| Title |
Vacuum swing adsorption for R-32 recovery from R-410A refrigerant blend |
| ID_Doc |
9776 |
| Authors |
Ribeiro, RPPL; Sosa, JE; Araújo, JMM; Pereiro, AB; Mota, JPB |
| Title |
Vacuum swing adsorption for R-32 recovery from R-410A refrigerant blend |
| Year |
2023 |
| Published |
|
| DOI |
10.1016/j.ijrefrig.2023.01.020 |
| Abstract |
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 R410A 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. |
| Author Keywords |
Greenhouse gases; Fluorinated gases; Recycling; VSA; Activated carbon |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001080425800001 |
| WoS Category |
Thermodynamics; Engineering, Mechanical |
| Research Area |
Thermodynamics; Engineering |
| PDF |
https://doi.org/10.1016/j.ijrefrig.2023.01.020
|