Method for purifying natural gas

A technology for purification and treatment of natural gas, applied in the field of natural gas, which can solve problems such as environmental pollution, high production and use costs, and weak corrosion, and achieve the effects of reducing production costs and improving desulfurization and purification efficiency

Active Publication Date: 2013-08-28
东莞新盈能源利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, there were many methods of using monoethanolamine and diethanolamine. Due to the fast reaction speed, strong alkalinity and remarkable desulfurization ability of this method, it was used more for a period of time; but due to the selectivity of this solvent Not much, and because it is easy to absorb heat and degrade, it will cause corrosion to the equipment. Therefore, in order to improve the shortcomings, methyldiethanolamine or diisopropanolamine with better performance has been used as a desulfurizer in industry. Diethanolamine is an example. Its energy-saving effect is very ideal, coupled with the advantages of weak corrosion, high concentration and high selectivity, it has developed rapidly at home and abroad.
At present, the application of alcohol amine method in desulfurization technology has changed from a single aqueous solution to a diversified solvent compound, so as to improve operability and application range, reduce production costs, and achieve energy-saving goals. One of the disadvantages of this method is that A large amount of lye wastewater has caused environmental pollution
[0008] Dry desulfurization means that the raw material gas passes through a fixed bed equipped with a solid desulfurizer at a certain space velocity, and through gas-solid contact exchange, hydrogen sulfide in the gas phase is adsorbed on the desulfurizer, so as to achieve the purpose of purification. Solid desulfurizers mainly include zinc oxide, activated carbon, iron oxide, etc., and their production and use costs are relatively high

Method used

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  • Method for purifying natural gas

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Experimental program
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Effect test

Embodiment 1

[0046] The preparation of embodiment 1 desulfurizer

[0047] The natural graphite was treated twice with 5% HCl, filtered, then thoroughly washed with distilled water, dried at 110°C for 24 hours, and 10 g of the treated graphite was placed in 230 mL of concentrated H 2 SO 4 In, slowly add 30gKMn0 in ice-water bath 4 , Stir continuously so that the temperature of the solution does not exceed 20°C. At this time, the mixed solution was mechanically stirred at 35±3°C for 40 minutes, and then 460 mL of distilled water was slowly added to the mixed solution, and the temperature rose rapidly to 98°C. Keep the mixed solution at 35±3°C and continue stirring for 20min. After the reaction is completed, mix 1.4L distilled water and 100mLH 2 0 2 Add to solution. Stand still for 24 hours, and finally wash and filter with 5% HCl until no S0 can be detected in the filtrate 4 2- until. Finally, the filtered product was vacuum-dried at 50°C in a vacuum drying oven for use; the prepared...

Embodiment 2

[0048] The preparation of embodiment 2 ionic liquid

[0049] Dissolve 1g of 1-vinylimidazole in 10ml of ethyl acetate solvent, put it in a 250ml three-neck flask, then add 1ml of bromoethane dropwise, after the dropwise addition, heat to 60°C to keep the temperature constant, and carry out stirring reaction for 12h. After the reaction is finished, the reaction system is suction-filtered, and the filtered cake is washed with ethyl acetate to obtain a light yellow solid intermediate, which is vacuum-dried to constant weight. Take 1g of the vacuum-dried solid intermediate and add 20ml of deionized water , put in a three-necked flask, take 2g of sodium tetrafluoroborate and add it into the three-necked flask, stir magnetically, heat to 60°C to keep the temperature constant, react for 24h, spin evaporate to remove water after the reaction, add acetone to the remaining liquid until Inorganic salt NaBr was precipitated, NaBr was removed by suction filtration, and finally acetone was ...

Embodiment 3

[0050] The preparation of embodiment 3 carbon dioxide absorbent

[0051] 120g ionic liquid 1-ethyl-3-vinylimidazole tetrafluoroborate, 200gN-methyldiethanolamine (MDEA), 410g monoethanolamine (MEA) and 270g deionized water prepared in Example 2 were prepared at normal temperature and pressure Mix and stir evenly in proportion to obtain a carbon dioxide absorber.

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Abstract

The invention provides a method for purifying natural gas. The method comprises the following steps of firstly, desulfuration of the natural gas; secondly, carbon dioxide removal from the desulfurated natural gas; and thirdly, dehydration of the natural gas with carbon dioxide removed so as to obtain the purified natural gas. According to the method, the production cost can be remarkably reduced, the desulfurization and purification efficiency can be improved, and no contamination is caused to the environment.

Description

technical field [0001] The invention relates to the technical field of natural gas, in particular to a method for purifying natural gas. Background technique [0002] As the cleanest fossil energy recognized in the world, natural gas is playing an increasingly important role in the energy consumption structure of various countries. According to the 2011 data of the world BP energy statistics, natural gas accounted for 27.17% of the total energy consumption in the United States in 2010, while my country only accounted for 4.03%. Driven by my country's sustained and stable economic growth, energy conservation, emission reduction, and low-carbon environmental protection, the development of the natural gas industry will enter an unprecedented continuous peak period. [0003] For a long time, my country has been plagued by various soot pollution, and more than 60% of the cities are in the second level or lower air pollution level. Therefore, how to focus on the change of energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 薛文龙
Owner 东莞新盈能源利用有限公司
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