| a | Saturated adsorption amount (mol m−3) |
| A | Effective membrane area (m2) |
| b | Adsorption equilibrium constant (-) |
| C | Concentration (mol m−3) |
| D | Diffusion coefficient (m2 s−1) |
| D′ | Term including diffusion coefficient (=aDL−1) |
| J | Permeation flux (mol m−2 s−1) |
| L | Membrane thickness (m) |
| P | Partial pressure of hydrocarbon in feed side (Pa) |
| R | Gas constant (J mol−1 K−1) |
| u | Flow rate (mol s−1) |
| VF | Adsorption amount on the membrane in feed side (mol m−3) |
| VP | Adsorption amount on the membrane in permeate side (mol m−3) |
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