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Absorbent which gathers carbon dioxide in flue gas or synthesis gas

A carbon dioxide and absorbent technology, which is applied in reagents, chemical instruments and methods, and separation of dispersed particles, can solve the problems of strong corrosion of equipment, easy degradation of absorbents, and high regeneration energy consumption, so as to reduce operating costs and reduce solvent loss , The effect of low regeneration energy consumption

Inactive Publication Date: 2013-03-27
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 1970s, BASF of Germany added N-methyldiethanolamine (MDEA) to monoethanolamine (MEA) to develop a solution with relatively good absorption and desorption properties, but did not solve the regeneration energy consumption High and amine degradation and strong corrosion to equipment
This type of absorbent with N-methyldiethanolamine (MDEA) or monoethanolamine (MEA) as the main component has high energy consumption when it is used to capture carbon dioxide in low partial pressure gases such as flue gas or syngas. , Absorbents are easy to degrade and other disadvantages

Method used

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  • Absorbent which gathers carbon dioxide in flue gas or synthesis gas
  • Absorbent which gathers carbon dioxide in flue gas or synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 20g of 2-(methylamino)ethanol (NMEA), 8.33g of N-methyldiethanolamine (MDEA), 1.67g of piperazine (PZ), and 70g of water to make a 30% mixed absorbent, of which 2-(methyl Amino) ethanol accounts for 20wt%, N-methyldiethanolamine accounts for 8.33%, piperazine accounts for 1.67%, and water accounts for 70wt%.

[0027] The mixed gas flow rate is 2L / min, and the composition is 15vt%CO 2 and 85vt%N 2 . The mixed gas is passed into the above mixed absorbent at normal pressure and 40°C for absorption. After the gas-liquid two phases reach equilibrium, the absorbed liquid is placed at 120°C and the back pressure is 0.1MPa for regeneration. Its volume absorption capacity and net absorption capacity are shown in Table 3:

[0028] Table 1 2-(methylamino)ethanol 20wt% + N-methyldiethanolamine 8.33wt% + piperazine 1.67wt%

[0029]

Embodiment 2

[0031] Take 15g of 2-(methylamino)ethanol (NMEA), 12.5g of N-methyldiethanolamine (MDEA), 2.5g of piperazine (PZ), and 70g of water to make a 30% mixed absorbent, of which 2-(methyl Amino) ethanol accounts for 15wt%, N-methyldiethanolamine accounts for 12.5%, piperazine accounts for 2.5%, and water accounts for 70%.

[0032] The mixed gas flow rate is 2L / min, and the composition is 15vt%CO 2 and 85vt%N 2 . The mixed gas is passed into the above mixed absorbent at normal pressure and 40°C for absorption. After the gas-liquid two phases reach equilibrium, the absorbed liquid is placed at 120°C and the back pressure is 0.1MPa for regeneration. Its volume absorption capacity and net absorption capacity are shown in Table 1:

[0033] Table 2 2-(methylamino)ethanol 15wt% + N-methyldiethanolamine 12.5wt% + piperazine 2.5wt%

[0034]

Embodiment 3

[0036] Take 15g of monoethanolamine (MEA), 5g of 2-(methylamino)ethanol (NMEA), 5g of N-methyldiethanolamine (MDEA), 5g of diethanolamine (DEA), and 70g of water to prepare a 30% mixed absorbent, of which Monoethanolamine accounts for 15 wt%, 2-(methylamino)ethanol accounts for 5 wt%, N-methyldiethanolamine accounts for 5 wt%, diethanolamine accounts for 5 wt%, and water accounts for 70 wt%.

[0037] The mixed gas flow rate is 2L / min, and the composition is 15vt%CO 2 and 85vt%N 2 . The mixed gas is passed into the above mixed absorbent at normal pressure and 40°C for absorption. After the gas-liquid two phases reach equilibrium, the absorbed liquid is placed at 120°C and the back pressure is 0.1MPa for regeneration. Its volume absorption capacity and net absorption capacity are shown in Table 3:

[0038]Table 3 30% monoethanolamine 15wt% + 2-(methylamino) ethanol 5wt% + N-methyldiethanolamine 5wt% + diethanolamine 5wt%

[0039]

[0040] From Example 1 and Example 2, it ...

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Abstract

The invention discloses an absorbent which gathers carbon dioxide in flue gas or synthesis gas, comprising the following components by weight percentage: 5-25wt% of 2- methylamino (ethanol), 5-25wt% of primary amine, secondary amine or tertiary amine and 60-90% of water. As the 2- methylamino (ethanol) is a secondary amine which has a higher boiling point compared than other secondary amine, the degradation loss of solvent is less. The absorbent of the invention can be used for gathering various normal-pressure gas mixture, such as carbon dioxide in flue gas or synthesis gas discharged by the enterprises of coal-fired power plants, petrochemical industry and the like. The absorbent has large absorbing volume for carbon dioxide at low partial pressure, the regeneration effect is good and the energy consumption for unit carbon dioxide gathering amount is low.

Description

technical field [0001] The invention relates to the technical field of gas absorption and separation engineering, in particular to an absorbent for capturing carbon dioxide in flue gas or synthesis gas. Background technique [0002] CO 2 It is one of the greenhouse gases and is the main factor causing the global greenhouse effect and climate change. CO 2 Capture technology is one of the effective ways to alleviate the greenhouse effect and cope with climate change recognized worldwide. Capture CO from mixed gases 2 It is one of the very important methods. These mixed gases include flue gas and synthetic gas discharged from coal-fired power plants, oil refineries, chemical plants and other enterprises. These mixed gases generally contain 3% to 55% CO 2 , other gas components vary according to the process, mainly N 2 , CO 2 , O 2 , CO, H 2 、CH 4 , SO 2 、H 2 S et al. [0003] Chemical absorption method is suitable for flue gas CO 2 The situation where the partial p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/62
CPCY02P20/152Y02P20/151
Inventor 蔡铭郜时旺许世森王金意李生金
Owner HUANENG CLEAN ENERGY RES INST
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