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Recyclable sulfur dioxide gas absorbent and preparation method thereof

A gas absorbent, sulfur dioxide technology, applied in chemical instruments and methods, separation methods, dispersed particle separation and other directions, can solve the problems of unfavorable industrialization and high cost of amino acid ionic liquids, achieve low operating costs, improve desulfurization effect, synthesis conditions mild effect

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 unfavorable for industrialization

Method used

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  • Recyclable sulfur dioxide gas absorbent and preparation method thereof
  • Recyclable sulfur dioxide gas absorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Assemble the three-neck flask, condensing reflux tube, sealing dropping funnel and stirring device together. The molar ratio of diethylenetriamine to formic acid is 1:3, and water is used as a solvent. The temperature was controlled at 60° C., formic acid solution was added dropwise, and the reaction was carried out for 12 hours. The mixed liquid was decompressed and rotated at 80°C to remove the solvent and excess raw materials, and the obtained liquid was placed in a vacuum oven at 50°C for 24 hours to finally obtain a yellow ionic liquid of diethylenetriamine formic acid. The absorbent was placed in a vacuum oven at 50°C for use.

[0028] Accurately weigh the ionic liquid of diethylenetriamine formate and place it in the absorber, place the absorber in a constant temperature system at 30°C, and feed SO into the absorber 2 gas, the absorbent turns yellow and transparent, and can reach 98.35% of the equilibrium absorption in 1 hour, diethylenetriamine formic acid abs...

Embodiment 2

[0032] Assemble the three-neck flask, condensing reflux tube, sealing dropping funnel and stirring device together. The molar ratio of triethylenetetramine to formic acid is 1:4, and ethanol is used as a solvent. The temperature was controlled at 90° C., formic acid solution was added dropwise, and the reaction was carried out for 6 hours. The mixed liquid was decompressed and rotated at 50°C to remove the solvent and excess raw materials, and the obtained liquid was placed in a vacuum oven at 50°C for 36 hours to finally obtain a yellow ionic liquid of triethylenetetramine formic acid. The absorbent was placed in a vacuum oven at 50°C for use.

[0033] Accurately weigh the triethylenetetramineformic acid ionic liquid and place it in the absorber, place the absorber in a constant temperature system at 30°C, and feed SO into the absorber 2 gas, the absorbent turns yellow and transparent, and can reach 99.54% of the equilibrium absorption in 1 hour, triethylenetetramine formic...

Embodiment 3

[0036]Assemble the three-neck flask, condensing reflux tube, sealing dropping funnel and stirring device together. The molar ratio of tetraethylenepentamine to formic acid is 1:5, and ethanol is used as a solvent. The temperature was controlled at 60°C, and formic acid solution was added dropwise, and reacted for 10 hours. The mixed liquid was decompressed and rotated at 50°C to remove the solvent and excess raw materials, and the obtained liquid was put into a vacuum oven at 50°C for 36 hours to finally obtain a brown-yellow ionic liquid of tetraethylenepentaamine formate. The absorbent was placed in a vacuum oven at 50°C for use.

[0037] Accurately weigh the ionic liquid of tetraethylenepentamine formate and place it in the absorber, place the absorber in a constant temperature system at 30°C, and feed SO into the absorber 2 gas, the absorbent turns yellow and transparent, and can reach 98.27% of the equilibrium absorption in 1 hour, tetraethylenepentamine formic acid abs...

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Abstract

The invention provides a recyclable sulfur dioxide gas absorbent and a preparation method thereof, wherein the absorbent is an ion liquid with a cation belonging to a multi-nitrogen straight chain amine, which is shown by a chemical formula at the right side, wherein PA is a multi-nitrogen straight chain amine matter and R is H or C1-C2 alkyl. The preparation method of the absorbent is characterized in that t the multi-nitrogen straight chain amine matter and the short chain carboxylate 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 95% and the absorbent can be used for acidic gasses such as SO2, and the like.

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 method and absorption and desorption treatment. 2. Background technology [0002] Room temperature ionic liquids are a class of substances that can be applied and studied as liquid media or "soft" functional materials at room temperature or even below room temperature. It is liquid at less than 100°C, has low viscosity, and is completely composed of anions and cations. Generally, it has a wide liquid range, a wide solubility range, extremely low vapor pressure, good stability, adjustable acidity and alkalinity, wide electrochemical window and Unique properties such as easy recycling; the physical and chemical properties of ionic liquids can be adjusted by using different combinations of anions and cations, that is, ionic liquids have excellent designability, and ionic liquids with special ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 李学良席俊松罗梅汪华陈洁洁
Owner HEFEI UNIV OF TECH
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