Study on CO2 Absorption and Regeneration Property of Flue Gas From Methyldiethanolamine-Amine Mixture System

doi:10.12096/j.2096-4528.pgt.23108

Abstract

Abstract:

Objectives The absorption and regeneration properties of different formulations of methyldiethanolamine (MDEA) mixed with different diamines were studied. Methods In the simulated flue gas environment with 12% CO₂ and 88% N₂, MDEA was used as the main agent, while ethylenediamine (EDA), 1,3-diaminopropane (DAP), N-methyl-1,3-propanediamine (MAPA), aminoethylethano-lamine (AEEA), N,N-dimethylethylenediamine (DMEDA) and 3-dimethylaminopropylamine (DMPDA) were added as activators, respectively. Under a total amine concentration of 40%, the chemical absorbent was configured with mass ratios of main agent to activator of 1∶1, 2∶1 and 3∶1, respectively. The absorption rate, regeneration rate and circulation capacity of different absorbers were determined by comparing bubble absorption and oil bath regeneration experiments. Results MDEA-EDA system has the best absorption property when the mass ratio of MDEA to EDA is 1∶1. The MDEA-DMEDA system has the best regeneration property when the mass ratio of MDEA to DMEDA is 2∶1, with a circulation capacity reaching 1.7 mol/kg. The overall properties of MDEA-AEEA system are optimized when the mass ratio of MDEA to AEEA is 1∶1, with a cycle capacity reaching 1.49 mol/kg. Conclusions The research results can provide a theoretical basis for the formulation optimization of mixed amine solutions in industry.

Key words: carbon capture, utilization and storage (CCUS), absorption property, regeneration property, methyldiethanolamine (MDEA), diamine

CLC Number:

TK 09

Yuhang SUN, Chao LI, Zhengrong WANG, Luchang SUN, Kailiang WANG, Ximing HU, Mengxiang FANG, Feng ZHANG. Study on CO₂ Absorption and Regeneration Property of Flue Gas From Methyldiethanolamine-Amine Mixture System[J]. Power Generation Technology, 2024, 45(3): 468-477.

Figures/Tables 10

Tab. 1 Chemical reagents involved in the experiment

化学试剂	英文名称	分子结构
甲基二乙醇胺	MDEA
乙二胺	EDA
1,3-丙二胺	DAP
3-甲氨基丙胺	MAPA
羟乙基乙二胺	AEEA
N,N-二甲基乙二胺	DMEDA
N,N-二甲基-1,3-丙二胺	DMPDA

Fig. 1 Absorption experimental device diagram

Fig. 2 Regeneration experimental device diagram

Fig. 3 Reaction kinetics characteristics of MDEA-EDA system

Fig. 4 Reaction kinetics characteristics of MDEA-DAP system

Fig. 5 Reaction kinetics characteristics of MDEA-MAPA system

Fig. 6 Reaction kinetics characteristics of MDEA-AEEA system

Fig. 7 Reaction kinetics characteristics of MDEA-DMEDA system

Fig. 8 Reaction kinetics characteristics of MDEA-DMPDA system

Fig. 9 Optimal formulation reaction kinetics characteristics of each system

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Study on CO₂ Absorption and Regeneration Property of Flue Gas From Methyldiethanolamine-Amine Mixture System

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