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Method for reducing sulfur dioxide content in tail gas by using ionic liquid supergravity desulfurization technology

An ionic liquid, sulfur dioxide technology, applied in the chemical industry, can solve the problems of large mass transfer resistance and low absorption efficiency

Inactive Publication Date: 2020-03-31
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at lower temperatures, ionic liquids have high mass transfer resistance due to high viscosity and low absorption efficiency, which is one of the problems that limit the industrial application of ionic liquids.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for reducing the sulfur dioxide content of tail gas by using ionic liquid supergravity desulfurization technology, the specific method is as follows:

[0019] a) Mix caprolactam tetrabutylammonium bromide ionic liquid and polymethylsiloxane in a mass ratio of 4:1 in a pipeline mixer, and store the mixed absorption liquid in an absorption liquid lean liquid storage tank.

[0020] b) The poor liquid of the absorption liquid is heated to 50°C by a heat exchanger, pumped into the rotating packed bed and circulated, and the circulation volume of the absorption liquid is 10m 3 / h; the rotating packed bed maintains a rotating speed of 300r / min, and the tail gas flow rate of the acid plant is 5000m 3 / h and ion-absorbing liquid in the rotating packed bed for supergravity desulfurization reaction, and turn on the ultrasonic dispersion auxiliary equipment (ultrasonic frequency 20kHz) to make the gas-liquid fully contact and react.

[0021] On-line monitoring is carried ...

Embodiment 2

[0023] A method for reducing the sulfur dioxide content of tail gas by using ionic liquid supergravity desulfurization technology, the specific method is as follows:

[0024] a) Mix caprolactam tetrabutylammonium bromide ionic liquid and polydimethylsiloxane in a mass ratio of 3:1 in the pipeline mixer, and store the mixed absorption liquid in the absorption liquid lean liquid storage tank .

[0025] b) The poor liquid of the absorption liquid is heated to 75°C by a heat exchanger, pumped into the rotating packed bed and circulated, and the circulation volume of the absorption liquid is 20m 3 / h; the rotating packed bed maintains a speed of 500r / min, and the tail gas flow rate of the acid plant is 4000m 3 / h and ion-absorbing liquid in the rotating packed bed for supergravity desulfurization reaction, and turn on the ultrasonic dispersion auxiliary equipment (ultrasonic frequency 30kHz) to make the gas-liquid fully contact and react.

[0026] On-line monitoring is carried ou...

Embodiment 3

[0028] A method for reducing the sulfur dioxide content of tail gas by using ionic liquid supergravity desulfurization technology, the specific method is as follows:

[0029] a) Mix caprolactam tetrabutylammonium bromide ionic liquid and polyphenylsiloxane in a mass ratio of 6:1 in a pipeline mixer, and store the mixed absorption liquid in an absorption liquid lean liquid storage tank.

[0030] b) The poor liquid of the absorption liquid is heated to 40°C by a heat exchanger, pumped into the rotating packed bed and circulated, and the circulation volume of the absorption liquid is 15m 3 / h; the rotary packed bed maintains a speed of 700r / min, and the tail gas flow rate of the acid plant is 9000m 3 / h and ion-absorbing liquid in the rotating packed bed for supergravity desulfurization reaction, and turn on the ultrasonic dispersion auxiliary equipment (ultrasonic frequency 15kHz) to fully contact the gas-liquid reaction.

[0031] On-line monitoring is carried out through the o...

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Abstract

The invention belongs to the technical field of chemical engineering, and more specifically relates to a method for reducing sulfur dioxide content in tail gas by using ionic liquid supergravity desulfurization technology. According to the method, caprolactam tetrabutylammonium bromide ionic liquid is used as an absorbent and is matched with a viscosity reducer for use, absorption liquid with a certain concentration is prepared, and tail gas and the absorption liquid are subjected to a supergravity desulfurization reaction in a rotating packed bed. Through the method provided by the invention,more than 99% of sulfur dioxide in flue gas of acid making devices can be removed, the emission concentration of sulfur dioxide is lower than 25mg / m < 3 >, and the method and a device provided by theinvention are simple, are convenient to operate, and can be used for industrial application.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for reducing the sulfur dioxide content of tail gas by using ionic liquid supergravity desulfurization technology. Background technique [0002] In recent years, the scale of industrial production related to sulfuric acid in my country has continued to expand. More and more refining and chemical enterprises no longer favor the traditional Claus sulfur recovery unit, and instead choose the waste gas acid production process. In order to reduce sulfuric acid emissions in the tail gas, the tail gas The application of desulfurization devices is also becoming more and more common. In the sulfuric acid plant, although it is the control principle to ensure the catalyst, ensure the conversion rate, and control the emission of sulfur dioxide up to the standard at the source, due to fluctuations in process control and equipment operation, the tail gas emission ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
CPCB01D53/507
Inventor 张超梁万根曹斌崔卫华刘冠宏
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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