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Methods and systems for deacidizing gaseous mixtures

A technology for degassing and acid gas, used in separation methods, gas treatment, carbon compounds, etc.

Inactive Publication Date: 2011-09-14
胡亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, typical gas-liquid absorption processes are limited to the use of absorbents in the form of a single liquid phase

Method used

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  • Methods and systems for deacidizing gaseous mixtures
  • Methods and systems for deacidizing gaseous mixtures
  • Methods and systems for deacidizing gaseous mixtures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The absorbent contains 2 phases, an organic phase and a carrier phase, and the mixed gas containing carbon dioxide is fed into a stirred absorption unit at 25°C to 45°C at atmospheric pressure. The organic phase is composed of 20% monoethanolamine by volume and 80% decanol by volume, and the carrier phase is composed of the reaction product of ethanolamine and carbon dioxide.

[0067] When the organic phase comes into contact with the gas mixture, carbon dioxide is chemically absorbed by the organic phase by reacting with ethanolamine in the organic phase. The absorbed carbon dioxide exists as a reaction product with ethanolamine. The reaction products are transferred to the carrier phase through the interface between the organic phase and the carrier phase, where they accumulate. After absorbing the carbon dioxide gas, the absorbent is identified and separated by gravity into a first acid-lean gas phase and an acid-rich gas phase. The first acid-lean gas phase, consi...

Embodiment 2

[0069] An absorbent consists of an organic phase, a carrier phase, and two liquid phases. The carbon dioxide-containing gas mixture is supplied to a stirred absorption unit at 25°C to 45°C at atmospheric pressure. The organic phase consists of 20% dibutylamine and 80% isooctyl alcohol by volume. The carrier phase contained 150 g / l of potassium carbonate in water.

[0070] When the organic and mixed gas phases come into contact, carbon dioxide is chemically absorbed by the organic phase through the reaction with dibutylamine in the organic phase. The absorbed carbon dioxide exists as the reaction product of carbon dioxide and dibutylamine. The reaction product is further reacted with potassium carbonate in the carrier phase to form potassium bicarbonate, so that it is transferred to the carrier phase through the interface between the organic phase and the carrier phase. Thus, the absorbed carbon dioxide ends up in the carrier phase as (in the form of) potassium bicarbonate. ...

Embodiment 3

[0075] The absorbent includes two liquid phases, an organic phase and a carrier phase, and a mixed gas containing carbon dioxide is supplied to a stirring absorption unit at 25°C to 45°C under one atmospheric pressure. The organic phase consists of 20% dibutylamine and 80% isooctyl alcohol by volume. The carrier phase is an aqueous solution.

[0076] When the organic phase is in contact with the mixed gas phase, carbon dioxide is chemically absorbed by the organic phase by reacting with dibutylamine in the organic phase. Absorbed carbon dioxide exists as the reaction product of carbon dioxide and dibutylamine. The reaction product then transfers to the carrier phase through the interface between the organic phase and the carrier phase and accumulates there.

[0077] The absorbent is defined after absorbing carbon dioxide gas and separated by gravity into a first acid-lean gas phase and an acid-rich gas phase. The first acid-lean gas phase contains unreacted dibutylamine, is...

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Abstract

The invention provides a process for deacidizing a gaseous mixture. The method comprises absorbent is used to contact with the gaseous mixture in an absorbing unit, and the absorbent contains organic phase and load phase which do not mix with each other; the organic phase absorbs acid gas and transforms the acid gas into the absorptive acid gas so as to transform the absorbent into rich acid gas absorbent and transform the gaseous mixture into purified gaseous mixture; the absorbed acid gas is delivered to the load phase so that first poor acid gas phase and rich acid gas phase are formed in the rich acid gas absorbent to provide the rich acid gas phase to a separating unit to separate the first poor acid gas phase and rich acid gas phase; the separated first poor acid gas phase is recycled into the absorbing unit; the separated rich acid gas phase is provided to a regenerating unit to gain acid gas and second poor acid gas phase; and the second poor acid gas phase is recycled into the absorbing unit. The deacidizing process, compared with the prior art, decreases energy consumption to the minimum and increases the absorbing efficiency to the maximum.

Description

technical field [0001] The present invention relates to a process for deacidifying gas mixtures using phase enhanced gas-liquid absorption. More particularly, the present invention relates to a process for deacidification of gas mixtures using phase enhanced gas-liquid absorption which increases the rate of absorption of acid gases in the gas mixture while reducing the overall energy consumption of this deacidification operation. Background technique [0002] Deacidification is necessary before raw natural gas or gas mixtures (gas mixtures) containing appreciable amounts of sour gases (such as hydrogen sulfide, carbon dioxide, or similar pollutants) can be utilized. The deacidification process reduces acid gas impurities in the gas mixture to acceptable levels. This process is usually accomplished through an amine gas treatment process. Amines are commonly used in gas treatment processes in various industrial settings such as refineries, natural gas processing plants, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C01B32/50
CPCB01D2257/306B01D2257/308B01D53/1493B01D53/62B01D2257/304B01D2252/20405B01D53/1418B01D2252/504B01D2257/504B01D2252/20421B01D2257/302Y02C10/06B01D2257/2045B01D2252/20484B01D53/1475B01D2251/606B01D2251/306Y02C20/40B01D53/14B01D53/34
Inventor 胡亮
Owner 胡亮
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