REACTION KINETICS OF CARBON DIOXIDE WITH NONAQUEOUS SOLUTIONS OF STERICALLY HINDERED AMINES

Authors : Fatma Pınar Gördesli Duatepe, Erdoğan Alper

Pages : 91-102

View : 10 | Download : 7

Publication Date : 2017-02-23

Article Type : Other Papers

Abstract :Due to existing energy intensive CO 2 capture processes and rising fuel costs, alternative and affordable solvents or technologies for CO 2 capture have gained importance in the research of reducing global warming. To that effect, sterically hindered amines have been introduced which have high CO 2 absorption capacities by means of the formation of unstable carbamate ions. Another factor leading to an affordable solvent for CO 2 capture could be using nonaqueous solvents instead of aqueous solvents in the process. This is important because nonaqueous solvents can eliminate some of the problems of aqueous solvents such as corrosion and high heat requirements. To that end, in this study we investigated the reaction kinetics of CO 2 and two sterically hindered amines; 2-amino-2-methyl-1,3-propanediol insert ignore into journalissuearticles values(AMPD); and 2-amino-2-ethyl-1,3-propanediol  insert ignore into journalissuearticles values(AEPD); in ethanol. The pseudo–first-order reaction rate constants of the reactions between CO 2 and sterically hindered amines were measured in ethanol at 288, 298 ve 308K by using direct stopped-flow technique. The measured rate constants were then analyzed by using the equations of termolecular reaction mechanism. The orders of the reactions insert ignore into journalissuearticles values( n ); between CO 2 -AMPD and CO 2 -AEPD were found as 1 and 2, respectively. To our best knowledge, our study is the first in the literature showing that ethanol can be involved in a termolecular reaction just as the partaking of water in the reaction.  
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