Processes for the isomerization of normal butane to isobutane

Details Processes for the isomerization of normal butane to isobutane Processes for the isomerization of normal butane to isobutane

2011-07-19

2011-07-19

Griffin, Walter D (Department: 1774)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including solid, extended surface, fluid contact reaction...

C422S129000, C422S187000, C422S234000, C585S738000, C585S818000

Reexamination Certificate

active

07981376

ABSTRACT:
In a normal butane isomerization process where the isomerization effluent (108, 114) is fractionated in a deisobutanizer (116) operated such that a lower boiling fraction (118) is provided containing at least 80 mass-% isobutane and a higher boiling fraction (122) containing normal butane and at least 10 mass-% isobutane. The higher boiling fraction (122) is contacted with a selectively permeable membrane (124) to provide a permeate (126) containing normal butane-containing and a retentate (128) containing at least 80 mass-% isobutane. The preferred membranes are sieving membranes having a C4Permeate Flow Index of at least 0.01 and a C4Permeate Flow Ratio of at least 1.25:1.

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van de Graaf et al, Effect of Operating Conditions and Membrane Quality on the Separation Performance of Composite Silicalite-1 Membranes, 1998, Ind. Eng. Chem. Res., 37, 4071-4083.

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