Patent ID: 6153804
Filing Date: 2000-11-28
Classification: B01D,C10G

Abstract:
A process for producing cyclopentane and cyclopentene from pyrolysis gasoline, which comprises(a) first partially hydrogenating the pyrolysis gasoline to convert dienes and acetylenes present therein selectively into the corresponding alkanes and alkenes,(b) subsequently separating the partly hydrogenated pyrolysis gasoline in a first distillation column, said distillation column having a bottom take off and a top take off wherein the partly hydrogenated pyrolysis gasoline is fed into the first distillation column at a point between the bottom takeoff and the top takeoff, intob.sub.1) a top fraction comprising C.sub.3 and C.sub.4 hydrocarbons which top fraction is taken off at the top takeoff of the first distillation column,b.sub.2) a side stream faction comprising at least 40% by weight of cyclopentane and cyclopentene which side stream fraction is taken off at a suitable tray between the top takeoff and the bottom takeoff of the first distillation column, andb.sub.3) a bottom fraction consisting essentially of C.sub.6 hydrocarbons and higher boiling components of the partially hydrogenated gasoline which bottom fraction is taken off at the bottom takeoff of the first distillation column, and(c) finally isolating a mixture of cyclopentane and cyclopentene from the side stream fraction by fractional distillation in a second distillation column, said second distillation column having a bottom take off and a top take off and the side stream fraction being fed into the column at a point of the second column between the bottom takeoff and the top takeoff.