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The evaluation of the C1-C4 hydrocarbon permeability parameters in the thin film composite membranes

机译：薄膜复合膜中C1-C4烃渗透参数的评价

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摘要

A novel approach to the evaluation of the C-1-C-4 hydrocarbon (pure and mixed-gas) permeability parameters in the thin film composite membranes with rubbery or glassy-like selective layers is presented. The permeability measurements are performed for the C-1-C-4 hydrocarbons on the commercially available membranes MDK (based on polydimethylsiloxane (PDMS)) at the temperature range of -20 degrees up to +40 degrees C under linear heating. The values of the gas permeability coefficients P and the apparent activation energy E-P were measured during same experiment. The solubility data (S and Delta H-S) were calculated using the Pierotti's statistical-thermodynamic model. The diffusion coefficients were calculated indirectly using the permeability and solubility data assuming the solution-diffusion model for permeation. The equal data sets were obtained for the polyisoprene membranes and the polyvyniltrimethylsilane ones. It is concluded that the ideal C-1-C-4-hydrocarbon separation selectivity is controlled by the kinetic component (selectivity of diffusion). The article also describes the permeability increase of propane, butane (pure and in mixtures) under the temperature pull down in the PDMS (being consistent with the lower activation diffusion energy E-D of those hydrocarbons in the typical rubber-like polymeric matrix which is a thin selective layer). The results of this study will be useful in understanding of the fundamental aspects of the membrane C-1-C-4 separation phenomena, and for the fast separation parameters evaluation of the lower hydrocarbon mixtures using the polymeric membranes as well. (C) 2017 Elsevier B.V. All rights reserved.
机译：提出了一种与橡胶状或玻璃状选择层的薄膜复合膜中C-1-C-4烃（纯和混合气）渗透性参数评价的新方法。在市售膜MDK上的C-1-C-4烃（基于聚二甲基硅氧烷（PDMS））在直线加热下的温度范围内的温度范围内进行渗透率测量。在相同实验期间测量透气性系数P和表观活化能量E-P的值。使用Pierotti统计 - 热力学模型计算溶解度数据（S和DELTA H-S）。假设溶液扩散模型的渗透率和溶解度数据间接计算扩散系数。为聚异戊二烯膜和聚维尔苄基硅烷硅烷获得等数据集。结论是，理想的C-1-C-4-烃分离选择性由动力学组分（扩散的选择性）控制。本文还描述了在PDMS中的温度下拉下丙烷，丁烷（纯和混合物）的渗透性增加（与典型的橡胶状聚合物基质中那些碳氢化合物的较低的激活扩散能量为薄选择层）。该研究的结果可用于理解膜C-1-C-4分离现象的基本方面，以及使用聚合物膜的低烃混合物的快速分离参数评价。 （c）2017 Elsevier B.v.保留所有权利。

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