A new technique for preparation of PDMS/ceramic nanocomposite membrane for gaseous hydrocarbons separation

E. Jannatdoust, A. A. Babaluo, F. Abbasi, M. Akhfash Ardestani, M. Peyravi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A novel composite membrane using polydimethylsiloxane (PDMS) as a top active layer and ceramic nanocomposite as the support layer was developed for the gaseous hydrocarbons separation. For the fabrication of hybrid membranes, nanocomposite technology applied for manufacturing ceramic supports with controllable microstructures. Also, a new method was used for coating a uniform and no penetrated polymeric layer. Top layer of ceramic support with nanocomposite microstructures was fabricated using 5 wt % α-Al 2O 3-SiO 2 bidispersed suspensions with optimum weight fraction of second phase (SiO 2) based on the fractional collision frequency theory. PDMS selective layer was coated on the outer surface of the porous ceramic nanocomposite support by dip-coating method. In this respect, the effect of several parameters such as pretreatment temperature, PDMS solution concentration, and number of coated polymeric layers on prepared layers morphology and hybrid membrane performance in the separation of condensable hydrocarbons (iso and n-butane) from hydrogen were investigated. The results showed that the membranes fabricated at 140°C as pretreatment temperature and three polymeric layers by 7, 15, and 15 wt % PDMS concentration, respectively, had a high selectivity (>25 at 2 bar)) in C 4H 10/H 2 separation.

Original languageEnglish
Pages (from-to)1077-1087
Number of pages11
JournalJournal of Applied Polymer Science
Volume126
Issue number3
DOIs
Publication statusPublished - 5 Nov 2012
Externally publishedYes

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