Patent ID: 6264799
Filing Date: 2001-07-24
Classification: C07C,Y10S

Abstract:
Process for isolating cyclopentane and additionally isopentane by distillative separation of a partially hydrogenated pre-benzene fraction or a partially hydrogenated C.sub.5 fraction including 2-methyl-2-butene, comprising the steps ofa) taking off as first top product low boilers having boiling points below that of 2-methyl-2-butene in a first fractional distillation of the partially hydrogenated pre-benzene fraction or the partially hydrogenated C.sub.5 fraction, and taking off as first bottom product high boilers comprising 2-methyl-2-butene and hydrocarbons having boiling points higher than that of 2-methyl-2-butene, andb) subjecting the first bottom product to a catalytic hydrogenation and subsequently separating the first bottom product, in a fractional distillation, into isopentane as top product, cyclopentane as side stream and hydrocarbons having at least 6 carbon atoms as bottom product.