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Deacidification process and system for gas mixtures containing acid gases

A technology of gas mixture and acid gas, which is applied in the field of deacidification process, to increase the absorption rate, reduce energy consumption, and reduce the overall effect

Inactive Publication Date: 2015-04-29
胡亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the typical gas-liquid absorption process is limited to one absorbent in one liquid phase

Method used

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  • Deacidification process and system for gas mixtures containing acid gases

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] The absorbent is composed of amine (Monoethanolamine (MEA)) with a volume ratio of 20% and water with a volume ratio of 80%. Under the condition of 25~45℃ and 1atm, the absorbent is contacted with the gas mixture containing acid gas (carbon dioxide) in the packed absorption tower. The absorbent absorbs acid gas to form a gas-rich (carbon dioxide) absorbent. Using a membrane separation method, the gas-rich absorbent flowing out of the packed tower is concentrated to form a concentrated amine phase. In the concentrated amine phase, all MEA (including untreated Chemically modified MEA and MEA and CO 2 The concentration of the reaction product) is about 80% by volume, and the water is 20%. The concentrated amine phase is separated from the remainder of the absorbent. After separation, the remainder of the absorbent contains most of the water with a small portion of MEA and absorbed CO 2 ,

[0100] The separated concentrated amine phase is transferred to a regenerator an...

Embodiment 2

[0102] This example demonstrates the absorption of CO by aqueous carbonate 2 .

[0103] An absorbent consisting of an aqueous carbonate solution. The absorbent is contacted with a gas mixture containing acid gas (carbon dioxide) in a packed absorption tower at 50°C and 1 atm. The absorbent absorbs acid gas to form a gas-rich (carbon dioxide) absorbent. Using a membrane separation method, the gas-rich absorbent flowing out of the packed tower is concentrated to form a concentrated carbonate phase. In the concentrated carbonate phase, all carbon salts (including unmodified carbonates as well as carbonates and CO 2 reaction product, bicarbonate). The concentrated carbonate phase is separated from the remainder of the absorbent. After separation, the remainder of the absorbent contains mostly water with minor portions of carbonates and bicarbonates.

[0104] The separated concentrated carbonate phase is transferred to a regenerator and treated by heating the concentrated carb...

Embodiment 3

[0106] The absorbent is composed of 30% by volume of amine (monoethanolamine or MEA+piperazine (a small amount)) and 70% by volume of solvent (isooctanol). The absorbent is contacted with a gas mixture containing acid gas (carbon dioxide) in a stirring cell absorption unit at 25-45°C and 1 atm. Monoethanolamine (MEA) within the absorbent condenses spontaneously into a concentrated amine phase containing MEA as well as MEA and CO 2 reaction product.

[0107] After absorption, the absorbent is settled by gravity to separate the concentrated amine phase from the rest of the absorbent. After separation, the remainder of the absorbent contains most of the isooctyl alcohol, perhaps some MEA and absorbed CO 2 , are recycled to the absorption unit for reuse. In the concentrated amine phase, all MEA (including unmodified MEA and MEA and CO 2 The concentration of the reaction product) is about 60-70% by volume.

[0108] The separated concentrated amine phase is transferred to a reg...

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Abstract

The invention relates to a deacidification process for gas mixtures containing acid gases. The acid gases are separated from the gas mixtures through absorption of the acid gases by the aid of an absorbent and concentration. The invention further relates to a deacidification system for the gas mixtures containing the acid gases. The system comprises an absorption unit, a concentration unit, a separation unit and a regeneration unit. With the adoption of the process and the system, the absorption rate for separation of the acid gases from the gas mixtures can be increased, and the total energy consumption of the deacidification operation can be reduced.

Description

technical field [0001] The present invention relates to an effective process for deacidification of gas mixtures, more particularly, relates to a method of using an absorbent to absorb acid gases and then concentrate them to separate acid gases from gas mixtures, said process can increase the concentration of acid gases Separation of absorption rates from gas mixtures and reduction of overall energy consumption for deacidification operations. Background technique [0002] Acid gas removal from gas mixtures is required in many production processes, e.g. deacidification of raw natural gas or other gas mixtures containing significant amounts of acid gases including hydrogen sulfide (H2S), carbon dioxide (CO2) or similar pollutants . The deacidification process reduces acid gas impurities in the gas mixture to acceptable levels. This step is usually accomplished by amine treatment processes, which are common in various types of industrial production, such as oil refineries, na...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/1425B01D53/1456B01D53/1493B01D53/40B01D53/78B01D53/96B01D2252/204B01D2252/50
Inventor 胡亮
Owner 胡亮
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