Development of an efficient 3AP-DMEA-butanol-water phase change absorbent for CO_2 capture

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Development of an efficient 3AP-DMEA-butanol-water phase change absorbent for CO_2 capture

Journal Title: Energy Environmental Protection - Year 2024, Vol 38, Issue 3

Abstract

Controlling CO_2 emissions from low-concentration sources like coal-fired power plants and steel mills is crucial for achieving "carbon neutrality" . Amine-based CO_2 capture technology is a leading contender for industrial application. This study aims to overcome limitations in energy consumption associated with amine-based processes by developing an efficient phase-separating CO_2 absorbent. The structural effects of primary and secondary amines on the phase separation characteristics of amine-n-butanol-water absorbents after CO_2 absorption were investigated. The role of tertiary amines in the absorption-desorption and phase separation performance of 3AP-NBA-H_2O was also studied. Experimental results showed that the 3-aminopropanol (3AP)-n-butanol (NBA)-water absorbent had certain advantages in terms of rich CO_2 phase viscosity, amine distribution, volume, and phase transition critical point, indicating good phase separation characteristics. The addition of tertiary amines significantly reduced the viscosity of the rich CO_2 phase while increasing the CO_2 cycling capacity and desorption rate per unit volume of the solution. The novel 20%3AP-10%N,N-dimethylethanolamine(DMEA)-40%NBA-30%H_2O phase-separating absorbent had a rich phase volume of 61.2% and a viscosity of only 6.73 mPa·s. The proportion of amine in the rich phase was 91.2%, with desorption rate and CO_2 cycling capacity reaching 72.00% and 1.42 mol·L^-1, respectively. Compared to the absorbent with 30%3AP-40%NBA-30%H_2O, the desorption rate and CO_2 cycling capacity were improved by 88.6% and 86.8%, respectively, while showing an improvement of 46.8% and 13.6% compared to a 30% monoethanolamine (MEA) solution.

Authors and Affiliations

HONG Shumin|Joint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, China, HU Xing|Joint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, China, ZHENG Zhuangzhuang|Joint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, China, XIAO Min|Joint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, China, GAO Hongxia*|Joint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, China, LIANG Zhiwu|Joint International Center for CO2 Capture and Storage (iCCS), Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing CO2 Emissions, College of Chemistry and Chemical Engineering, Hunan University, China,

Keywords

Optimization of the synthesis conditions of zeolite adsorbents derived from coal fly ash and study on their adsorption performance on benzene

Zeolite adsorbents were synthesized through an alkali fusion-hydrothermal process, using coal fly ash as a raw material. Firstly, the coal fly ash was mixed with sodium hydroxide at a mass ratio of 1â¶1.2 and then roast...

EP ID EP737926
DOI 10.20078/j.eep.20240402
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