title: Adsorption of water and butanol in silicalite-1 film studied with in situ attenuated total reflectance-Fourier transform infrared spectroscopy.
abstract: Biobutanol produced by, e.g., acetone-butanol-ethanol (ABE) fermentation is a promising alternative to petroleum-based chemicals as, e.g., solvent and fuel. Recovery of butanol from dilute fermentation broths by hydrophobic membranes and adsorbents has been identified as a promising route. In this work, the adsorption of water and butanol vapor in a silicalite-1 film was studied using in situ attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy to better understand the adsorption properties of silicalite-1 membranes and adsorbents. Single-component adsorption isotherms were determined in the temperature range of 35-120 °C, and the Langmuir model was successfully fitted to the experimental data. The adsorption of butanol is very favorable compared to that of water. When the silicalite-1 film was exposed to a butanol/water vapor mixture with 15 mol % butanol (which is the vapor composition of an aqueous solution containing 2 wt % butanol, a typical concentration in an ABE fermentation broth, i.e., the composition of the gas obtained from gas stripping of an ABE broth) at 35 °C, the adsorption selectivity toward butanol was as high as 107. These results confirm that silicalite-1 quite selectively adsorbs hydrocarbons from vapor mixtures. To the best of our knowledge, this is the first comprehensive study on the adsorption of water and butanol in silicalite-1 from vapor phase.
authors: †Chemical Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden.
authors: Amirfarrokh
authors: A
authors: Farzaneh
authors: †Chemical Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden.
authors: Ming
authors: M
authors: Zhou
authors: †Chemical Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden.
authors: Elisaveta
authors: E
authors: Potapova
authors: ‡Department of Material and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden.
authors: Zoltán
authors: Z
authors: Bacsik
authors: †Chemical Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden.
authors: Lindsay
authors: L
authors: Ohlin
authors: †Chemical Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden.
authors: Allan
authors: A
authors: Holmgren
authors: †Chemical Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden.
authors: Jonas
authors: J
authors: Hedlund
authors: †Chemical Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden.
authors: Mattias
authors: M
authors: Grahn