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Membrane separation of CO₂ from natural gas components is known to be more efficient at high feed gas pressure. However, one of the main challenges of high pressure operations is penetrant – induced plasticization phenomenon. An approximate model for predicting the plasticization pressure was developed using the fundamental theory of dual – mode sorption model and the total immobilization assumption of the penetrant concentration in the Langmuir sorption site. The assumption reduces the permeability – pressure relationship to system of quadratic equations whose coefficients were used to derive an expression for estimating the plasticization pressure. The resulting expression showed that, the plasticization pressure is a multivariable function of polymer properties. The support vector (SVR) algorithm was then used to correlate between the plasticization pressure, and the fractional free volume and the …