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Method for absorbing SO2 gas by using halogenated alkyl quaternary ammonium salt ionic liquid

A quaternary ammonium salt ion and ionic liquid technology, applied in the field of organic wastewater treatment, can solve the problems of low SO2 solubility, long generation process, high viscosity, etc., and achieve the effects of good environmental and social benefits, high absorption efficiency and low cost.

Inactive Publication Date: 2009-12-16
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But now many ionic liquids studied on SO 2 The solubility is small, and there are limitations such as high viscosity, high synthesis cost, long production process, and serious pollution.

Method used

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  • Method for absorbing SO2 gas by using halogenated alkyl quaternary ammonium salt ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1), the experimental device of synthesizing ionic liquid is reaction kettle, condensing device, stirring device and vacuum drying device. Put the accurately weighed caprolactam into the reaction kettle, turn on the stirrer to stir, and gradually add an appropriate amount of tetrabutylammonium chloride. And react at 80°C for 10h. Then the obtained liquid was dried in a vacuum drying oven at 50° C. for 1 h to finally obtain an ionic liquid of caprolactam-tetrabutylammonium chloride.

[0022] 2) Put the accurately weighed ionic liquid of caprolactam-tetrabutylammonium chloride into the absorber, and keep the temperature constant at 25°C. Feed SO into the absorber at a rate of 10mL / min 2 gas. The outlet of the absorption tail gas is passed into the sodium hydroxide solution to absorb SO 2 exhaust. Weigh the absorber at regular intervals until constant weight. Equilibrium SO 2 The mole fraction solubility in ionic liquid is 0.69.

Embodiment 2

[0024] 1), the experimental device of synthesizing ionic liquid is reaction kettle, condensing device, stirring device and vacuum drying device. Put the accurately weighed caprolactam into the reaction kettle, turn on the stirrer to stir, and gradually add an appropriate amount of ammonium thiocyanate. And react at 80°C for 10h. Then the obtained liquid was dried in a vacuum drying oven at 50° C. for 1 h, and finally the caprolactam-ammonium thiocyanate ionic liquid was obtained.

[0025] 2) Put the accurately weighed caprolactam-ammonium thiocyanate ionic liquid into the absorber, and keep the temperature constant at 50°C. Feed SO into the absorber at a rate of 10mL / min 2 gas. The outlet of the absorption tail gas is passed into the sodium hydroxide solution to absorb SO 2 exhaust. Weigh the absorber at regular intervals until constant weight. Equilibrium SO 2 The mole fraction solubility in ionic liquid is 0.75.

Embodiment 3

[0027] 1), the experimental device of synthesizing ionic liquid is reaction kettle, condensing device, stirring device and vacuum drying device. Put accurately weighed urea into the reaction kettle, turn on the stirrer to stir, and gradually add an appropriate amount of hydroxyethyltrimethylammonium chloride. And react at 120°C for 10h. Then the obtained liquid was dried in a vacuum drying oven at 50° C. for 1 h to finally obtain an ionic liquid of urea-hydroxyethyltrimethylammonium chloride.

[0028] 2) Put an accurately weighed ionic liquid of urea-hydroxyethyltrimethylammonium chloride into the absorber, and keep the temperature constant at 80°C. Feed SO into the absorber at a rate of 10mL / min 2gas. The outlet of the absorption tail gas is passed into the sodium hydroxide solution to absorb SO 2 exhaust. Weigh the absorber at regular intervals until constant weight. Equilibrium SO 2 The mole fraction solubility in ionic liquid is 0.64.

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Abstract

The invention provides a method for absorbing SO2 gas by using halogenated alkyl quaternary ammonium salt ionic liquid, which belongs to the technical field of organic wastewater treatment methods. The method for absorbing the SO2 gas by using the halogenated alkyl quaternary ammonium salt ionic liquid is characterized in that the halogenated alkyl quaternary ammonium salt ionic liquid is used as an absorbent of the SO2 gas to allow the SO2 gas to be absorbed to pass through the ionic liquid or a solution of the ionic liquid or a vector compounded or loaded by the ionic liquid. The method overcomes the drawbacks of the prior art and has the characteristics of unique method, simple technological process, easy operation, high SO2 absorption efficiency, low cost, no secondary pollution, recycling, good effect and wide application range. In addition, the method has the advantages of good economic environmental and social benefits. The synthetic process of the adopted ionic liquid is simple, pollution-free and recyclable, and can recover high-purity SO2 and prepare sulfuric acid.

Description

technical field [0001] The invention relates to the technical field of organic wastewater treatment methods. Background technique [0002] Since the early 1980s, with the development of my country's economy, the demand for energy industry, especially the power industry, has also grown rapidly. As one of the few countries in the world that mainly uses coal, my country's coal consumption is increasing day by day SO 2 The emission of SO has also increased, and my country has become a SO 2 One of the most polluted countries. Flue gas desulfurization is to reduce industrial coal-fired boiler SO 2 The effective method of emission, with the continuous increase in the number of desulfurization equipment and the continuous expansion of the scale, the output of desulfurization by-products has increased sharply, and the problem of its treatment has become increasingly prominent. In the flue gas desulfurization technology currently used in industry, the commonly used methods are wet ...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/78
Inventor 郭斌段二红任爱玲
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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