Amine volatility in CO2 capture |
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| Authors: | Thu Nguyen Marcus Hilliard Gary T Rochelle |
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| Institution: | 1. Department of Chemical Engineering, The University of Texas at Austin, United States;2. The Dow Chemical Company, United States;1. University of Florence, Department of Chemistry, via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italy;2. ICCOM CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy;1. Greenhouse Gas Department, Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea;2. Materials Development Center, Hyundai Motor Group, 772-1, Jangduk-dong, Hwaseong-Si, Gyeonggi-Do 445-706, Republic of Korea |
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| Abstract: | Amine volatility is a key screening criterion for amines to be used in CO2 capture. Excessive volatility may result in significant economic losses and environmental impact. It also dictates the capital cost of the water wash. This paper reports measured amine volatility in 7 m MEA (monoethanolamine), 8 m PZ (piperazine), 7 m MDEA (n-methyldiethanolamine)/2 m PZ (piperazine), 12 m EDA (ethylenediamine), and 5 m AMP (2-amino-2-methyl-1-propanol) at 40–60 °C with lean and rich loadings giving CO2 partial pressures of 0.5 and 5 kPa at 40 °C. The amine concentrations were chosen to maximize CO2 capture capacity at acceptable viscosity. At the lean loading condition (where volatility is of greatest interest), the amines are ranked in order of increasing volatility: 7 m MDEA/2 m PZ (6/2 ppm), 8 m PZ (8 ppm), 12 m EDA (9 ppm), 7 m MEA (31 ppm), and 5 m AMP (112 ppm). The apparent amine partial molar excess enthalpies in these systems were estimated to range from ～10 to 87 kJ/mol of amine. |
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