Separation of Methanol-Dimethyl Carbonate Vapour Mixtures with PDMS and PTMSP Membranes.

0507135 - ÚCHP 2020 RIV GB eng J - Journal Article
Vopička, O. - Pilnáček, Kryštof - Friess, K.
Separation of Methanol-Dimethyl Carbonate Vapour Mixtures with PDMS and PTMSP Membranes.
Separation and Purification Technology. Roč. 174, MAR 1 (2017), s. 1-11. ISSN 1383-5866. E-ISSN 1873-3794
Institutional support: RVO:67985858
Keywords : vapour permeation * dimethyl carbonate * mass spectroscopy
OECD category: Chemical process engineering
Impact factor: 3.927, year: 2017
Method of publishing: Limited access

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.
Permanent Link: http://hdl.handle.net/11104/0298195