Hydrocarbon Molecules Separation using Nanoporous Materials

Lawson, Shane; Krishnamurthy, Anirudh; Gelles, Teresa; Thakkar, Harshul; Rownaghi, Ali A.; Rezaei, Fateme

doi:10.1016/b978-0-12-818487-5.00007-8

Cited by 1 publication

(1 citation statement)

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“…Membranes are considered a lower-energy alternative, permitting the separation of natural gas into two streams, one enriched by light hydrocarbons (C 2+ ) and the other by methane. Solubility-controlled (sorption-selective) rubbery and glassy polymer membranes are promising materials for C 2+ removal [ 1 , 2 , 3 , 4 , 5 , 6 ]. Among amorphous rubbers, polydimethylsiloxane (PDMS) is a commercially available membrane for recovering condensable gases C 3+ from their mixtures with permanent gases.…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of Light Hydrocarbons Sorption and Transport in Dense Membranes Based on Tetradecyl Substituted Silicone Rubber

et al. 2023

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Solubility-selective polymer membranes are promising materials for C3+ 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 n-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 n-C4H10 > C2H6 > CH4. 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 n-C4H10/CH4 permselectivity increases with decreasing temperature, reaching a value of 23 at 5 °C.

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