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

C - Chemistry, Metallurgy

07

C

C07C 5/27 (2006.01) B01J 8/00 (2006.01) C07C 7/13 (2006.01)

Patent

CA 2601219

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 C4 Permeate Flow Index of at least 0.01 and a C4 Permeate Flow Ratio of at least 1.25:1.

La présente invention se rapporte à un procédé d'isomérisation de butane normal, qui consiste : à fractionner l'effluent d'isomérisation (108, 114) dans un déisobutaniseur (116), afin d'obtenir une fraction d'ébullition inférieure (118) contenant au moins 80 % poids d'isobutane, et une fraction d'ébullition supérieure (122) contenant du butane normal et au moins 10 % poids d'isobutane ; à mettre la fraction d'ébullition supérieure (122) en contact avec une membrane sélectivement perméable (124), afin de former un perméat (126) contenant du butane normal et un rétentat (128) contenant au moins 80 % poids d'isobutane. Les membranes préférées sont des membranes de criblage présentant un indice de flux de perméat C4 d'au moins 0,01, et un rapport de flux de perméat C4 d'au moins 1,25:1.

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