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Vacuum swing adsorption for R-32 recovery from R-410A refrigerant blend.

Author(s) : RIBEIRO R. P. P. L., SOSA J. E., ARAUJO J. M. M., PEREIRO A. B.

Type of article: IJR article

Summary

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 (0.7; 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.

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Pages: 253-264

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Details

  • Original title: Vacuum swing adsorption for R-32 recovery from R-410A refrigerant blend.
  • Record ID : 30031725
  • Languages: English
  • Subject: Technology, Environment
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 150
  • Publication date: 2023/06
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2023.01.020

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