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Amido-containing ionic liquid used for absorbing acidic gases and preparation method and application thereof

An acid gas and ionic liquid technology, which is applied in the preparation of amino-substituted hydrogen atoms, separation methods, and carboxylate preparation, etc., can solve the problems of absorbent loss, secondary pollution of purified gas, environmental pollution, etc., and achieves low cost of raw materials, Restoring absorption capacity, a wide range of effects

Active Publication Date: 2011-03-30
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The object of the present invention is to provide a kind of cheap amine-containing ionic liquid, absorb CO with it 2 、H 2 S, SO 2 Solve the problems of secondary pollution of purified gas, environmental pollution and loss of absorbent caused by volatilization of traditional organic alkanolamine absorbents, and greatly improve the absorption capacity of acidic gases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The synthesis device of the ionic liquid is a three-necked flask equipped with a stirring blade, a dropping funnel and a condensing reflux tube. Place the three-neck flask in an ice-water bath. A certain amount of triethylenetetramine (TETA) was weighed, diluted with water to a concentration of 60m%, added into a three-necked flask and stirred. Weigh equimolar tetrafluoroboric acid (HBF 4 ), diluted with water to a concentration of 60m%, added to the dropping funnel, slowly dripped into the three-necked flask. After the dropwise addition was completed, stirring was continued for 3 h in an ice-water bath. The reacted liquid was evaporated to remove most of the water, and then dried in a vacuum oven at 60°C for 24 hours to obtain [TETAH] + [BF 4 ] - ionic liquid.

Embodiment 2

[0040] The synthesis device of the ionic liquid is a three-necked flask equipped with a stirring blade, a dropping funnel and a condensing reflux tube. Place the three-neck flask in an ice-water bath. A certain amount of triethylenetetramine (TETA) was weighed, diluted with water to a concentration of 60m%, added into a three-necked flask and stirred. Weigh twice the mole of tetrafluoroboric acid (HBF 4 ), diluted with water to a concentration of 60m%, added to the dropping funnel, slowly dripped into the three-necked flask. After the dropwise addition was completed, stirring was continued for 3 h in an ice-water bath. The reacted liquid was evaporated to remove most of the water, and then dried in a vacuum oven at 60°C for 24 hours to obtain [TETAH 2 ] 2+ 2[BF 4 ] - ionic liquid.

[0041] Carry out infrared spectrum analysis to the ionic liquid of embodiment 1, embodiment 2, compare with TETA standard spectrogram, analysis data record is as follows table.

[0042] ...

Embodiment 3

[0044] The synthesis device of the ionic liquid is the same as above. Place the three-neck flask in an ice-water bath. A certain amount of tetraethylenepentamine (TEPA) was weighed, diluted with water to a concentration of 50m%, added into a three-necked flask and stirred. Weigh an equimolar amount of nitric acid (HNO 3 ), diluted with water to a concentration of 60m%, added to the dropping funnel, slowly dripped into the three-necked flask. After the dropwise addition was completed, stirring was continued for 4 h in an ice-water bath. The reacted liquid was evaporated to remove most of the water, and then dried in a vacuum oven at 60°C for 24 hours to obtain [TEPAH] + [NO 3 ] - ionic liquid.

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Abstract

The invention provides an amido-containing ionic liquid used for absorbing acidic gases and a preparation method and application thereof and in particular relates to a method for absorbing acidic gases of CO2, H2S, SO2 and the like by using an amido-containing ionic liquid. The amido-containing ionic liquid comprises one or more of primary amine, secondary amine and tertiary amine, wherein positive ions of the ionic liquid are derived from organic polyamines, negative ions of the ionic liquid are derived from inorganic acid or organic acid, and the ionic liquid is prepared by mixing the organic polyamines with the inorganic acid or organic acid and then carrying out neutralization reaction through acid and alkali. The ionic liquid has the advantages of low cost, simple preparation method,strong absorbing capability and short balance time, can be used for the enriching of acidic gases, the deacidification refining of acid-containing gases of natural gas, refinery gas, methane, coal gas, synthesis gas, coke-oven gas, pyrolysis gas, smoke, motor vehicle tail gas and the like and the purification of gases under a proper space and an operating environment; meanwhile, the ionic liquid absorbing the acidic gases can release the acidic gases through pressure reduction and temperature raise, thus the absorbing capability of the ionic liquid is restored and the multiple absorption property of the ionic liquid is better.

Description

technical field [0001] The invention relates to an amine-containing functionalized ionic liquid in the field of chemical industry and its preparation method and application, in particular to a method for using the amine-containing ionic liquid to absorb acid gas or perform deacidification and purification of acid-containing gas. Background technique [0002] Natural gas, refinery gas, oilfield associated gas, biogas, coal bed methane, coal gas, synthesis gas, etc. often contain CO 2 、H 2 S and other acid gases, the existence of these acid gases will have a negative impact on the subsequent processing and utilization of the gas, so it needs to be deacidified. In addition, flue gas, motor vehicle exhaust, etc. generally contain CO 2 , SO 2 These acid gases will pollute the air and cause the greenhouse effect, so it is necessary to remove SO before emission 2 , or the CO 2 Wait for collection and storage. The absorption and removal of acidic gases is of great significance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/14C07C209/02C07C309/30C07C303/32C07C63/08C07C53/10C07C51/41B01D53/78B01D53/81B01D53/62B01D53/50B01D53/52
Inventor 刘植昌孟祥海张睿徐春明梁双双
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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