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

A technology of cyclohexyldiamine and ionic liquid, which is applied in the absorption of sulfur dioxide in gas by cyclohexyldiamine ionic liquid, and the application field of ionic liquid, which can solve the problems of insufficient capture capacity, impact on industrial application, and poor cycle performance. Achieve the effect of high SO2 absorption, low toxicity and low volatility

Active Publication Date: 2021-05-18
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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 cyclohexyl diamine ionic liquid and its application in sulfur dioxide absorption
  • A kind of cyclohexyl diamine ionic liquid and its application in sulfur dioxide absorption
  • A kind of cyclohexyl diamine ionic liquid and its application in sulfur dioxide absorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 58.57g of 1,3-cyclohexanedimethylamine and 58.5g of water into the flask, take 37.09g of lactic acid and 40.39g of sulfuric acid in a constant pressure dropping funnel, slowly titrate at room temperature, after the titration is completed, the temperature is raised to 80°C and the reaction is completed for 3 hours . The ionic liquid solution prepared by the reaction is light yellow liquid with good fluidity.

[0027] 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 0.67g / g.

Embodiment 2

[0029] Add 55.72g of 1,3-cyclohexanedimethylamine and 55.7g of water into the flask, and take 70.57g of lactic acid in a constant pressure dropping funnel according to the molar ratio of 1,3-cyclohexanedimethylamine and lactic acid of 1:2. Slowly titrate, and after the titration is completed, the temperature is raised to 80°C and the reaction is completed for about 3 hours. The ionic liquid solution prepared by the reaction is dark yellow liquid with good fluidity.

[0030] 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...

Embodiment 3

[0032] Add 17.13g of malic acid into the flask, react according to the molar ratio of 1,4-cyclohexanedimethylamine and malic acid at 1:1, weigh 18.17g of 1,4-cyclohexanedimethylamine and add double water (36.34g) to mix Add evenly into the flask, stir and heat, and raise the temperature to 80°C. At this time, malic acid gradually dissolves. After stirring and reacting at 80°C for 3 hours, the reaction ends. The ionic liquid is light yellow, with good fluidity and low viscosity.

[0033] 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 saturate...

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Abstract

The invention discloses a cyclohexyldiamine ionic liquid and its application in sulfur dioxide absorption, belonging 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 cyclohexyl diamine ionic liquid and water; (2) heat and / or depressurize the absorption liquid after absorption, carry out desorption and absorption liquid regeneration; (3) The absorption liquid regenerated in the step (2) is applied to the step (1), and the circulation step (2) and the step (1) realize the recycling of the absorption liquid. The cyclohexyldiamine ionic liquid of the present invention has low toxicity, simple synthesis process, convenient large-scale preparation, and can be synthesized by amino group, aldehyde group, hydroxyl group 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 application, in particular to the application of cyclohexyldiamine ionic liquid in the field of absorbing sulfur dioxide in gas. Background technique [0002] Sulfur dioxide emissions and acid rain pollution will have a serious impact on the ecological environment and human health, and the control of sulfur dioxide emissions in the gas is the main task of air pollution control. Therefore, it is urgent to control and reduce the emission of sulfur dioxide gas, and it is of great significance to develop efficient and environmentally friendly new materials and new processes for capturing and recovering sulfur dioxide. [0003] At present, the use of traditional processes such as limestone, ammonia, and organic solvents to capture sulfur dioxide gas has the advantages of low cost, fast capture speed, and large capture volume. Grade by-products, collectors are not easy to regenerate, etc., which d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C211/17B01D53/14
CPCC07C211/17B01D53/1493B01D53/1481B01D53/1425B01D2252/30
Inventor 周志茂李世飞张香平张锁江许世彬
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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