Figure 6.

a) Decrease of the mixture separation factor, α, for an undiluted equimolar mixture of 1‐butene/isobutene through an MFI membrane at 403 K. b) Fluxes of 1‐butene (open symbols) and isobutene (filled symbols) from an equimolar mixture through an MFI membrane at 403 K. In both cases, the feed pressure was increased up to 21 bar, whereas the permeate pressure was constant at 1 bar. The three data points at each Δp were derived from three independent membrane preparation and permeation tests.56