Method for inhibiting degradation of decarburization amine absorbent

An absorbent and decarburized amine technology, which is applied in the direction of absorption, separation methods, chemical instruments and methods, etc., to achieve the effects of ensuring stability, less addition, and significant antioxidant properties

Active Publication Date: 2013-04-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above inventions all have a certain inhibitory effect on the degradation of alcohol amines, but they still cannot fundamentally solve the problem of oxidative degradation of alcohol amines, and there is still room for improvement in the antioxidant effect

Method used

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  • Method for inhibiting degradation of decarburization amine absorbent
  • Method for inhibiting degradation of decarburization amine absorbent
  • Method for inhibiting degradation of decarburization amine absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Select the ethanolamine aqueous solution of 5mol / l (massfraction about 30%), add two kinds of typical antioxidant threitol (C 4 h 10 o 4 ) and 2-thiothreitol (C 4 h 10 o 2 S 2 ) in a reactor with a reaction temperature of 120°C and an oxygen partial pressure of 0.25Mpa for a 120h enhanced degradation test, and the common antioxidant sodium sulfite (Na 2 SO 3 ) and sodium molybdate (Na 2 MoO 4 ) for comparison, and the degradation rate of ethanolamine (MEA) was used as an index to evaluate the antioxidant effect. The experimental results are shown in Table 1. It can be seen from Table 1 that the antioxidant effects of 2-thiothreitol and threitol increased by 58.3% and 105.8% respectively compared with sodium sulfite, and increased by 18.0% and 53.4% ​​respectively compared with sodium molybdate. Sodium dithionite (Na 2 S 2 o 4 ) and sodium thiosulfate (Na 2 S 2 o 3 ) has almost no antioxidant effect.

[0020] Table 1. Antioxidant test results of different...

Embodiment 2

[0025] Select the ethanolamine aqueous solution of 5mol / l, add two kinds of typical antioxidant threitol (C 4 h 10 o 4 ) and 2-thiothreitol (C 4 h 10 o 2 S 2 ) in a reaction kettle with a reaction temperature of 55°C and an oxygen partial pressure of 0.1Mpa to perform a 500h enhanced degradation test, the results are shown in Table 2. It can be seen from Table 2 that the antioxidant effects of threitol and 2-thiothreitol are respectively increased by 94.1% and 114.5% compared with sodium sulfite.

[0026] Table 2. Antioxidant test results of different additives

[0027]

Embodiment 3

[0029] Select the ethanolamine aqueous solution of 11mol / l (massfraction about 70%), add two kinds of typical antioxidant threitol (C 4 h 10 o 4 ) and 2-thiothreitol (C 4 h 10 o 2 S 2 ) in a reaction kettle with a reaction temperature of 150°C and an oxygen partial pressure of 0.35Mpa to perform a 100h enhanced degradation test. The experimental results are shown in Table 3. It can be seen from Table 3 that the antioxidant effects of threitol and 2-thiothreitol are respectively increased by 45.1% and 55.2% compared with sodium sulfite.

[0030] Table 3. Antioxidant test results of different additives

[0031]

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PUM

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Abstract

The invention relates to a method for inhibiting degradation of a decarburization amine absorbent. Specifically, certain amount of antioxidant is added into the amine absorbent to inhibit degradation of the amine absorbent. The used antioxidant can be xylitol, threitol, dithiothreitol, erythritol, ethylene glycol, butanediol and other structurally similar alcohol compounds. By means of the principles of interrupting an oxidation reaction chain and decomposing an oxidative degradation product, the antioxidant can achieve significant antioxidant effects, and can be used under the circumstances of small adding amount, high temperature and wide oxygen content, thus greatly inhibiting degradation of amine water solution. Stability of a recovery solvent and continuous operation of separation equipment are ensured, the degree of corrosion caused by an absorption solvent on equipment can be reduced, and meanwhile the absorbent loss is also reduced. The method can be used for antioxidation of amine absorption solvents applied in capture and separation of carbon dioxide (CO2) from natural gas, shift gas, synthetic gas, flue gas and other industrial feed gas.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and in particular relates to an antioxidant for inhibiting the oxidative degradation of organic amine solvents. Background technique [0002] Capture and separation of carbon dioxide (CO2) from gases such as natural gas, shift gas, synthesis gas and flue gas 2 ) is of great significance to the efficient utilization of industrial raw material gas and the mitigation of the greenhouse effect. The current industrial capture of CO 2 The methods mainly include adsorption method, membrane separation method, low temperature separation method and absorption method, etc., the most widely used is solvent absorption separation method. Among them, the alcohol amine method has the advantages of high absorption efficiency, mature technology, and simple process. At the same time, this method also has the disadvantages of easily causing the degradation of alcohol amine, corroding equipment, and high rege...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/62B01D53/78C10K1/14C10L3/10C07C213/10C07C215/08
CPCY02C10/04Y02C10/06Y02C20/40Y02P20/151
Inventor 张香平赵志军董海峰曹领帝高红帅曾少娟高巨宝张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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