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Separation of binary C5 and C6 hydrocarbon mixtures through MFI zeolite membranes

✍ Scribed by Manuel Arruebo; John L. Falconer; Richard D. Noble

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
251 KB
Volume
269
Category
Article
ISSN
0376-7388

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✦ Synopsis

MFI membranes on stainless-steel tubular supports separated mixtures of n-pentane/isoprene; the highest n-pentane/isoprene selectivity was 74, which was obtained at 333 K for a B-ZSM-5 membrane. Separation is due to faster diffusion of the linear alkane. The single-component permeance of n-pentane was higher than its permeance in the mixture because the slower-diffusing isoprene decreases the rate of n-pentane diffusion. No effects due to isoprene polymerization were observed, and the acid sites in B-ZSM-5 did not affect the separations. The separation selectivity for an equimolar mixture of n-hexane and 2,2-dimethylbutane was greater than 300 at 373 K for all membranes, and this was used as an indication of membrane quality.

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