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Room temperature ionic liquid, method and device for removing sulfur dioxide and carbon dioxide in tail gas

A room temperature ionic liquid, carbon dioxide technology, applied in the field of chemical engineering, can solve the problems of high cost, complex sulfur dioxide and carbon dioxide processes, etc., and achieve the effects of low cost, high use value and easy operation

Active Publication Date: 2018-04-03
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims to provide a method and device for removing sulfur dioxide and carbon dioxide in tail gas by room temperature ionic liquid and room temperature liquid, so as to solve the technical problems of complex and high cost removal process of sulfur dioxide and carbon dioxide in tail gas in the prior art

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  • Room temperature ionic liquid, method and device for removing sulfur dioxide and carbon dioxide in tail gas

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Embodiment 1

[0053] The tail gas inlet of the tail gas purification tower in embodiment 1 passes into the carbon dioxide concentration in the tower to be 24wt%, and the sulfur dioxide concentration is 32g / m 3 The exhaust gas is introduced at a superficial flow rate of 0.1cm / s (exhaust gas temperature is 40°C and pressure is 0.1MPaG). The exhaust gas first enters the exhaust gas distributor, and the exhaust gas enters from the lower phase room temperature ionic liquid B (abbreviated as the lower phase) Phase room temperature ionic liquid A (referred to as the upper phase) overflows, and the loaded upper and lower phase ionic liquids are recycled after washing with alkali and water. Wherein, 95%wt quaternary ammonium salt ionic liquid, lower phase 5%wt[C 4 mim]Br / FeCl 3 . Finally, the purified exhaust gas from the power plant is discharged into the atmosphere. After testing, the concentration of carbon dioxide in the purified tail gas is 1.31wt%; the concentration of sulfur dioxide is 0.7...

Embodiment 2

[0055] In embodiment 2, the tail gas inlet of the tail gas purification tower leads to the carbon dioxide concentration in the tower is 15wt%, and the sulfur dioxide concentration is 40g / m 3 Exhaust gas, the gas superficial flow rate is 1cm / s (exhaust gas temperature 40 ℃, pressure 0.5MPaG), the exhaust gas first enters the exhaust gas distributor, the exhaust gas enters from the lower phase, overflows from the upper phase, and the loaded upper and lower phase ionic liquid passes through Recycled after alkali washing and water washing. Among them, 75%wt pyrrole salt ionic liquid, lower phase 25%wt[C 4 mim] BF 4 / FeCl 3 . Finally, the purified exhaust gas from the power plant is discharged into the atmosphere. After testing, the concentration of carbon dioxide in the purified tail gas is 0.79wt%; the concentration of sulfur dioxide is 0.81g / m 3 .

Embodiment 3

[0057] In embodiment 3, the tail gas inlet of the tail gas purification tower leads to the carbon dioxide concentration in the tower is 30wt%, and the sulfur dioxide concentration is 10g / m 3 The exhaust gas is introduced at a superficial velocity of 7cm / s (exhaust gas temperature 40°C, pressure 1MPaG), the exhaust gas first enters the exhaust gas distributor, the exhaust gas enters from the lower phase, overflows from the upper phase, and the loaded upper and lower phase ionic liquids pass through Recycled after alkali washing and water washing. Wherein, 85%wt quaternary ammonium salt ionic liquid, lower phase 15%wt[C 4 mim] BF 4 / FeCl 3 . Finally, the purified exhaust gas from the power plant is discharged into the atmosphere. After testing, the concentration of carbon dioxide in the purified tail gas is 1.81wt%; the concentration of sulfur dioxide is 1.11g / m 3 .

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Abstract

The invention discloses a room-temperature ionic liquid as well as a method and a device for removing sulfur dioxide and carbon dioxide in tail gas by the room-temperature ionic liquid. The method comprises the following steps: removing the sulfur dioxide and the carbon dioxide in the tail gas by adopting the room-temperature ionic liquid, wherein the room-temperature ionic liquid is prepared from the following components in parts by weight: 30-95 parts of upper-phase room-temperature ionic liquid A and 5-70 parts of lower-phase room-temperature ionic liquid B; cations in the upper-phase room-temperature ionic liquid A are pyrrole salt ions or quaternary ammonium salt ions; anions in the upper-phase room-temperature ionic liquid A are tetrafluoroborate ions or hexafluorophosphate ions; and the lower-phase room-temperature ionic liquid B is [Cnmim]Br / FeCl3, [Cnmim]BF4 / FeCl3 or [Cnmim]PF6 / FeCl3, wherein n is equal to 4, 6, 8, 10 or 12. Only if the tail gas containing the sulfur dioxide and the carbon dioxide is introduced into the room-temperature ionic liquid, the sulfur dioxide and the carbon dioxide can be removed, so that the operation is simple and convenient and the cost is low.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a method and a device for removing sulfur dioxide and carbon dioxide in tail gas by a room temperature ionic liquid and a room temperature liquid. Background technique [0002] Power plant exhaust contains a large amount of CO 2 and SO 2 , if it is discharged directly without treatment, it will cause great pollution to the atmospheric environment. At present, carbon capture technology and desulfurization process technology (FGD) are mainly used to treat the tail gas of power plants. [0003] The current carbon capture technology mainly uses chemical adsorption. Carbon dioxide reacts with amines, and the two combine at low temperatures and separate at high temperatures. Generally, the exhaust gas containing carbon dioxide can be passed through the amine liquid, the carbon dioxide in it can be separated, and then the carbon dioxide can be released by heating the am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/62
CPCB01D53/50B01D53/62B01D53/78B01D2257/302B01D2257/504B01D2259/124
Inventor 李红吴勇
Owner CHNA ENERGY INVESTMENT CORP LTD