TY - JOUR
T1 - Process Evaluation of Fluorinated Ionic Liquids as F-Gas Absorbents
AU - Sosa, Julio E.
AU - Santiago, Rubén
AU - Hospital-Benito, Daniel
AU - Costa Gomes, Margarida
AU - Araújo, João M. M.
AU - Pereiro, Ana B.
AU - Palomar, José
N1 - Ministerio de Economia y Competitividad (MINECO) of Spain (project CTQ2017-89441-R) and Comunidad de Madrid (P2018/EMT4348).
Centro de Computacion Cientifica de la Universidad Autonoma de Madrid for computational facilities.
Associate Laboratory for Green Chemistry-LAQV, financed by national funds from FCT/MCTES (UID/QUI/50006/2019);
FCT/MCTES (Portugal) through the project PTDC/EQU-EQU/29737/2017.
M.C.G. thanks IDEX-LYON for financial support (Programme Investissements d'Avenir ANR-16-IDEX-0005).
PY - 2020/10/6
Y1 - 2020/10/6
N2 - The environmental impact of fluorinated gases (F-gases) necessitates the development of green technologies to mitigate them. Fluorinated ionic liquids (FIL/ILs) emerged as an alternative absorbent due to their unique and exceptional properties. In this work, a COSMO-based/Aspen Plus methodology was used to evaluate the performance of FIL/ILs as absorbents in the process scale of two F-gases: 1,1,1,2-tetrafluoroethane (R-134a) and difluoromethane (R-32). Results of the absorption column in equilibrium mode revealed that the behavior of FIL/ILs is similar under the same conditions, reaching higher efficiencies in the case of absorbing R-134a at a high F-gas partial pressure. Rate-based calculations in packing column demonstrated a kinetic control with highly viscous FIL/ILs, revealing higher performance differences between FIL/IL absorbents. The regeneration stage was also evaluated in near-industrial conditions. Operating conditions of the absorption column were optimized with a column of height 10 m and diameter ranging from 1.1 to 1.2 m at 10 bar total pressure, reaching 90% F gas recovery with an L/G range of 6-10. Finally, preliminary economic analysis revealed operating costs to recover 90% of F-gas of 70 $/ton (R-134a) and 130 $/ton (R-32) with the FIL/IL that revealed the best behavior, 1-ethyl-3-methylimidazolium triflate.
AB - The environmental impact of fluorinated gases (F-gases) necessitates the development of green technologies to mitigate them. Fluorinated ionic liquids (FIL/ILs) emerged as an alternative absorbent due to their unique and exceptional properties. In this work, a COSMO-based/Aspen Plus methodology was used to evaluate the performance of FIL/ILs as absorbents in the process scale of two F-gases: 1,1,1,2-tetrafluoroethane (R-134a) and difluoromethane (R-32). Results of the absorption column in equilibrium mode revealed that the behavior of FIL/ILs is similar under the same conditions, reaching higher efficiencies in the case of absorbing R-134a at a high F-gas partial pressure. Rate-based calculations in packing column demonstrated a kinetic control with highly viscous FIL/ILs, revealing higher performance differences between FIL/IL absorbents. The regeneration stage was also evaluated in near-industrial conditions. Operating conditions of the absorption column were optimized with a column of height 10 m and diameter ranging from 1.1 to 1.2 m at 10 bar total pressure, reaching 90% F gas recovery with an L/G range of 6-10. Finally, preliminary economic analysis revealed operating costs to recover 90% of F-gas of 70 $/ton (R-134a) and 130 $/ton (R-32) with the FIL/IL that revealed the best behavior, 1-ethyl-3-methylimidazolium triflate.
UR - http://www.scopus.com/inward/record.url?scp=85092682036&partnerID=8YFLogxK
U2 - 10.1021/acs.est.0c05305
DO - 10.1021/acs.est.0c05305
M3 - Article
C2 - 32822151
AN - SCOPUS:85092682036
SN - 0013-936X
VL - 54
SP - 12784
EP - 12794
JO - Environmental Science & Technology
JF - Environmental Science & Technology
IS - 19
ER -