Processes for the isomerization of paraffins of 5 and 6...

Details Processes for the isomerization of paraffins of 5 and 6... Processes for the isomerization of paraffins of 5 and 6...

2009-12-03

2011-12-06

Griffin, Walter D (Department: 1774)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Combined

C422S129000, C422S211000, C422S234000, C585S738000, C585S818000

Reexamination Certificate

active

08071044

ABSTRACT:
In an isomerization process where the isomerization effluent (108) is fractionated in a deisohexanizer (116) to provide an overhead (118) containing dimethylbutanes and a higher boiling fraction (122) containing normal hexane, the higher boiling is contacted with a selectively permeable membrane (124) to provide a retentate containing methylcyclopentane (128). If desired, the normal hexane-containing permeate can be recycled for isomerization. The preferred membranes are sieving membranes having a C6Permeate Flow Index of at least 0.01 and a C6Permeate 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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