Processes for the isomerization of feedstocks comprising...

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 2600128

In an isomerization process where the isomerization effluent (114) is fractionated in a deisohexanizer (116) to provide a lower boiling fraction (122) containing dimethylbutanes, a higher boiling fraction containing methylpentanes and a bottoms stream (120) containing normal hexane and heavies, the bottoms stream is contacted with a selective permeation membrane (124) to provide a normal hexane-containing permeate (128) suitable for recycle to the isomerization. The energy consumption of the deisohexanizer (116) can be reduced without adversely affecting the octane rating of the overhead (122).

L~invention concerne un procédé d~isomérisation selon lequel l~effluent d~isomérisation (114) est fractionné dans un déisohexaniseur (116) pour donner une fraction à température d~ébullition basse (122) contenant des diméthylbutanes, une fraction à plus haute température d~ébullition contenant des méthylpentanes et un résidu (120) contenant l~hexane normal et les composés lourds, ledit résidu étant mis au contact d~une membrane de perméation sélective (124) pour donner un perméat contenant l~hexane normal (128) adapté au recyclage pour l~isomérisation. La consommation d~énergie du déisohexaniseur (116) peut être réduite sans que l~indice d~octane du distillat de tête (122) n~en soit lésé.

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