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

C - Chemistry – Metallurgy – 07 – C

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

Patent

CA 2601211

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 C6 Permeate Flow Index of at least 0.01 and a C6 Permeate Flow Ratio of at least 1.25:1.

L'invention porte sur un procédé d'isomérisation dans lequel l'effluent d'isomérisation (108) est fractionné dans un désisohexaniseur (116) pour donner un distillat de tête (118) contenant des diméthylbutanes, et une fraction à point d'ébullition supérieur (122), contenant de l'hexane normal, laquelle est mise en contact avec une membrane (124) à perméabilité sélective de manière à obtenir un rétentat contenant du méthylcyclopentane (128). Si on le désire, on peut recycler le perméat contenant l'hexane normal en vue de son isomérisation. Les membranes préférées sont des membranes tamis présentant un indice d'écoulement de perméat C6 d'au moins 0,01, et un rapport d'écoulement de perméat C6 d'au moins 1,25:1.

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