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二氧化碳通过醋酸纤维素膜的渗透系数，会随气体压力的增加而增大，这种异常行为是由于二氧化碳使膜产生增塑作用的结果，渗透系数的这样一种压力相关性使得含氧化碳的混合气体的渗透行为变得更加复杂，普通的双重吸附模型不能解释这一现象．本文提出了一个新的修正双重吸附模型，它考虑了膜的增塑化，可以说明渗透系数的这种压力相关性，并为实验结果所验证．
The permeability of carbon dioxide through a cellulose acetate membrane increases with increasing gas pressure as a result of the plasticizing effect of carbon dioxide on the membrane. Such a pressure dependence of permeability allows carbon dioxide containing carbon The infiltration behavior of the mixed gas becomes more complicated, and the common double adsorption model can not explain this phenomenon. In this paper, a new modified double adsorption model is proposed, which takes into account the plasticization of the membrane, which shows the pressure dependency of the permeability coefficient and is verified by the experimental results.