Ionic liquid and application thereof in sulfur dioxide absorption

A technology of ionic liquid and sulfur dioxide, which is applied in separation methods, gas treatment, organic chemistry, etc., can solve problems such as insufficient capture capacity, impact on industrial applications, poor cycle performance, etc., and achieve high SO2 absorption, low toxicity, and volatile Sexually low effect

Active Publication Date: 2020-11-06
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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  • Ionic liquid and application thereof in sulfur dioxide absorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0026] Mix and dilute the above-mentioned ionic liquid aqueous solution and water at a volume of 1:1, take 5ml of the diluted ionic liquid solution as an absorption liquid and put it in a reaction bottle, adjust the gas flow rate to 50ml / min, and dissolve the SO 2 The gas was connected to the reaction bottle, and the mass of the absorption 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 is 0.64g / g.

Embodiment 2

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

[0029] Mix and dilute the above-mentioned ionic liquid aqueous solution and water at a volume of 1:1, take 5ml of the diluted ionic liquid solution as an absorption liquid and put it in a reaction bottle, adjust the gas flow rate to 50ml / min, and dissolve the SO 2 The gas was connected to the reaction bottle, and the mass of the absorption 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 is 0.54g / g.

Embodiment 3

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

[0032] Mix and dilute the above-mentioned ionic liquid aqueous solution and water at a volume of 1:1, take 5ml of the diluted ionic liquid solution as an absorption liquid and put it in a reaction bottle, adjust the gas flow rate to 50ml / min, and dissolve the SO 2 The gas was connected to the reaction bottle, and the mass of the absorption 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 is 0.60g / g.

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Abstract

The invention discloses an ionic liquid and application thereof in sulfur dioxide absorption, and relates to the technical field of ionic liquid application. The process of absorbing sulfur dioxide comprises the following steps: (1) gas containing SO2 is in contact with absorption liquid before absorption so that SO2 in the gas is absorbed to form absorption liquid after absorption, wherein the absorption liquid before absorption contains the ionic liquid and water; (2) heating and / or decompressing the absorbed absorption liquid to desorb and regenerate the absorption liquid; and (3) applyingthe absorption liquid regenerated in the step (2) to the step (1), and circulating the step (2) and the step (1) to realize cyclic utilization of the absorption liquid. The ionic liquid is low in toxicity, simple in synthesis process and convenient for large-scale preparation, SO2 can be efficiently absorbed through multi-site hydrogen-bond interaction among amino groups, acyl groups, hydroxyl groups and SO2 molecules, SO2 can be completely desorbed in a heating or decompression mode, and the cyclicity is good.

Description

technical field [0001] The invention relates to the technical field of ionic liquid application, in particular to an ionic liquid capable of absorbing sulfur dioxide in gas. Background technique [0002] Flue gas desulfurization is the main desulfurization method for commercial application in industry. It has mature technology and diversified process routes. It is currently the most important method for controlling acid rain and SO 2 The most important means used by pollution. There are many kinds of 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 S...

Claims

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Application Information

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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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