Ionic liquid type hydrate inhibitor

A hydrate inhibitor, ionic liquid technology, applied in drilling composition, gas fuel, petroleum industry, etc., can solve the problem of immature development of kinetic inhibitor, poor solubility of kinetic inhibitor, inhibitor Problems such as unsatisfactory molecular structure, to achieve the effect of long inhibition time, reduced generation rate, and reduced contact opportunities

Inactive Publication Date: 2009-11-04
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the theoretically applicable undercooling degree for kinetic inhibitors can be lower than 10°C, the current development of kinetic inhibitors is far from mature (mainly reflected in the unsatisfacto

Method used

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  • Ionic liquid type hydrate inhibitor
  • Ionic liquid type hydrate inhibitor
  • Ionic liquid type hydrate inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] When the aqueous solution does not contain ionic liquid, the THF test is carried out, and the results are listed in Table 2.

Embodiment 2-4

[0048] Preparation of ionic liquid:

[0049] Synthesis of quaternary ammonium halide salts by tertiary amines and alkyl halides, such as 1-butyl-3-methylimidazolium chloride salt ([C 4 mim][Cl]) synthesis:

[0050] The reaction requires an organic solvent and excess haloalkane. After heating to reflux for several hours, use a rotary evaporator to remove the remaining haloalkane from the organic solvent after the reaction is complete. The response is as follows:

[0051] mim+EtCl=[C 4 mim][Cl]

[0052] Preparation concentrations were 0.005, 0.01 and 0.05wt% [C 4 mim] [Cl] ionic liquid aqueous solution, carry out THF test, the results are shown in Table 2.

Embodiment 5-7

[0054] 1-Ethyl-3-methylimidazolium bromide ([C 4 mim] [Br]) is similar to that in Example 2-4, only need to replace EtCl with EtBr to obtain ([C 4 mim][Br]). Preparation concentration is respectively 0.005,0.01 and 0.05wt% ([C 4 mim][Br]) ionic liquid aqueous solution, carry out THF test, the results are shown in Table 2.

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Abstract

The invention relates to an ionic liquid type hydrate inhibitor. The inhibitor is a dilute solution or a mixture prepared by dissolving one ionic liquid, two ionic liquids or more than two ionic liquids in a solvent; the ionic liquid is added to a solvent The mass concentration is 0.005~0.05wt%; the ionic liquid is composed of organic cations and organic or inorganic anions in a molar ratio of 1:1 combined by ionic bonds; the solvents are water, brine, alcohols and their mixtures, because the inhibitor has a unique The unit structure can form steric hindrance and electric barrier steric hindrance to the formation of clathrate hydrate in the fluid, which can inhibit the nucleation, growth and agglomeration of hydrate, has high inhibitory activity, and can reduce the viscosity of the fluid. Improve the fluidity of the fluid. Compared with the commonly used thermodynamic inhibitors, the inhibition performance and inhibition time are improved, the dosing dosage is greatly reduced, the dosing conditions are mild, the recovery is convenient, the solvent loss is small, and it is environmentally friendly.

Description

technical field [0001] The invention relates to an ionic liquid type hydrate inhibitor for inhibiting the generation of clathrate gas hydrate during the exploitation, processing and transportation of oil or natural gas. Background technique [0002] Natural gas hydrate is formed by certain small molecular gases (CO 2 、CH 4 、C 2 h 6 、C 3 h 8 、H 2 S, etc.) ice-like crystals formed with liquid water. In hydrates, water molecules connected by hydrogen bonds form a cage structure, and gas molecules are enclosed in the lattice under the action of van der Waals forces. [0003] The formation of natural gas hydrate is mainly related to the following three aspects: (1) natural gas contains liquid water or water vapor in a supersaturated state to form a cavity structure; (2) low temperature and high pressure conditions; (3) gas pressure fluctuations or flow direction Mutations produce disturbances or nuclei exist. The formation of hydrate mainly includes nucleation stage, slo...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K3/00C10L3/10
Inventor 胡玉峰于泳刘艳升曹睿李吉广杨伟曾鹏
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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