Abstract
Alumina-coated, silicon carbide monoliths were used as supports for B-ZSM-5 zeolite membranes, which were synthesized by in situ hydrothermal crystallization. Both 2 mm×2 mm (66 channels) and 4 mm×4 mm (22 channels) monoliths with effective membrane area/volume ratios of 10.6 and 7.2 cm 2/cm 3, respectively, were used. The membranes separated C 4 and C 6 hydrocarbon isomer vapor mixtures with high selectivities. The selectivities and permeances were comparable to tubular ZSM-5 membranes for butane isomers. The highest ideal selectivities at 473 K were 34 for n-C 4H 10/ i-C 4H 10 and 77 for H 2/ i-C 4H 10. The highest n-C 4H 10/ i-C 4H 10 separation selectivity was 35 at 373 K, and the highest n-hexane/2,2-dimethylbutane separation selectivity was 247 at 436 K.
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