394471 Reactive Absorption of CO2 from Industrial Flue Gas Using Aqueous Solution Containing Renewable Prepared Amine

Monday, November 17, 2014
Galleria Exhibit Hall (Hilton Atlanta)
Shahd Gharbia1, Mehak Jilani1, Jamila Folady1, Dareen Dardor1, LJP van den Broeke1, Anand Kumar1, Vijaykumar Mahajani2 and Rahul Bhosale1, (1)Department of Chemical Engineering, Qatar University, Doha, Qatar, (2)Institute of Chemical Technology, Mumbai, India

Flue gas from coal-fired power plants, cement manufacturing, refineries, etc., is considered as one of the major sources of CO2 emissions which contribute to the increasing greenhouse effect. Because of this adverse effect of CO2 discharge on the global environment, as well as the world’s immense dependence on fossil fuels, the development of strategies for the reduction of CO2 emissions has become increasingly important. With this viewpoint, considerable efforts are underway towards the development of CO2 capture technologies. Due to its higher efficiency and lower complexity, amine based closed loop chemical absorption/desorption technology (CADT) is preferred industrially as an effective gas sweetening process for separation of CO2 from flue gas. In this investigation, solvent-1: aqueous solution of renewably prepared ethylaminoethanol (EAE), solvent-2: aqueous blend of EAE and N-methyl-2-pyrolidone (NMP), and solvent-3: aqueous blend of EAE, NMP, and hydroxyl radical scavengers were investigated towards reactive absorption of CO2 from industrial flue gas. Degradation of all the above mentioned solvents in presence of O2 and CO2 was studied at different experimental conditions by using a high-temperature high-pressure subcritical reactor and the samples obtained after performing the degradation reactions were analyzed via gas chromatography (GC). Furthermore, kinetics of reactive absorption of CO2 in solvent-1, solvent-2, and solvent-3 was also investigated in detail by using stirred cell reactor. A 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. Effects of various process parameters such as stirring speed, amine concentration, and reaction temperature on absorption kinetics were examined in detail. The results obtained indicate that solvent-1, solvent-2, and solvent-3 possess relatively high solvent stability and CO2 absorption capacity with faster absorption kinetics as compared to previously investigated amine based solvent systems. The experimental set-up/procedures and results obtained during this investigation will be presented in detail.

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