Green high-efficiency recyclable SO2 gas absorbent and preparation thereof

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

Inactive Publication Date: 2008-09-17
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 patent document uses amino acid ionic liquid to absorb acid gas, mainly to absorb CO 2

Method used

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  • Green high-efficiency recyclable SO2 gas absorbent and preparation thereof
  • Green high-efficiency recyclable SO2 gas absorbent and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The experimental device is mainly composed of a three-necked flask with a condensing reflux pipe on it, and is equipped with a sealed dropping funnel and a stirring device. The molar ratio of oxalic acid decrystallized water to triethylamine is 1:2, and ethanol is used as a solvent. The temperature was controlled at 25°C, triethylamine was added dropwise, and reacted at 25°C for 10 hours. The mixed liquid was rotatably distilled under reduced pressure at 70°C to remove unreacted raw materials and solvents, and finally a light yellow solid of triethylamine oxalic acid was obtained.

[0031] Accurately weigh the solid triethylamine oxalic acid, dissolve it in a small amount of ethanol, mix it with an equal amount of activated carbon, evaporate the solvent at 70°C, then put the mixture into the absorber, and pass sulfur dioxide gas into the absorber at room temperature for SO 2 Absorption; place the ionic liquid with absorption equilibrium in an environment of 80°C for SO...

Embodiment 2

[0033] Assemble the three-neck flask, condensing reflux tube, sealing dropping funnel and stirring device together. The molar ratio of malonic acid to triethylamine is 1:2, and ethanol is used as a solvent. The temperature was controlled at 10°C, triethylamine was added dropwise, and the reaction was carried out for 10 hours. The mixed liquid was rotatably distilled under reduced pressure at 70° C. to remove unreacted raw materials and solvents, and finally a colorless ionic liquid of triethylamine malonate was obtained with a yield of 86.5%.

[0034] Accurately weigh the triethylamine malonate ionic liquid and place it in the absorber, place the absorber in a constant temperature system at 25°C, and feed SO into the absorber 2 gas, the ionic liquid turns yellow and transparent, and the ionic liquid with absorption balance is placed in an environment of 90°C for SO 2 In the desorption test, the equilibrium absorption capacity reached 94.2% in 1 hour, and the desorption equil...

Embodiment 3

[0036] The experimental device is mainly composed of a three-necked flask with a condensing reflux pipe on it, and is equipped with a sealed dropping funnel and a stirring device. The molar ratio of succinic acid to triethylamine is 1:2, and distilled water is used as a solvent to react at 40° C. for 10 hours. Heating at 140° C. removes unreacted raw materials and solvents, and finally obtains a light yellow ionic liquid of triethylamine succinic acid.

[0037] Accurately weigh the triethylamine succinic acid ionic liquid and place it in the absorber, place the absorber in a constant temperature system at 10°C, and feed SO into the absorber 2 Gas, with crystals produced. The ionic liquid with absorption equilibrium was placed in an environment of 100 °C for SO 2 In the desorption test, the theoretical adsorption capacity can reach 93.4% in 3 hours, and it can be completely desorbed in 2 hours. SO absorption after 50 cycles 2 The molar ratio to triethylamine succinic acid i...

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Abstract

The invention relates to a high-efficient and circulatory SO2 air absorbent and preparation method. The absorbent is an alkaline ionic liquid comprising dicarboxylate of amine shown by the following chemical formulas, wherein, R1, R2, R3, R5, R6, R7 from the alkyl of C1 - C8 or the replace alkyl or hydrogen (H), R4 from CnH2n-2 or the alkyl of CmH2m or the replace hydroxyl; wherein, n=2-8, m=0-8. The preparation method of the absorbent takes amine and dicarboxylate acid as raw materials and comprises a direct action in solvent or without solvent. The ratio of the absorption capacity of SO2 and absorbent molar volume is as high as 2:1; the SO2 can be desorbed for a plurality of times and can be recycled, and achieves rapid absorption and desorption balance; the desorption ratio is more than 90%.

Description

1. Technical field [0001] The present invention relates to a kind of gas absorbent and preparation method thereof, specifically a kind of recyclable SO 2 Gas absorbent and its preparation and adsorption-desorption treatment. 2. Background technology [0002] SO 2 It is an acidic gas, which can be transformed into sulfur-containing acidic substances and other pollutants in the atmosphere, which has harmful effects on human health and the ecological environment. In recent years, my country's atmospheric SO 2 The pollution is so serious that our country has become the world's largest SO 2 One of the most polluted countries. How to Economically and Effectively Control SO in Coal Combustion Process and Industrial Flue Gas 2 The emission is a key issue that urgently needs to be solved in the field of energy and environmental protection in my country and even in the world. Flue gas desulfurization technology (FGD) is considered to control coal-fired SO 2 One of the most effi...

Claims

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Application Information

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IPC IPC(8): B01D53/14
Inventor 李学良席俊松罗梅汪华陈祥迎陈洁洁
Owner HEFEI UNIV OF TECH
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