(24c) Aqueous Ethylaminoethanol Blended Solvents: Promising Candidates for CO2 Capture
AIChE Spring Meeting and Global Congress on Process Safety
Monday, April 27, 2015 - 2:30pm to 3:00pm
Excessive utilization of fossil fuels contribute to 64% of greenhouse gas emission worldwide and fossil fuel based power generation currently accounts for over one third of global annual CO2 emissions. The concentration of CO2 in environment has reached upto 392 ppm (by volume) as of 2011, which was 280 ppm in pre-industrial times and if this trend continues, by 2050, CO2 concentration is expected to raise upto 550 ppm. The continuous emission of CO2 is considered as one of the significant reasons for the greenhouse effect and global warming. Due to the undesirable effects of CO2 emission on the global environment, as well as the world’s immense reliance on fossil fuels, development of tactics for the reduction of CO2 discharge has become increasingly important. Reactive absorption of CO2 from process gas streams and flue gas from various sources by using reactive solvents such as aqueous amines is considered as the most mature CO2 capture technique with maximum efficiency and lower complexity. In this study, we propose the utilization of blended solvents (mainly consists of ethylaminoethanol added with other physical/chemical solvents) as promising candidates for the reactive absorption of CO2. The stability of the derived solvents in terms of thermal and oxidative degradation in presence of CO2 and O2 was studied at different experimental conditions by performing accelerated degradation experiments using a high-temperature high-pressure subcritical reactor and the samples obtained after performing the degradation reactions were analyzed via gas chromatography (GC). Also, kinetics of absorption of CO2 in derived solvents was also investigated in detail by using stirred cell reactor. A novel fall in pressure technique was employed for the absorption study and fall in the CO2 pressure during the absorption experiments was determined by using pressure transducer coupled with a data acquisition system. The experimental set-ups and procedures and results obtained during this investigation will be presented in detail.
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