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Method for absorbing and separating carbon dioxide

A carbon dioxide and separation method technology, applied in the direction of chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of high regeneration energy consumption, high regeneration temperature, equipment corrosion, etc., to achieve extended service life, low reaction conditions, avoid The effect of corrosion

Inactive Publication Date: 2010-06-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristics of these two methods are: the absorption speed is fast, but due to the high regeneration temperature, it is easy to cause equipment corrosion, and the regeneration energy consumption is also large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, monoethanolamine was used as a solute and triethylene glycol as a solvent, and 1 L of a solution was prepared by mixing to obtain an absorbent, wherein the concentration of monoethanolamine was 0.1 mol / L. Then, under the condition that the temperature is 50°C and the pressure is 200kPa, the absorbent is fully contacted with the mixed gas of carbon dioxide and nitrogen in the gas-liquid mass transfer equipment for 7 minutes, wherein the total amount of the mixed gas of carbon dioxide and nitrogen is 0.5mol, and the mixed gas of carbon dioxide is The volume fraction is 5%. Finally, the obtained liquid phase product is desorbed at 50° C. and a pressure of 0.2 kPa to realize the regeneration of carbon dioxide, and at the same time recover the absorbent for recycling.

[0024] It is detected that the absorption rate of carbon dioxide is greater than 90%.

Embodiment 2

[0026] First, diethanolamine was used as a solute and diethylene glycol as a solvent, and 1 L of a solution was prepared by mixing to obtain an absorbent, wherein the concentration of diethanolamine was 1.5 mol / L. Then, under the condition that the temperature is 25°C and the pressure is 4kPa, the absorbent is fully contacted with the mixed gas of carbon dioxide and nitrogen in the gas separation equipment for 3 minutes, wherein the total amount of the mixed gas of carbon dioxide and nitrogen is 0.01mol, and the gas volume fraction of carbon dioxide is 60%. Finally, the obtained liquid phase product is desorbed at 80° C. and a pressure of 2 kPa to realize the regeneration of carbon dioxide, and at the same time recover the absorbent for recycling.

[0027] It is detected that the absorption rate of carbon dioxide is greater than 90%.

Embodiment 3

[0029] First, diethanolamine was used as a solute and triethylene glycol as a solvent, and 1 L of a solution was prepared by mixing to obtain an absorbent, wherein the concentration of diethanolamine was 2 mol / L. Then, under the condition that the temperature is 35°C and the pressure is 500kPa, the absorbent and the mixed gas of carbon dioxide and nitrogen are fully contacted in the gas separation equipment for 5 minutes, wherein the total amount of the mixed gas of carbon dioxide and nitrogen is 1mol, and the gas volume fraction of carbon dioxide is 30%. Finally, the obtained liquid phase product is desorbed at 110° C. and a pressure of 200 kPa to realize the regeneration of carbon dioxide, and at the same time recover the absorbent for recycling.

[0030] It is detected that the absorption rate of carbon dioxide is greater than 90%.

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Abstract

The invention discloses a method for absorbing and separating carbon dioxide, which comprises absorption and desorption of the carbon dioxide at certain temperature and specifically comprises the following steps: mixing alcamines compounds and ethylene glycol compounds to form solution so as to obtain an absorbent; making the absorbent contact the gas to be absorbed in gas-liquid mass transfer equipment to obtain a liquid product; and desorbing and separating the liquid product to obtain the carbon dioxide so as to realize the regeneration of the carbon dioxide. The absorbent adopted by the method can efficiently absorb the carbon dioxide, has little corrosion to the equipment, and can realize the regeneration of the carbon dioxide and the cyclic utilization of the absorbent.

Description

technical field [0001] The invention relates to a gas absorption method, in particular to a carbon dioxide absorption and separation method. Background technique [0002] The global warming effect caused by carbon dioxide emissions has attracted widespread attention from various countries, and its emission reduction has also received increasing attention. At the same time, as an important industrial resource, carbon dioxide can be used in many fields such as food processing and industrial production. Therefore, it has good practical value to realize the enrichment of carbon dioxide efficiently and economically. [0003] In recent years, the absorption of carbon dioxide has developed extremely rapidly, which can be divided into several categories such as chemical solvent method, physical solvent method, membrane separation method, and low temperature separation method. The economic costs of physical solvent methods, membrane separation methods, and cryogenic separation metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/20C01B32/50
Inventor 骆广生谭璟王凯
Owner TSINGHUA UNIV
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