Correlation of Plasticization Pressure Versus Permeability Parameters at Plasticization for Polymeric Membranes Used for CO2 Removal from Natural Gas

Semi-empirical model was developed to provide a relationship between the plasticization pressure and permeabilities of polymeric membranes used for high pressure CO₂ removal from natural gas. A theoretical model was first derived based on the solution – diffusion mechanism. The model derived was then used to perform a multiple regression using permeability and plasticization pressure data from literature. Fair agreement between the model predictions and the experimental values were realized by introducing two model parameters ( κ₁ and κ₂ ). The values of these parameters are 0.20 and 0.60 respectively. The predicted values of permeability compare favorably well with the experimental values with absolute errors ranging from 0.30 to 35.66%. The coefficient of determination was obtained as 0.987.