(104a) CO2 Capture Using Aqueous Ethylaminoethanol: Study of Oxidative Degradation

Authors: 
Folady, J., Qatar University
Gharbia, S., Qatar University
Yousefi, S., Gas Processing Center
Jilani, M., Qatar University
Hussein Ali, M., Qatar University
Angre, P., Mumbai University
AlMomani, F. A., Qatar University

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. In carbon sequestration science, the separation and capture of CO2 is considered as one of the highest priorities as the capture cost is expected to be up to 75% of the total costs for geological and oceanic sequestration. Due to its higher efficiency and lower complexity, reactive absorption of CO2 from flue gas containing 70-75% N2, 10-15% CO2, 4-5% H2O, and 3-10% O2 by aqueous amines is considered as the most mature post combustion CO2 capture technology. It is a two-step process in which the first step corresponds to the reactive absorption of CO2 from flue gas using an amine based chemical solvent and the second step deals with the stripping of CO2 from this solvent for storage or for other use. Although the CO2-amine reactions are reversible in nature, irreversible reactions may also occur resulting in products from which the amines are not easily recovered. This phenomenon is referred to as degradation of amines which can pose several limitations to the CO2 absorption/stripping process.

In our recent studies, we realized the renewably prepared ethylaminoethanol (EAE) represents a promising solvent for the reactive absorption of CO2. The % thermal reduction of this solvent is lower and the CO2 absorption capacity is higher as compared to other previously investigated amine based solvents. In this contribution, oxidative degradation of aqueous EAE was examined 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). Reaction kinetics of the oxidative degradation of aqueous EAE was also studied by investigating the influence of various process parameters and a power law model was fitted to the obtained kinetic data. In addition to the experimental investigation, a multiple regression analysis was performed to estimate the kinetic parameters for oxidative degradation of aqueous EAE. Obtained results will be presented in detail.

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