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Method for purifying natural gas

A purification method and natural gas technology, applied in separation methods, chemical instruments and methods, gas fuels, etc., can solve the problems of high energy consumption, large methane gas loss, environmental pollution, etc., achieve high separation efficiency, and increase the gas-liquid contact area , The effect of simple process

Active Publication Date: 2015-03-18
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

[0009] The purpose of the present invention is to provide a purification method of natural gas, which combines the absorption of impurity gas by normal temperature ionic liquid and the absorption of impurity gas by low temperature hydrate hydration reaction, which solves the problem of large loss of methane gas, high energy consumption and environmental impact in the traditional purification process. pollution problems

Method used

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  • Method for purifying natural gas

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Effect test

Embodiment 1

[0031] Take a gas sample, where CH 4 , CO 2 and H2 The molar ratios of S are 90.5%, 8.1% and 1.4%, respectively. After pressurization to 10MPa, it is passed into the ionic liquid absorption chamber. The ionic liquid is 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIm]PF 6 ), the temperature of the ionic liquid absorption chamber was controlled at 300K. After entering the hydrate reaction kettle, keep the pressure in the kettle at 2.5MPa and the temperature at 273K. After 24 hours of reaction, the analysis of gas chromatography shows that CH in the gas 4 The content is 96.5%, CO 2 The content is 2.9%, H 2 The S content is 0.6%.

Embodiment 2

[0033] Adopt the same gas sample as in Example 1 to pressurize to 4MPa and then pass into the ionic liquid absorption chamber, and the ionic liquid adopts 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMIm]PF 6 ), the temperature of the ionic liquid absorption chamber was controlled at 275K. After passing through the ionic liquid absorption chamber, the gas enters the hydrate reaction kettle through the gas booster pump, and the pressure inside the kettle is kept at 3.0MPa, and the temperature is 273K. After 24 hours of reaction, the gas chromatography analysis results show that CH in the gas 4 The content is 97.1%, CO 2 The content is 2.4%, H 2 The S content is 0.5%.

Embodiment 3

[0035] Change the ratio of the initial gas components, using CH 4 , CO 2 and H 2 Natural gas with S molar ratios of 85.5%, 10.1% and 4.4%, respectively, is pressurized to 3MPa and then passed into the ionic liquid absorption chamber. The ionic liquid is 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIm] BF4), the temperature of the ionic liquid absorption chamber was controlled at 280K. After passing through the ionic liquid absorption chamber, the gas enters the hydrate reactor through the gas booster pump, and the pressure of the hydrate reactor is kept at 3.5MPa and the temperature is 275K. After 24 hours of reaction, gas chromatography analysis results showed that CH in the gas 4 The content is 92.4%, CO 2 The content is 5.0%, H 2 The S content is 2.6%.

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Abstract

The invention discloses a method for purifying natural gas. The method for purifying natural gas comprises the steps of a. absorbing foreign gases by a normal-temperature plasma liquid; b. absorbing the foreign gases through hydration reaction of low-temperature hydrates, introducing the natural gas into a drying chamber for drying if the natural gas purified index is reached, and outputting; or circulating and purifying the natural gas after pipeline pressurization in an ion liquid absorption chamber until the purity achieves the requirements; and c. recovering and treating the ion liquid and water. According to the invention, the raw material natural gas is classified and purified, the technology is simple; the separation efficiency is high; the methane waste is less; and the disadvantages of the existing natural gas purifying technology are remedied effectively; and meanwhile, ion liquids and water can be recycled, the secondary pollution to the environment can be prevented effectively; and the method for purifying natural gas is wide in application range, and has favorable economic benefit and environment benefit.

Description

Technical field: [0001] The invention relates to a method for purifying natural gas, in particular to a method for purifying natural gas by combining the absorption of impurity gas by ionic liquid and the absorption of impurity gas by hydrate hydration reaction. Background technique: [0002] In recent years, global natural gas consumption has grown significantly, becoming one of the most important energy sources. The main components of natural gas are alkanes, of which methane accounts for the vast majority. In addition, there are generally hydrogen sulfide, carbon dioxide, nitrogen and water vapor, as well as a small amount of carbon monoxide and other impurity gases. The existence of these impurity gases has a great impact on the storage and transportation of natural gas. . Therefore, there are huge challenges in the utilization and treatment of natural gas. It is necessary to remove the acidic pollutant gases in the raw natural gas, mainly hydrogen sulfide and carbon di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/14C10L3/10
Inventor 臧小亚梁德青吴能友
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI