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Cycle à adsorption oscillatoire sous vide pour la récupération du R-32 à partir d'un mélange de frigorigènes R-410A
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Orientador(es)
Resumo(s)
The recovery of high purity fluorinated gases from refrigerant blends is vital to promote a circular economy in the field of refrigeration and air conditioning. In this work, we evaluate the performance of a four-step Vacuum Swing Adsorption (VSA) process using activated carbon for the recovery of R-32 (difluoromethane) from a R-410A refrigerant blend: a binary mixture of R-125 (pentafluoroethane) and R-32 (yR−32=0.7; yR−125=0.3). Breakthrough curves were performed using dilute and bulk feed concentrations to determine mass and heat transfer parameters, which were then employed in simulations of fixed-bed adsorber dynamics. The mathematical model employed successfully predicts the experimental results of a four-step VSA cycle (feed, blowdown, purge, pressurization). The VSA performance was evaluated using process simulation. For a cycle time of 800 s (each step taking 200 s) and feed and regeneration pressures of 1.01 and 0.01 bar, respectively, R-32 is obtained with 97.0 mol-% purity and 30.9% recovery, with process productivity of 4.06 mol h−1 per kilogram of adsorbent, and energy consumption of 123.2 kJ/mol. Our results demonstrate the feasibility of using VSA processes for the recovery of R-32 from the near-azeotropic R-410A refrigerant blend.
Descrição
The authors acknowledge the financial support from the LIFE-4-Fgases project [ LIFE20 CCM/ES/001748 ] funded by EU LIFE Programme .
Norma Transitória DL 57/2016 Program Contract (R.P.P.L.R.).
Publisher Copyright:
© 2023 The Author(s)
Palavras-chave
Activated carbon Fluorinated gases Greenhouse gases Recycling VSA Building and Construction Mechanical Engineering SDG 7 - Affordable and Clean Energy SDG 8 - Decent Work and Economic Growth SDG 12 - Responsible Consumption and Production