Abstract

Polymer composition has been prepared on the basis of commercial siloxane rubber SKTN-D and tris-(methyldiethoxysiloxy)iron with the reagent ratio 60 : 40 wt %, respectively. Transport parameters of individual hydrocarbons C₁–C₄ have been shown to be comparable with those for polydimethylsiloxane published previously. Permeability coefficients P of single hydrocarbons C₂–C₄ increase with an increase in the penetrant feed pressure. It has been demonstrated for n-butane that such increase in P resulted from both a higher diffusion coefficient and solubility coefficient of the penetrant. For mixed gas permeation of C₁–C₄, an increase in P of methane and a decrease in P of n-butane are observed with increasing the feed pressure. These trends may be explained by the plasticization of the polymer compound and the presence of “rigid” polycyclic structures based on the iron-siloxane component. Similar behavior has been observed for methane and C₂₊ components with separating quaternary mixture of C₁–C₄ hydrocarbons. Separation selectivities with respect to methane decreased with increasing feed pressure; however, they become comparable with corresponding results for previously studied substituted polytricyclonones.

中文翻译：

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含铁硅氧烷成分分离C 1 –C 4烃混合物

摘要

已经基于市售的硅氧烷橡胶SKTN-D和三-（甲基二乙氧基甲硅烷氧基）铁分别以60:40重量％的试剂比率制备了聚合物组合物。单个碳氢化合物C ₁ –C _4的传输参数已显示出与先前公布的聚二甲基硅氧烷相当的传输参数。单一烃类C ₂ –C _4的渗透系数P随着渗透剂进料压力的增加而增加。对于正丁烷已证明，P的这种增加是由于渗透剂的较高扩散系数和溶解系数所致。对于C _1的混合气体渗透–C ₄，随着进料压力的增加，甲烷的P升高，正丁烷的P降低。这些趋势可以通过高分子化合物的增塑和基于铁-硅氧烷组分的“刚性”多环结构的存在来解释。对于甲烷和C ₂₊组分，使用分离的C ₁ -C ₄烃季混合物，也观察到了类似的行为。甲烷的选择性随进料压力的增加而降低；然而，它们与先前研究的取代的聚三环酮的相应结果具有可比性。