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A kind of method that ionic liquid containing nitro group is used for absorbing sulfur dioxide gas

A technology of ionic liquid and sulfur dioxide, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as difficult desorption, high absorption enthalpy, and poor cycle performance, so as to avoid loss and volatilization, and increase absorption , the effect of speeding up

Inactive Publication Date: 2016-08-31
HENAN NORMAL UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the current methods of using anion-functionalized ionic liquids to absorb sulfur dioxide, there are generally problems such as insufficient absorption capacity, high absorption enthalpy, difficult desorption, and poor cycle performance, which affect its industrial application.

Method used

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  • A kind of method that ionic liquid containing nitro group is used for absorbing sulfur dioxide gas
  • A kind of method that ionic liquid containing nitro group is used for absorbing sulfur dioxide gas
  • A kind of method that ionic liquid containing nitro group is used for absorbing sulfur dioxide gas

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Select different kinds of tetraalkylphosphine halides, dialkylimidazolium halide salts or tetraalkylammonium halides respectively to form tetraalkylphosphine hydroxides, dialkyl imidazole hydroxides or tetraalkylammonium hydroxides through anion exchange reaction. The formed hydroxides are reacted with different kinds of nitro-containing compounds according to the molar ratio of 1:1 at normal temperature and pressure for 6-24 hours to obtain different kinds of nitro-containing ions as shown in Table 1. liquid.

[0014] In a 5ml glass container with an inner diameter of 1cm, add 0.002mol of the different types of nitro-containing ionic liquids prepared above, and then slowly feed sulfur dioxide gas with a flow rate of 40ml / min, absorb gas pressure at 0.1MPa, and control the temperature at At 20°C, the absorption time is 0.5h for sulfur dioxide absorption. During the absorption process, the electronic analytical balance is used for weighing. The absorption results of sulf...

Embodiment 2

[0019] Add 0.002mol of tetradecyltrihexylphosphine 4-nitrobenzoic acid into a 5ml glass container with an inner diameter of 1cm, then slowly introduce sulfur dioxide gas at a flow rate of 40ml / min, and set different absorption gas pressures and absorption temperatures and absorption time for the absorption of sulfur dioxide gas. During the absorption process, the electronic analytical balance is used for weighing. The absorption results of sulfur dioxide gas are shown in Table 2.

[0020] Table 2 Effects of different absorption conditions on the absorption of sulfur dioxide gas by tetradecyltrihexylphosphine 4-nitrobenzoic acid

[0021]

[0022] Compared with Table 1, combined with Table 2, it can be seen that the absorption amount of sulfur dioxide gas will change significantly depending on the absorption temperature and the absorption gas pressure. The higher the absorption temperature or the lower the absorption gas pressure, the nitro-containing The lower the amount of ...

Embodiment 3

[0024] Slowly feed nitrogen into the tetradecyltrihexylphosphine 4-nitrobenzoic acid that has absorbed sulfur dioxide gas, the flow rate is 40ml / min, the pressure is 0.1MPa, the desorption temperature is controlled at 100°C, and the desorption time is 1.0h . Electronic analytical balance weighing shows that the sulfur dioxide gas absorbed by the nitro-containing ionic liquid has been completely desorbed.

[0025] Use an electronic analytical balance to weigh different types of nitro-containing ionic liquids that have absorbed sulfur dioxide gas and add them to a 5ml glass container with an inner diameter of 1cm, and then slowly feed nitrogen gas with a flow rate of 40ml / min and a pressure of 0.1MPa. The desorption temperature and desorption time, the desorption results are shown in Table 3.

[0026] Table 3 Effects of different kinds of nitro-containing ionic liquids on the desorption of sulfur dioxide gas

[0027]

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Abstract

The invention discloses a method of utilizing a nitryl-containing ionic liquid to absorb sulfur dioxide gas. The nitryl-containing ionic liquid adopted in the method disclosed by the invention is prepared by introducing nitro to anions of the functionalized ionic liquid. According to the method, the anion-strengthened nitro is utilized to react with sulfur dioxide, so as to increase the absorptive amount of sulfur dioxide, and the electron withdrawing property of nitro on the anions is utilized to improve the desorption property of the ionic liquid, so as to realize efficient reversible absorption of sulfur dioxide.

Description

technical field [0001] The invention belongs to the technical field of sulfur dioxide absorption, and in particular relates to a method for absorbing sulfur dioxide gas by using a nitro group-containing ionic liquid. Background technique [0002] In recent years, with the rapid development of economy and society, the sulfur dioxide released by coal combustion has continuously deteriorated the atmospheric environment, and the harm of acid rain has intensified, which has seriously affected human survival and the ecological environment, which has aroused extensive attention from academic and industrial circles at home and abroad. It is urgent to control and reduce the emission of sulfur dioxide gas. Therefore, it is of great significance to develop efficient, reversible, economical and environmentally friendly new materials and new processes for absorbing sulfur dioxide gas. [0003] At present, the use of traditional processes such as limestone, ammonia, and organic solvents ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50
Inventor 崔国凯王键吉张峰涛李志勇裴渊超王慧勇赵玉灵
Owner HENAN NORMAL UNIV
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