, 1-vinyl-2-pyrrolidone, chain transfer agent, N,N'-diformamide The addition ratio is 180mg:11mL:280μL:50mL;

[0024] (3) Under a nitrogen atmosphere, the product of step (2) was reacted at 70°C for 6 hours, and naturally cooled to room temperature;

[0025] (4) Evaporate the product of step (3) at 95°C for 30 minutes. After cooling, add 4 times the volume of N,N'-dimethylformami...

Embodiment 2

[0027] The preparation method based on the polyvinylpyrrolidone modified hydrate inhibitor comprises the following steps:

[0028] (1) Add the chain initiator azobisisobutyronitrile into a three-necked flask equipped with a thermometer, a condenser tube and a N2 conduit, seal it, vacuumize it, and then pass in nitrogen;

[0029] (2) Inject 1-vinyl-2-pyrrolidone, chain transfer agent, and N,N'-diformamide into the system in step (1) in sequence, then vacuumize and pass nitrogen gas; wherein, the The chain transfer agent is 1-butylamine or glacial acetic acid; the chain initiator azobisisobutyronitrile, 1-vinyl-2-pyrrolidone, chain transfer agent, N,N'-diformamide The addition ratio is 180mg:11mL:280μL:50mL;

[0030] (3) Under a nitrogen atmosphere, the product of step (2) was reacted at 90°C for 10 hours, and naturally cooled to room temperature;

[0031] (4) Evaporate the product of step (3) at 105°C for 60 minutes. After cooling, add ethyl acetate dropwise with 4 times the ...

Embodiment 3

[0033] The preparation method based on the polyvinylpyrrolidone modified hydrate inhibitor comprises the following steps:

[0034] (1) Add the chain initiator azobisisobutyronitrile into a three-necked flask equipped with a thermometer, a condenser tube and a N2 conduit, seal it, vacuumize it, and then pass in nitrogen;

[0035] (2) Inject 1-vinyl-2-pyrrolidone, chain transfer agent, and N,N'-diformamide into the system in step (1) in sequence, then vacuumize and pass nitrogen gas; wherein, the The chain transfer agent is 1-butylamine or glacial acetic acid; the chain initiator azobisisobutyronitrile, 1-vinyl-2-pyrrolidone, chain transfer agent, N,N'-diformamide The addition ratio is 180mg:11mL:280μL:50mL;

[0036] (3) Under a nitrogen atmosphere, the product of step (2) was reacted at 80°C for 8 hours, and naturally cooled to room temperature;

[0037] (4) Rotate the product of step (3) at 100°C for 450 minutes. After cooling, add ethyl acetate dropwise with 4 times the vol...

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Abstract

The invention discloses a preparation method of a hydrate inhibitor modified on basis of polyvinyl pyrrolidone. The method comprises steps as follows: (1) a chain inhibitor azodiisobutyronitrile is added to a three-neck bottle provided with a thermometer, a condensing pipe and a N2 guide pipe, the three-neck bottle is vacuumized after being sealed, and nitrogen is introduced; (2) 1-vinyl-2-pyrrolidone, a chain transfer agent and N,N'-diformamide are injected sequentially to system in the step (1), vacuumization is performed, and nitrogen is introduced; (3) a product obtained in the step (2) issubjected to a reaction in the nitrogen atmosphere at the temperature of 70-90 DEG C for 6-10 h and then cooled naturally to the room temperature; (4) the product obtained in the step (3) is subjected to rotary evaporation and cooled, ethyl acetate with the volume being 4 times that of N,N'-diformamide is dropwise added, precipitates are produced, and the precipitates are subjected to vacuum drying after being filtered and then baked to be dried. The synthesized hydrate inhibitor has high purity which can reach 99.9%, has a good inhibition effect and is synthesized with a simple synthesis method.

Description

technical field [0001] The invention belongs to the technical field of hydrate inhibitors, and in particular relates to a preparation method of a polyvinylpyrrolidone-based modified hydrate inhibitor. Background technique [0002] Natural gas hydrate is a non-stoichiometric gas hydrate formed by the interaction of some low-boiling hydrocarbon gases (such as methane, ethane, propane, hydrogen, carbon dioxide, nitrogen, hydrogen sulfide, etc.) with water molecules under high pressure and low temperature conditions. clathrate complexes. In some oil and gas pipelines and deep sea operations, due to the high pressure and low temperature conditions, hydrates are easy to form, which will cause safety accidents such as pipeline blockage and oil and gas extraction equipment failure. [0003] Hydrate formation can be effectively prevented by adding hydrate inhibitors, which include thermodynamic inhibitors and kinetic inhibitors. [0004] Thermodynamic inhibitors usually have proble...

Claims

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Application Information

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IPC IPC(8): C08F126/10C09K8/524C09K8/528F17D1/02F17D1/08
CPCC08F126/10C09K8/524C09K8/528C09K2208/22F17D1/02F17D1/08
Inventor 郝青
Owner SHAANXI HUANKE BIOLOGICAL TECH CO LTD
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