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- W2523149903 abstract "In this work, we report on the permeation of methanol and dimethyl carbonate (DMC) vapour mixtures through dense membranes made from cross-linked polydimethylsiloxane (PDMS) and from poly[(trimethylsilyl)propyne] (PTMSP). Since methanol forms a methanol-rich pressure-maximum azeotrope with dimethyl carbonate, vapour permeation through hydrophobic (DMC selective) membranes is presumably a favourable method of azeotrope breaking. Permeation of vapours of pure compounds and of binary vapour mixtures was measured at 40 °C for a series of feed mixture compositions. Both membranes showed practically constant permeabilities of both studied compounds, thus indicating that no significant coupling of fluxes occurred. The membrane prepared from PTMSP was ca. 2–5 times more permeable and showed higher separation factors (αDMC ⩽ 4.2) than the one prepared from PDMS (αDMC ⩽ 2.8). In the case of the PDMS, the separation factors decreased with the increasing dilution of the feed mixtures with inert gas (hydrogen). Conversely, the separation factors increased with increasing feed mixture dilution in the case of PTMSP. The highest separation factors were observed near the azeotrope composition for both polymers (ca. 82 mol.% of methanol), thus enabling the development of effective hybrid processes combining rectification columns and vapour permeation units." @default.
- W2523149903 created "2016-09-30" @default.
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- W2523149903 date "2017-03-01" @default.
- W2523149903 modified "2023-10-03" @default.
- W2523149903 title "Separation of methanol-dimethyl carbonate vapour mixtures with PDMS and PTMSP membranes" @default.
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- W2523149903 doi "https://doi.org/10.1016/j.seppur.2016.09.041" @default.
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