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Zwitterion-contained copolymer compounded natural gas hydrate inhibitor and preparation method thereof

A hydrate inhibitor, zwitterion technology, used in mechanical equipment, gas/liquid distribution and storage, piping systems, etc.

Inactive Publication Date: 2018-03-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared complex natural gas hydrate inhibitor containing zwitterionic copolymer is easy to operate, and the related content is rarely reported so far

Method used

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  • Zwitterion-contained copolymer compounded natural gas hydrate inhibitor and preparation method thereof
  • Zwitterion-contained copolymer compounded natural gas hydrate inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of zwitterionic copolymer P(VCap-co-VP-co-SBMA):

[0024] In a reaction flask equipped with magnetic stirring, vinylcaprolactam (1.2mmol), vinylpyrrolidone (0.6mmol), sulfobetaine methacrylate (0.2mmol), tetramethylethylenediamine (10μL) and Ammonium sulfate (10mg) was dissolved in a mixed solvent of DMSO and water with a volume ratio of 1:1, the reaction temperature was 20°C, and the reaction time was 30h. After the reaction was terminated, it was dialyzed with MWCO, and then freeze-dried to obtain a radical polymerized copolymer P(VCap-co-VP-co-SBMA) with a molecular weight of 10,000, and x / y=0.5.

[0025] (2) Preparation of compound natural gas hydrate inhibitor containing zwitterionic copolymer:

[0026] The copolymer P(VCap-co-VP-co-SBMA) with a molecular weight of 10000, which accounts for 0.1% of the system, is compounded with the thermodynamic inhibitor methanol at a mass ratio of 1:1 to obtain a compound type containing zwitterionic copolymers ...

Embodiment 2

[0029] (1) Preparation of zwitterionic copolymer P(VCap-co-VP-co-SBMA):

[0030] In a reaction flask equipped with magnetic stirring, vinylcaprolactam (2.4mmol), vinylpyrrolidone (1.2mmol), sulfobetaine methacrylate (0.4mmol), tetramethylethylenediamine (15μL) and Ammonium sulfate (15mg) was dissolved in a mixed solvent of DMSO and water with a volume ratio of 1:3, the reaction temperature was 30°C, and the reaction time was 40h. After the reaction stopped, it was dialyzed with MWCO, and then freeze-dried to obtain a free-radical copolymer P(VCap-co-VP-co-SBMA) with a molecular weight of 15,000, and x / y=1.8.

[0031] (2) Preparation of compound natural gas hydrate inhibitor containing POSS amphiphilic copolymer:

[0032] The copolymer P(VCap-co-VP-co-SBMA) with a molecular weight of 15000 accounting for 1% of the system is compounded with the thermodynamic inhibitor ethanol at a mass ratio of 1:10 to obtain a compound type containing zwitterionic copolymer Gas hydrate inhibi...

Embodiment 3

[0035] (1) Preparation of zwitterionic copolymer P(VCap-co-VP-co-SBMA):

[0036] In a reaction flask equipped with magnetic stirring, vinylcaprolactam (3.6mmol), vinylpyrrolidone (1.8mmol), sulfobetaine methacrylate (0.6mmol), tetramethylethylenediamine (20μL) and Ammonium sulfate (20mg) was dissolved in a mixed solvent of DMSO and water with a volume ratio of 1:5, the reaction temperature was 40°C, and the reaction time was 50h. After the reaction stopped, it was dialyzed with MWCO, and then freeze-dried to obtain a radical polymerized copolymer P(VCap-co-VP-co-SBMA) with a molecular weight of 30,000, and x / y=3.0.

[0037] (2) Preparation of compound natural gas hydrate inhibitor containing zwitterionic copolymer:

[0038] The copolymer P(VCap-co-VP-co-SBMA) with a molecular weight of 30000 accounting for 2% of the system was compounded with the thermodynamic inhibitor ethylene glycol at a mass ratio of 1:20 to obtain a compound containing zwitterionic copolymers. Formulate...

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Abstract

The invention discloses a zwitterion-contained copolymer compounded natural gas hydrate inhibitor. According to the compounded natural gas hydrate inhibitor, the monomers including vinyl-epsilon-caprolactam, vinyl pyrrolidone and methylacrylic acid sulfo-acid betaine are initiated to be copolymerized into a random copolymer by adopting a free radical polymerization method, and then the random copolymer and a thermodynamic inhibitor are compounded to inhibit nucleating and growth of a natural gas hydrate. The zwitterion-contained copolymer serves as a kinetic inhibitor and simultaneously showsthe performance of the thermodynamic inhibitor. The zwitterion-contained copolymer is used after being compounded with the alcohol thermodynamic inhibitor, and the using amount of alcohol can be decreased while growth of the hydrate is better inhibited. According to the compounded natural gas hydrate inhibitor, materials are easy to obtain, a method is simple and convenient, conditions are controllable, the prepared compounded natural gas hydrate inhibitor has the good effects that forming and growth of the natural gas hydrate are inhibited.

Description

technical field [0001] The invention relates to a copolymer containing a zwitterionic monomer as a natural gas hydrate inhibitor, compounded with a thermodynamic inhibitor, and applied in the field of natural gas transportation. Background technique [0002] Natural gas hydrate is easy to form in the environment of low temperature and high pressure, and forms blockage in the transportation pipeline, which may have adverse effects on human production and life. In order to delay or hinder the nucleation and growth of gas hydrate, people usually add a large amount of thermodynamic inhibitors (THIs) or a small amount of kinetic inhibitors (KHIs) to the transportation pipeline. [0003] Frequently used thermodynamic suppression such as methanol, ethylene glycol, and NaCl can reduce the subcooling required for hydrate formation and increase the pressure required for hydrate formation, thereby delaying the formation of natural gas hydrates. Methanol is used as the Thermodynamic in...

Claims

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Application Information

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IPC IPC(8): F17D1/16C08F226/06C08F220/38
CPCC08F226/06F17D1/16C08F220/387
Inventor 袁晓燕李川李晓晖朱孔营任丽霞赵蕴慧
Owner TIANJIN UNIV
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