Patent ID: 6590132
Filing Date: 2003-07-08
Classification: B01D,C07C,C10G

Abstract:
A process for separating C4 olefin from C8 olefin by distillation comprising:a) feeding a mixure of C4 olefin and C8 olefin to a distillation column; b) feeding an intermediary comprising a hydrocarbon having a boiling point that is greater than a boiling point of C4 olefin and less than a boiling point of C8 olefin at the same conditions to the distillation column, said intermediary comprising between 2 and 10 wt-% of all feed to the distillation column; c) withdrawing an overhead distillate product containing a smaller volume percentage of said C8 olefin and said intermediary and a larger volume percentage of said C4 olefin than contained in said mixture; and d) withdrawing a bottoms product containing a larger volume percentage of said C8 olefin and said intermediary and a smaller volume percentage of said C4 olefin than contained in said mixture, a bottoms temperature in the bottoms of the distillation column being less than 300Â° F.