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Separation of isoprene from biologically-derived gas streams

Journal Article · · Separation Science and Technology
Renewable organic precursors, including olefinic compounds such as isoprene, have attracted interest from the polymer and pharmaceutical industries. Biologically-derived processes can generate these target compounds; however, their gaseous product streams are complex mixtures of condensable organic vapors (COVs), water vapor, carbon dioxide (CO2), and/or nitrogen (N2). Because COVs, CO2 and water vapor are known to alter polymer membranes, mixed gas separations data at ambient and elevated temperatures are limited. Here, this study focused on two classes of polymer membranes, glassy [polyetherimide (Ultem®)] and a rubbery [polydimethylsiloxane (PDMS)] with results indicating that isoprene separation is possible in humidified gas environment (2–4 vol% water). Gas permeabilities of these membranes did not noticeably change in the presence of humidity; however, the selectivity of these membranes was significantly lower compared to their performance under dry conditions. The role of water vapor in gas transport was derived from the energy of activation of permeation (Ep) for PDMS and Ultem® from 30–80°C in humidified mixed gas streams. For both polymers, Ep data shows a slight decrease in selectivity with the other gases (hydrogen, N2, CO2, and methane) at elevated temperatures in the presence of water vapor. Thus, these COVs separations are feasible with polymer membranes in the presence of humidified gas streams, even in the case of glassy and rubbery membranes in series.
Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1905080
Report Number(s):
INL/JOU-21-62203-Rev000
Journal Information:
Separation Science and Technology, Journal Name: Separation Science and Technology Journal Issue: 14 Vol. 57; ISSN 0149-6395
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English

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