Abstract
Ethanol solutions of diamine, ethylenediamine (EDA) or piperazine (PZ), were found to be able to produce a solid precipitate after the absorption of CO2. The precipitate was identified to be a mixture of monocarbamate and dicarbamate. The details of the reactions between CO2 and diamine were examined. Results show that EDA-ethanol solutions exhibit higher capacity and faster rate for CO2 absorption than PZ-ethanol solutions. As a comparison, the kinetics of CO2 absorption with diamine-water solutions were also tested. It was found that the overall average absorption rate of CO2 in EDA-ethanol solutions is almost double that in EDA-water solutions. Moreover, results show that EDA-carbamate has a decomposition temperature of ∼90°C and requires a regeneration energy of 25.6% less than traditional monoethanolamine (MEA) solutions, which suggests that EDA-ethanol solutions are promising to be used as cost-effective absorbents for CO2 capture.
Original language | English |
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Pages (from-to) | 6298-6304 |
Number of pages | 7 |
Journal | Energy and Fuels |
Volume | 31 |
Issue number | 6 |
DOIs | |
State | Published - 15 Jun 2017 |
Externally published | Yes |