Cyclic amine sulfur dioxide gas absorbent and preparation method thereof

A gas absorbent and absorbent technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of unfavorable industrialization and high cost of amino acid ionic liquids, achieve low operating costs, improve desulfurization effect, and reduce SO2 The effect of high removal rate

Inactive Publication Date: 2009-09-23
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application number is 200510073345.0. The Chinese patent document uses amino acid ionic liquid to absorb acid gas, mainly to absorb CO 2 gas, no SO 2 Absorption example, the cost of the prepared amino acid ionic liquid is high, which is not conducive to industrialization. The amino acid ionic liquid synthesized in this patent document is an imidazole-type ionic liquid, which uses amino acid as a group and is connected to a nitrogen atom of the five-membered ring superior

Method used

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  • Cyclic amine sulfur dioxide gas absorbent and preparation method thereof
  • Cyclic amine sulfur dioxide gas absorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The three-necked flask, condensing reflux tube, capped dropping funnel and stirring device are assembled together. The molar ratio of hexamethylenetetramine to formic acid is 1:4, and ethanol is used as the solvent. The temperature was controlled at 50°C, the formic acid solution was added dropwise, and the reaction was carried out for 10 hours. The solvent and excess raw materials were removed by rotating the mixed liquid under reduced pressure at 60°C, and the obtained liquid was put into a vacuum drying oven at 50°C for 36 hours, and finally a colorless ionic liquid of hexamethylenetetramine was obtained. Place the absorbent in a vacuum drying oven at 50°C for later use.

[0023] Accurately weigh the hexamethylenetetramine ionic liquid and place it in the absorber. The absorber is placed in a constant temperature system at 10°C, and SO is introduced into the absorber. 2 The gas, the absorbent becomes a viscous liquid, the absorption equilibrium can be reached within 2 ho...

Embodiment 2

[0027] The three-necked flask, condensing reflux tube, capped dropping funnel and stirring device are assembled together. The molar ratio of hexamethylenetetramine to acetic acid is 1:4, and ethanol is used as the solvent. The temperature was controlled at 90°C, acetic acid solution was added dropwise, and the reaction was carried out for 2 hours. The mixed liquid was subjected to reduced-pressure rotary distillation at 70°C to remove the solvent and excess raw materials, and the obtained liquid was put into a vacuum drying oven at 50°C for 36 hours, and finally the hexamethylenetetramine acetic acid ionic liquid was obtained. Place the absorbent in a vacuum drying oven at 50°C for later use.

[0028] Accurately weigh the hexamethylenetetramine acetic acid ionic liquid and place it in the absorber. The absorber is placed in a constant temperature system at 25°C, and SO is introduced into the absorber. 2 Gas, the absorption equilibrium can be reached within 1.5 hours.

[0029] Plac...

Embodiment 3

[0031] According to the molar ratio of imidazole to formic acid of 1:2, put it in a polytetrafluoroethylene liner, then put it in an autoclave, and react at 120°C for 10 hours. The obtained mixture was then placed in a vacuum drying oven at 100°C for 24 hours, and finally a colorless ionic liquid of imidazole carboxylic acid was obtained. Place the absorbent in a vacuum drying oven at 50°C for later use.

[0032] Accurately weigh the imidazole formic acid ionic liquid and place it in the absorber. The absorber is placed in a constant temperature system at 30°C, and SO is introduced into the absorber. 2 Gas, the absorbent turns into a yellow transparent liquid, and the absorption equilibrium can be reached within 2 hours.

[0033] Place the ionic liquid with absorption equilibrium in an environment of 100℃ for SO 2 Desorption test, absorption of SO 2 The mole fraction of is 0.6847, and the desorption rate in 1 hour is 94.00%.

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Abstract

The invention provides a cyclic amine SO2 gas absorbent and a preparation method thereof, wherein the absorbent is an ion liquid with a cation belonging to cyclic amines; a chemical formula at the right side shows a cyclic amine short chain carboxylate, wherein CA is the cyclic amine; and R is H or C1-C2 alkyl. The preparation method of the absorbent is characterized in that the cyclic amine and the short chain carboxylate are taken as raw materials, and the reaction is carried out in a solvent or carried out directly without a solvent. The absorption amount of the SO2 is increased with the increment of the amount of the functional nitrogen; furthermore, the absorbent can be circularly used repeatedly by desorption, can achieve balanced absorption and desorption quickly, and desorption rate within 1 hour is more than 90% and the absorbent can be used for acidic gasses such as SO2, and the like.

Description

1. Technical Field [0001] The invention relates to a gas absorbent and a preparation method thereof, in particular to a recyclable SO 2 Gas absorbent and its preparation method and absorption and desorption treatment. 2. Background technology [0002] Room temperature ionic liquids generally refer to substances that are composed of relatively large organic cations and relatively small inorganic or organic anions, and are liquid at or near room temperature. Because it has many special physical and chemical properties that are different from molecular solvents, such as strong electrostatic field, almost no vapor pressure, high conductivity, good electrochemical stability, designability, etc., room temperature ionic liquids are a new type of green Solvents and "soft" functional materials have been widely used in the fields of organic synthesis, catalysis science, separation analysis, electrochemistry, and materials science. As a functional medium and material, ionic liquids will als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50
Inventor 李学良席俊松汪华罗梅陈洁洁段体兰
Owner HEFEI UNIV OF TECH
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