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Method for catching sulfur dioxide by adopting halogenated carboxylic acid ion liquid

A technology of halogenated carboxylic acid and ionic liquid, which is applied in the field of sulfur dioxide absorption, can solve the problems of difficult desorption, high absorption enthalpy, poor cycle performance, etc., and achieve the effects of avoiding loss and volatilization, increasing absorption, and speeding up

Inactive Publication Date: 2015-09-23
HENAN NORMAL UNIV
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  • Abstract
  • 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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  • Method for catching sulfur dioxide by adopting halogenated carboxylic acid ion liquid
  • Method for catching sulfur dioxide by adopting halogenated carboxylic acid ion liquid
  • Method for catching sulfur dioxide by adopting halogenated carboxylic acid ion liquid

Examples

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Comparison scheme
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 halogenated carboxylic acid compounds according to the molar ratio of 1:1 at normal temperature and pressure for 6-24 hours to obtain different kinds of halogenated carboxylate 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 halocarboxylate ionic liquids prepared above, and then slowly introduce sulfur dioxide gas at a flow rate of 40mL / min, absorbing the gas pressure at 0.1MPa, and controlling 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. ...

Embodiment 2

[0019] Add 0.002mol of tetradecyltrihexylphosphine 6-bromohexanoic acid into a 5mL glass container with an inner diameter of 1cm, and then slowly introduce sulfur dioxide gas at a flow rate of 40mL / min. Set different absorption gas pressure, absorption temperature and The absorption time is for the absorption of sulfur dioxide gas, and the electronic analytical balance is used for weighing during the absorption process. 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-bromohexanoic 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 halogenated carboxyl The lower the...

Embodiment 3

[0024] Nitrogen gas is slowly introduced into the tetradecyltrihexylphosphine 6-bromohexanoic acid that has absorbed sulfur dioxide gas, the flow rate is 40mL / min, the pressure is 0.1MPa, the desorption temperature is controlled at 120°C, and the desorption time is 0.5h. Electronic analytical balance weighing shows that the sulfur dioxide gas absorbed by the halogenated carboxylate ionic liquid has been completely desorbed.

[0025] Weigh different kinds of halogenated carboxylate ionic liquids that have absorbed sulfur dioxide gas with an electronic analytical balance 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 halocarboxylate ionic liquids on the desorption of sulfur dioxide gas

[0027]

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Abstract

The invention discloses a method for catching sulfur dioxide by adopting a halogenated carboxylic acid ion liquid. According to the halogenated carboxylic acid ion liquid, halogen is introduced onto carboxylic acid negative ions of a functionalized ionic liquid, the absorbing capacity of sulfur dioxide is improved by utilization of the action of halogen reinforced onto the negative ions and sulfur dioxide, and the electron absorption property of the halogen on the negative ions is utilized to improve the desorption property of carboxylic acid ion liquid, so that efficient reversible absorption of the sulfur dioxide can be realized.

Description

technical field [0001] The invention belongs to the technical field of sulfur dioxide absorption, and in particular relates to a method for trapping sulfur dioxide by using a halogenated carboxylate 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. Therefore, there is an urgent need 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 to absorb sulfur dioxide gas has the advantages of low cost, fast absorption ...

Claims

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Application Information

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IPC IPC(8): B01D53/14
Inventor 崔国凯张瑞娜黄艳杰张峰涛王键吉
Owner HENAN NORMAL UNIV
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