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Method for absorbing sulfur dioxide gas through double-function chelating type ion liquid

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 the problems of low stability, volatility, and low absorption, and achieve good stability, simple synthesis, and good application prospects Effect

Inactive Publication Date: 2018-12-18
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyethylene glycol, a commonly used ligand, has been used as a physical absorbent in industrial sulfur dioxide recovery devices due to its go

Method used

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  • Method for absorbing sulfur dioxide gas through double-function chelating type ion liquid
  • Method for absorbing sulfur dioxide gas through double-function chelating type ion liquid
  • Method for absorbing sulfur dioxide gas through double-function chelating type ion liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Select different types of lithium salt and tris(3,6-dioxaheptyl)amine according to the molar ratio of 1:1, mix them at room temperature and pressure, and stir for 6-24 hours to obtain the corresponding bifunctional chelating type Ionic liquid. Into a 5mL glass container with an inner diameter of 1cm, respectively add 1g of the bifunctional chelating ionic liquid prepared above, and then slowly introduce sulfur dioxide gas with a flow rate of 60mL / min, an absorption gas pressure of 0.1MPa, and a control temperature of 20℃. Absorbed for 0.5h respectively, and weighed with an electronic analytical balance during the absorption process. The absorption results of sulfur dioxide gas are shown in Table 1.

[0016] Table 1 The effect of chelating ionic liquid formed by three (3,6-dioxaheptyl) amine chelating different lithium salts on sulfur dioxide gas absorption

[0017]

Embodiment 2

[0019] Add 1g of tris(3,6-dioxaheptyl)amine chelated lithium thiocyanate ionic liquid into a 5mL glass container with an inner diameter of 1cm, and then slowly introduce sulfur dioxide gas at a flow rate of 60mL / min, with different settings The absorption temperature, absorption gas pressure and absorption time are used for the absorption of sulfur dioxide gas, and the absorption process is weighed by an electronic analytical balance. The absorption results of sulfur dioxide gas are shown in Table 2.

[0020] Table 2 The influence of different absorption conditions on the absorption of sulfur dioxide gas by chelating ionic liquids

[0021]

[0022]

[0023] It can be seen from Table 2 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 dual-function chelating ionic liquid absorbs sulfur dioxide. The lower...

Embodiment 3

[0025] Add 1g of tris(3,6-dioxaheptyl)amine chelated lithium thiocyanate ionic liquid into a 5mL glass container with an inner diameter of 1cm, and then slowly introduce sulfur dioxide gas with a flow rate of 60mL / min and an absorption gas pressure of 0.1MPa, controlled adsorption temperature of 70℃, absorption time of 0.5h, controlled desorption temperature of 100℃, desorption time of 0.5h under nitrogen purge conditions, and measured the effect of this dual-functional chelating ionic liquid on high-temperature sulfur dioxide gas The circulating absorption capacity. The absorption process and the desorption process are weighed by an electronic analytical balance. The results of the cycle absorption of high-temperature sulfur dioxide gas are shown in Table 3.

[0026] Table 3 Cyclic absorption of high-temperature sulfur dioxide gas by dual-functional chelating ionic liquids

[0027]

[0028] It can be seen from Table 3 that the bifunctional chelating ionic liquid tris(3,6-dioxahep...

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Abstract

The invention discloses a method for absorbing sulfur dioxide gas through double-function chelating type ion liquid. According to the method disclosed by the invention, a lithium salt compound containing functional anions and an ether group polymer containing a functional group are mixed according to an equal mol ratio and are stirred to react and synthesize the double-function chelating type ionliquid; the double-function chelating type ion liquid is used for efficiently and reversibly absorbing high-temperature sulfur dioxide gas; the ion liquid has the advantages of simplicity in synthesisand high stability, and has a rapid absorption speed on the high-temperature sulfur dioxide gas, high absorption amount and good circulating reversibility.

Description

Technical field [0001] The invention belongs to the technical field of sulfur dioxide absorption, and specifically relates to a method for absorbing sulfur dioxide gas by a dual-function chelating ionic liquid. Background technique [0002] In recent years, the sulfur dioxide released by the burning of fossil fuels has aggravated air pollution. Sulfur dioxide combines with atmospheric water vapor to form acid rain, which affects economic and social development, human survival and the ecological environment, which has attracted widespread attention from academic and industrial circles at home and abroad. People urgently demand to control and reduce the emission of sulfur dioxide gas. Therefore, it is of great significance to develop high-efficiency, reversible, economic and environmentally friendly new materials and new processes for absorbing and storing sulfur dioxide gas. [0003] At present, the use of limestone / gypsum and other traditional processes to absorb sulfur dioxide ga...

Claims

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Application Information

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IPC IPC(8): B01D53/18
CPCB01D53/1425B01D53/1481B01D53/18B01D2252/30
Inventor 张瑞娜杨喜美崔国凯
Owner HENAN NORMAL UNIV