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New method for desulfurization by oxidation based on alkaline ionic liquid catalyst

A liquid catalyst, basic ion technology, applied in separation methods, chemical instruments and methods, combustible gas purification, etc., can solve problems such as unreported methods

Active Publication Date: 2009-08-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an excellent catalyst, basic ionic liquids have not been reported to catalyze the oxidation-reduction of sulfides.

Method used

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  • New method for desulfurization by oxidation based on alkaline ionic liquid catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Before the experiment, add 10ml of monoethanolamine and 10ml of basic ionic liquid into the equilibrium reaction kettle, and stir evenly. Repeat vacuuming three times to ensure the vacuum in the kettle. Then pass a certain mass ratio of CH into the kettle 4 / H 2 S mixed gas, under the conditions of pressure 0.10MPa and temperature 303K, air is blown in. Detection after 5 hours: CH 4Essentially not absorbed; hydrogen sulfide is absorbed and catalytically oxidized to elemental sulfur. The absorption rate of hydrogen sulfide is above 95%, and the conversion rate of hydrogen sulfide is above 85%. The catalyst was reused 5 times, and the absorption rate and conversion of hydrogen sulfide remained basically unchanged.

Embodiment 2

[0021] Before the experiment, add 10ml of diethanolamine and 10ml of basic ionic liquid into the equilibrium reaction kettle, and stir evenly. Repeat vacuuming three times to ensure the vacuum in the kettle. Then pass a certain mass ratio of CH into the kettle 4 / H 2 S mixed gas, under the conditions of pressure 0.10MPa and temperature 303K, air is blown in. Detection after 5 hours: CH 4 Essentially not absorbed; hydrogen sulfide is absorbed and catalytically oxidized to elemental sulfur. The absorption rate of hydrogen sulfide is above 95%, and the conversion rate of hydrogen sulfide is above 85%. The catalyst was reused 5 times, and the absorption rate and conversion of hydrogen sulfide remained basically unchanged.

Embodiment 3

[0023] Before the experiment, add 10ml of isobutanolamine and 10ml of basic ionic liquid into the equilibrium reaction kettle, and stir evenly. Repeat vacuuming three times to ensure the vacuum in the kettle. Then pass a certain mass ratio of CH into the kettle 4 / H 2 S mixed gas, under the conditions of pressure 0.10MPa and temperature 303K, air is blown in. Detection after 5 hours: CH 4 Essentially not absorbed; hydrogen sulfide is absorbed and catalytically oxidized to elemental sulfur. The absorption rate of hydrogen sulfide is above 95%, and the conversion rate of hydrogen sulfide is above 85%. The catalyst was reused 5 times, and the absorption rate and conversion of hydrogen sulfide remained basically unchanged.

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Abstract

The invention provides a new method for desulfurization by oxidation based on alkaline ionic liquid catalyst. The method comprises the steps as follows: using an absorbent to selectively absorb sulfur compounds, using alkaline ionic liquid as a main catalyst, adding other ionic liquid as a catalyst accelerator, and finally, catalytically oxidising the reductive sulfur compounds in the presence of an oxidant. The method can be used for removing sulphides in gases or wastewater and recovering sulfur. The method has a simple technology, and the catalyst and the absorbent can both be regenerated and recycled, and the recovery rate of elemental sulfur can be more than 85(wt)%.

Description

technical field [0001] The invention relates to a new method of oxidative desulfurization based on an alkaline ionic liquid catalyst, which utilizes an absorbent to selectively absorb sulfur-containing compounds, uses an alkaline ionic liquid as the main catalyst, and adds other ionic liquids as co-catalysts. In the presence of oxygen, hydrogen peroxide, etc.), catalytic redox sulfur-containing compounds (S2 - ), can be applied to the removal of sulfide in gas or wastewater and sulfur recovery. Background technique [0002] Hydrogen sulfide is an irritating and highly toxic gas. Under aerobic and humid heat conditions, it will cause severe corrosion of equipment and pipelines, and catalyst poisoning. Therefore, whether it is natural gas, synthetic gas or water gas, it must be vulcanized before further processing. Hydrogen removal treatment. The general steps of hydrogen sulfide wet removal are: absorption, subsequent conversion (Claus method, etc.), recovery. This method ...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/86B01D53/78B01D53/52C10K1/14
Inventor 张锁江姚宏玮张香平刘龙彭雷
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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