Temperature Dependence of Light Hydrocarbons Sorption and Transport in Dense Membranes Based on Tetradecyl Substituted Silicone Rubber
Solubility-selective polymer membranes are promising materials for C<sub>3+</sub> hydrocarbons removal from methane and other permanent gas streams. To this end, a dense solubility-selective membrane based on crosslinked poly(tetradecyl methyl siloxane) was synthesized. Sorption of metha...
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| Format: | Article |
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MDPI AG
2023-01-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/13/2/124 |
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| author | Alexander O. Malakhov Stepan E. Sokolov Evgenia A. Grushevenko Vladimir V. Volkov |
| author_facet | Alexander O. Malakhov Stepan E. Sokolov Evgenia A. Grushevenko Vladimir V. Volkov |
| author_sort | Alexander O. Malakhov |
| collection | DOAJ |
| description | Solubility-selective polymer membranes are promising materials for C<sub>3+</sub> hydrocarbons removal from methane and other permanent gas streams. To this end, a dense solubility-selective membrane based on crosslinked poly(tetradecyl methyl siloxane) was synthesized. Sorption of methane, ethane, and <i>n</i>-butane in the polymer was measured in the temperature range of 5–35 °C. An abnormal temperature dependence of sorption was detected, contradicting the generally accepted view of sorption as an exothermic process. In particular, methane shows minimal sorption at 5 °C. The abnormal temperature behavior was found to be related to crystallization of the alkyl side chains at temperatures below ~10 °C. Gas permeability determined by sorption and permeation methods are in reasonable agreement with each other and decrease in the order <i>n</i>-C<sub>4</sub>H<sub>10</sub> > C<sub>2</sub>H<sub>6</sub> > CH<sub>4</sub>. The solubility of these alkanes changes in the same order indicating that poly(tetradecyl methyl siloxane) is indeed the sorption-selective membrane. The diffusivities and permeabilities of studied alkanes declined with decreasing temperature, whereas the <i>n</i>-C<sub>4</sub>H<sub>10</sub>/CH<sub>4</sub> permselectivity increases with decreasing temperature, reaching a value of 23 at 5 °C. |
| first_indexed | 2024-03-11T08:26:56Z |
| format | Article |
| id | doaj.art-14f3ed79e66e4e4f99958dce5b6b3784 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-11T08:26:56Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-14f3ed79e66e4e4f99958dce5b6b37842023-11-16T22:01:41ZengMDPI AGMembranes2077-03752023-01-0113212410.3390/membranes13020124Temperature Dependence of Light Hydrocarbons Sorption and Transport in Dense Membranes Based on Tetradecyl Substituted Silicone RubberAlexander O. Malakhov0Stepan E. Sokolov1Evgenia A. Grushevenko2Vladimir V. Volkov3A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Prospect 29, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Prospect 29, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Prospect 29, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Prospect 29, 119991 Moscow, RussiaSolubility-selective polymer membranes are promising materials for C<sub>3+</sub> hydrocarbons removal from methane and other permanent gas streams. To this end, a dense solubility-selective membrane based on crosslinked poly(tetradecyl methyl siloxane) was synthesized. Sorption of methane, ethane, and <i>n</i>-butane in the polymer was measured in the temperature range of 5–35 °C. An abnormal temperature dependence of sorption was detected, contradicting the generally accepted view of sorption as an exothermic process. In particular, methane shows minimal sorption at 5 °C. The abnormal temperature behavior was found to be related to crystallization of the alkyl side chains at temperatures below ~10 °C. Gas permeability determined by sorption and permeation methods are in reasonable agreement with each other and decrease in the order <i>n</i>-C<sub>4</sub>H<sub>10</sub> > C<sub>2</sub>H<sub>6</sub> > CH<sub>4</sub>. The solubility of these alkanes changes in the same order indicating that poly(tetradecyl methyl siloxane) is indeed the sorption-selective membrane. The diffusivities and permeabilities of studied alkanes declined with decreasing temperature, whereas the <i>n</i>-C<sub>4</sub>H<sub>10</sub>/CH<sub>4</sub> permselectivity increases with decreasing temperature, reaching a value of 23 at 5 °C.https://www.mdpi.com/2077-0375/13/2/124poly(tetradecyl methyl siloxane)light hydrocarbonssorptiondiffusionpermeationselectivity |
| spellingShingle | Alexander O. Malakhov Stepan E. Sokolov Evgenia A. Grushevenko Vladimir V. Volkov Temperature Dependence of Light Hydrocarbons Sorption and Transport in Dense Membranes Based on Tetradecyl Substituted Silicone Rubber Membranes poly(tetradecyl methyl siloxane) light hydrocarbons sorption diffusion permeation selectivity |
| title | Temperature Dependence of Light Hydrocarbons Sorption and Transport in Dense Membranes Based on Tetradecyl Substituted Silicone Rubber |
| title_full | Temperature Dependence of Light Hydrocarbons Sorption and Transport in Dense Membranes Based on Tetradecyl Substituted Silicone Rubber |
| title_fullStr | Temperature Dependence of Light Hydrocarbons Sorption and Transport in Dense Membranes Based on Tetradecyl Substituted Silicone Rubber |
| title_full_unstemmed | Temperature Dependence of Light Hydrocarbons Sorption and Transport in Dense Membranes Based on Tetradecyl Substituted Silicone Rubber |
| title_short | Temperature Dependence of Light Hydrocarbons Sorption and Transport in Dense Membranes Based on Tetradecyl Substituted Silicone Rubber |
| title_sort | temperature dependence of light hydrocarbons sorption and transport in dense membranes based on tetradecyl substituted silicone rubber |
| topic | poly(tetradecyl methyl siloxane) light hydrocarbons sorption diffusion permeation selectivity |
| url | https://www.mdpi.com/2077-0375/13/2/124 |
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