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Ionic liquid capable of absorbing sulfur dioxide as well as preparation method and application of ionic 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 reducing desulfurization efficiency, and achieve the effects of good recyclability, good absorption effect, and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2015-12-30
黄锐
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is always a difficult problem in flue gas desulfurization, which is the selection of absorbent. The required absorbent should not only have better absorption and desorption effects, but also have better gas selectivity, and at the same time maintain good stability. enabling it to be reused without reducing desulfurization efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 0.1 mol of metformin and add it into a flask equipped with a magnetic stirring bar, and simultaneously add 20 mL of ethanol as a solvent. Put the flask into a constant temperature oil bath and set it to 10°C; weigh 0.2mol of lactic acid and put it into the normal pressure funnel, the molar ratio of metformin and lactic acid is 1:2, put the normal pressure funnel On the flask, open the normal-pressure funnel, and add lactic acid dropwise to the metformin solution under the condition of stirring, and react for 2 hours after the dropwise addition is completed. After the reaction was completed, the reaction solvent was removed from the reaction solution by rotary evaporation under reduced pressure at 60° C. to obtain a crude product of the ionic liquid. The product can be further purified by being dissolved in ethanol and vacuum-dried to obtain a metformin lactate ionic liquid with a certain viscosity.

[0023] Take a certain amount of metformin lactate ionic liquid a...

Embodiment 2

[0025] Take 0.2 mol of tetramethylguanidine and add it into a flask equipped with a magnetic stirring bar, and simultaneously add 30 mL of ethanol as a solvent. Put the flask into a constant temperature oil bath, and set it to 10°C; weigh 0.1mol of tartaric acid, at this time, the molar ratio of tetramethylguanidine to tartaric acid is 2:1, and under stirring conditions, the Slowly add tartaric acid into the tetramethylguanidine solution, and react for 4 hours after the dropwise addition is completed. After the reaction was completed, the reaction solvent was removed from the reaction solution by rotary evaporation under reduced pressure at 60° C. to obtain a crude product of the ionic liquid. The product can be further purified by dissolving in ethanol and drying in vacuum to finally obtain tetramethylguanidine tartrate ionic liquid.

[0026] Get a certain amount of tetramethylguanidine tartrate ionic liquid and water and join in the absorption device, so that the mass fract...

Embodiment 3

[0028]Take 0.2 mol of ethanolamine and add it into a flask with a magnetic stirring bar, and simultaneously add 30 mL of ethanol as a solvent. Put the flask into a constant temperature oil bath and set it to 10°C; weigh 0.1mol of tartaric acid and put it into the normal pressure funnel, the molar ratio of ethanolamine and tartaric acid is 2:1, put the normal pressure funnel Place it on the flask, open the normal pressure funnel, and add tartaric acid dropwise to the ethanolamine solution under stirring conditions, and react for 3 hours after the dropwise addition is completed. After the reaction was completed, the reaction solvent was removed from the reaction solution by rotary evaporation under reduced pressure at 60° C. to obtain a crude product of the ionic liquid. The product can be further purified by dissolving in ethanol and vacuum drying to finally obtain ethanolamine tartrate ionic liquid with a certain viscosity.

[0029] Take a certain amount of ethanolamine tartr...

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Abstract

The invention discloses ionic liquid capable of absorbing sulfur dioxide as well as a preparation method and application of the ionic liquid. Cations of the ionic liquid are nitrogen-containing organic matters and anions of the ionic liquid are organic acid groups. The nitrogen-containing organic matters are selected from one or ore of guanidine salts, alcamines, imidazoles, pyridines, tetrazoles, quaternary ammonium salts, thiazoles ad dicyandiamides matters; and the organic acid groups are selected from one or more of lactic acid, tartaric acid, citric acid, methanesulfonic acid, trifluoroacetic acid, malic acid, oxalic acid and acetic acid. The ionic liquid disclosed by the invention has a relatively good absorption effect on SO2 and relatively high selectivity. The preparation method is simple, reaction conditions are moderate, the raw materials are cheap and easily available, and the product has stable performances. An absorbent prepared from the ionic liquid has high absorption efficiency, can be cyclically utilized and has good stability, and can be used for absorbing the SO2 in flue gas at a high temperature; and the inactivation of the absorbent, caused by the fact that the ionic liquid is decomposed, is avoided.

Description

technical field [0001] The invention relates to the technical field of ionic liquids, in particular to an ionic liquid for absorbing sulfur dioxide. Background technique [0002] The combustion of chemical fuels such as coal, oil and natural gas will generate sulfur dioxide, nitrogen oxides, dust and other pollutants, among which the pollution produced by coal burning is the most serious. my country is a big coal producing and consuming country, and the burning of a large amount of coal directly threatens the environment on which we live. Sulfur dioxide is the primary pollutant produced by coal combustion, and it is also a gas pollutant with a relatively large content and a wide impact in the current air pollutants. The combustion of sulfur compounds not only seriously affects human health, but also is one of the main causes of smog, acid gas and acid rain. [0003] With the rapid economic development brought about by my country's reform and opening up, the consumption of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 黄锐
Owner 黄锐
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