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

2007-09-07

2009-12-29

Dang, Thuan Dinh (Department: 1797)

Chemistry of hydrocarbon compounds

Saturated compound synthesis

By isomerization

C585S818000

Reexamination Certificate

active

07638675

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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