High efficiency wet method for removal of hydrogen sulfide from iron-based ionic liquid

An iron-based ionic liquid, ionic liquid technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of poor product sulfur quality, easy degradation, intensified side reactions, etc., and improve the low-temperature oxidative desulfurization rate. Effect

Inactive Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The common feature of the traditional wet redox desulfurization process is that it is carried out in aqueous solution, especially when it is under alkaline conditions, there are chelating agents that are expensive, easy to degrade, and the side reactions are intensified when the sulfur capacity is high. Problems such as poor sulfur quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 adopts containing [bmim] FeCl 4 and [bmim] 3 PMo 12 o 40 The solution removes H 2 S

[0024] [bmim] 3 PMo 12 o 40 and [bmim]FeCl 4 According to the volume ratio of 1 / 4, prepare 50mL desulfurization ionic liquid. Mixed gas composition H 2 S is 10% (V), N 2 is 90% (V). Pass it into the solution at a flow rate of 30ml / h, and the conversion rate of sulfur is 98% after 5 hours. Then, the previous solution was regenerated by air for 1 hour, and the heating temperature was 40°C. When the mixed gas is fed again under the same conditions as above, the conversion rate of sulfur is 98%. After 4 cycles like this, the oxidation catalytic performance of the solution did not decrease.

Embodiment 2

[0025] Embodiment 2. Adopt containing [bmim] FeCl 4 and [bmim] 3 PW 12 o 40 The solution removes H 2 S

[0026] [bmim] 3 PW 12 o 40 and [bmim]FeCl 4 According to the volume ratio of 1 / 4, prepare 50mL desulfurization ionic liquid. Mixed gas composition H 2 S is 10% (V), N 2 is 90% (V). Pass it into the solution at a flow rate of 30mL / h. After 5h, the conversion rate of sulfur was 99%. Then, the previous solution was regenerated by air for 1 hour, and the heating temperature was 40°C. When the mixed gas is fed again under the same conditions as above, the conversion rate of sulfur is 98%. After 4 cycles like this, the oxidation catalytic performance of the solution did not decrease.

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Abstract

Belonging to the technical field of gas purification, the invention relates to a high efficiency wet method for removal of hydrogen sulfide from iron-based ionic liquid. The desulfurization solution mainly contains iron-based ionic liquid and heteropoly acid ionic liquid, and is immiscible with water. The desulfurization method includes: using the iron-based ionic liquid to absorb and oxidize H2S into elemental sulfur, under the catalysis of the heteropoly acid ionic liquid, employing air to regenerate iron-based ionic liquid, and then subjecting the regenerated iron-based ionic liquid and heteropoly acid ionic liquid to cyclic removal of H2S. Because of the catalytic action of heteropoly acid ionic liquid, the low-temperature oxidation desulfurization rate of the iron-based ionic liquid is greatly improved. According to the invention, the desulfurization solution oxidizes hydrogen sulfide into elemental sulfur, is easy to regenerate, can be recycled, and the desulfurization method has the advantages of simple preparation process, high absorption efficiency, no side reaction, easy recovery of sulfur and the like.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to a method for removing hydrogen sulfide by an efficient wet-process iron-based ionic liquid. Background technique [0002] Hydrogen sulfide is a very harmful impurity in industrial gases such as petrochemical, natural gas, oilfield development, coke oven gas and semi-water gas. Its existence will not only cause corrosion of equipment and pipelines, but also cause serious harm to the environment, and it is a pollutant that must be eliminated or controlled. [0003] Different hydrogen sulfide content can adopt different processes. When the sulfur concentration in the acid gas is high, the alcohol amine absorption-Claus method desulfurization process is more commonly used. When the concentration of hydrogen sulfide is low or the concentration of hydrogen sulfide is high but the gas flow is not large, the wet redox desulfurization process is widely used. The common feature of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/52B01D53/96
Inventor 杨建平朱燕俞健健冯亚平
Owner CHINA PETROLEUM & CHEM CORP
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