Experimental Modeling of CO 2 Sorption/Desorption Cycle with MDEA/PZ Blend: Kinetics and Regeneration Temperature

Quentin Wehrung (), Enrico Destefanis, Caterina Caviglia, Davide Bernasconi, Linda Pastero, Marco Bruno, Andrea Bernasconi, Alex Magnetti Vernai, Alice Di Rienzo and Alessandro Pavese
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Quentin Wehrung: Earth Science Department, University of Turin, Via Valperga Caluso, 35, 10125 Torino, Italy
Enrico Destefanis: Earth Science Department, University of Turin, Via Valperga Caluso, 35, 10125 Torino, Italy
Caterina Caviglia: Earth Science Department, University of Turin, Via Valperga Caluso, 35, 10125 Torino, Italy
Davide Bernasconi: Earth Science Department, University of Turin, Via Valperga Caluso, 35, 10125 Torino, Italy
Linda Pastero: Earth Science Department, University of Turin, Via Valperga Caluso, 35, 10125 Torino, Italy
Marco Bruno: Earth Science Department, University of Turin, Via Valperga Caluso, 35, 10125 Torino, Italy
Andrea Bernasconi: Earth Science Department, University of Turin, Via Valperga Caluso, 35, 10125 Torino, Italy
Alex Magnetti Vernai: Ecospray Technologies Srl, Via Circonvallazione, 14/14A, 15050 Alzano Scrivia, Italy
Alice Di Rienzo: Ecospray Technologies Srl, Via Circonvallazione, 14/14A, 15050 Alzano Scrivia, Italy
Alessandro Pavese: Earth Science Department, University of Turin, Via Valperga Caluso, 35, 10125 Torino, Italy

Sustainability, 2023, vol. 15, issue 13, 1-13

Abstract: CO 2 sorption–desorption cycles with a methyldiethanolamine (MDEA)/piperazine (PZ) blend have been performed with a rotoevaporator. Similar to other CO 2 separation technologies, the heating involved in MDEA/PZ solvent regeneration is the most energy-intensive step in the overall CO 2 separation process. Thus, this study investigated the desorption kinetics under low-pressure (<200 mbar) and low-temperature conditions in the range from 308 to 363 K with the aim of reducing costs. The CO 2 desorption time to unload the samples from ~2.35 mol/kg to below the threshold of 1 mol/kg was reduced from 500 s at 333 K to 90 s at 363 K. The Avrami–Erofoyev model was found to fit the experimental kinetic data accurately. The Arrhenius law calculations provided an activation energy of the CO 2 desorption process equal to 76.39 kJ/mol. It was demonstrated that the combination of a pressure reduction and the increase in temperature resulted in an enhancement of the desorption kinetics, especially at low temperatures. The combined effect of these two factors resulted in higher desorption kinetics compared to the individual effects of either factor alone. Solvent regeneration at a low temperature was demonstrated to be a valid option when coupled with pressure reduction.

Keywords: amine blend; CO 2 capture; solvent regeneration; vacuum system; roto-evaporator (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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