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A kind of ionic liquid and its application in sulfur dioxide absorption

An ionic liquid, sulfur dioxide technology, applied in separation methods, organic chemistry, gas treatment, etc., can solve the problems affecting industrial applications, insufficient capture, poor cycle performance, etc., achieve low toxicity, high SO2 absorption, volatilization low sex effect

Active Publication Date: 2022-06-28
BEIJING ZFRK ENVIRONMENT &TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the current method of industrially applied functionalized ionic liquids to capture sulfur dioxide gas, there are generally problems such as insufficient capture capacity, high absorption enthalpy, difficult desorption, and poor cycle performance, which affect its industrial application.

Method used

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  • A kind of ionic liquid and its application in sulfur dioxide absorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 61.08g ethanolamine and 61g water to the flask, take 83.06g phthalic acid in a constant pressure dropping funnel according to the molar ratio of ethanolamine and phthalic acid of 2:1, slowly titrate at room temperature, and heat up to 80°C after the titration is completed. It ends after 3 hours. The ionic liquid solution prepared by the reaction is a pale yellow liquid with good fluidity.

[0026] Mix and dilute the above-mentioned ionic liquid aqueous solution and water by volume 1:1, take 5 ml of the diluted ionic liquid solution and place it in the reaction flask as an absorption solution, adjust the gas flow to 50 ml / min, and put the SO 2 The gas was connected to the reaction flask, and the quality of the absorbing liquid was weighed every 1 min during the absorption process, and the experiment was stopped after 30 min of absorption. SO per gram of ionic liquid 2 The saturated absorption was 0.64 g / g.

Embodiment 2

[0028] Add 105.14g diethanolamine and 105g water to the flask, take 90g 4-methylphthalic acid in a constant pressure dropping funnel according to the molar ratio of diethanolamine and 4-methylphthalic acid 2:1, and titrate slowly at room temperature , after the titration was completed, the temperature was raised to 80 °C and the reaction was completed after about 3h. The ionic liquid solution prepared by the reaction is a dark yellow liquid with good fluidity.

[0029] Mix and dilute the above-mentioned ionic liquid aqueous solution and water by volume 1:1, take 5 ml of the diluted ionic liquid solution and place it in the reaction flask as an absorption solution, adjust the gas flow to 50 ml / min, and put the SO 2 The gas was connected to the reaction flask, and the quality of the absorbing liquid was weighed every 1 min during the absorption process, and the experiment was stopped after 30 min of absorption. SO per gram of ionic liquid 2 The saturated absorption was 0.54 g / ...

Embodiment 3

[0031] Add 129.24g n-octylamine and 130g water to the flask, take 86.09g o-cyclohexanedicarboxylic acid in a constant pressure dropping funnel according to the molar ratio of n-octylamine and o-cyclohexanedicarboxylic acid at 2:1, and titrate slowly at room temperature , after the titration was completed, the temperature was raised to 80 °C and the reaction was completed after about 3h. The ionic liquid solution prepared by the reaction is a dark yellow liquid with good fluidity.

[0032] Mix and dilute the above-mentioned ionic liquid aqueous solution and water by volume 1:1, take 5 ml of the diluted ionic liquid solution and place it in the reaction flask as an absorption solution, adjust the gas flow to 50 ml / min, and put the SO 2 The gas was connected to the reaction flask, and the quality of the absorbing liquid was weighed every 1 min during the absorption process, and the experiment was stopped after 30 min of absorption. SO per gram of ionic liquid 2 The saturated ab...

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Abstract

The invention discloses an ionic liquid and its application in sulfur dioxide absorption, and relates to the technical field of ionic liquid application. The process of absorbing sulfur dioxide is: (1) containing SO 2 The gas is in contact with the absorption liquid before absorption to absorb SO in the gas 2 Form the absorption liquid after absorption; The absorption liquid before absorption comprises described ionic liquid and water; (2) heat and / or reduce pressure to the absorption liquid after absorption, carry out desorption and absorption liquid regeneration; (3) step (2) ) The regenerated absorption liquid is applied to the step (1), and the circulation step (2) and the step (1) realize the recycling of the absorption liquid. The ionic liquid of the present invention has low toxicity, simple synthesis process, convenient large-scale preparation, and can be synthesized by amino, acyl, hydroxyl and SO 2 Intermolecular multi-site hydrogen bonding to achieve SO 2 Efficient absorption, SO can also be absorbed by heating or decompression 2 It is completely desorbed and has good circulation.

Description

technical field [0001] The invention relates to the technical field of ionic liquid applications, in particular to an ionic liquid that can absorb sulfur dioxide in gas. Background technique [0002] Flue gas desulfurization is the main desulfurization method for commercial application in the industry. It has mature technology and diversified process routes. 2 The most important means of pollution. There are various flue gas desulfurization technologies. Countries around the world began to study desulfurization technologies in the 1950s. So far, there are more than 200 desulfurization technologies. The main methods are wet desulfurization, semi-dry desulfurization, dry desulfurization, and rotary spray drying. Desulfurization, electron beam desulfurization and other desulfurization processes. However, the basic principle is to use one or several alkaline substances as desulfurizers, and SO 2 The reaction generates compounds to achieve the purpose of desulfurization. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C63/20C07C63/28C07C61/09C07C215/08C07C215/12C07C211/07C07C211/46B01D53/14
CPCC07C63/20C07C63/28C07C61/09C07C215/08C07C215/12C07C211/07C07C211/46B01D53/1481B01D53/1425B01D2258/0283B01D2252/20421B01D2252/20405B01D2252/20484B01D2252/20489C07C2601/14
Inventor 周志茂李世飞姚大庆许世彬谢博亮
Owner BEIJING ZFRK ENVIRONMENT &TECH CO LTD
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