Patent ID: 6579419
Filing Date: 2003-06-17
Classification: C07C

Abstract:
A process for the purification of norbornene obtained by reaction of ethylene and at least one of dicyclopentadiene and cyclopentadiene resulting in a crude reaction mixture comprising:light impurities, the boiling temperatures of which are lower than that of norbornene; medium-heavy impurities, the boiling temperatures of which are between that of norbornene and that of ethylnorbornene; and heavy impurities, the boiling temperatures of which are greater than that of ethylnorbornene, the latter being included in said heavy impurities, wherein a first distillation of the crude reaction mixture (1) is carried out in a first tailing column (C1) having an inlet, removing a portion of the heavy impurities and a portion of the medium-heavy impurities; then a second distillation of the crude mixture, thus tailed, is carried out in a topping column (C2), removing the light impurities; and a third distillation of the mixture, thus topped, is subsequently carried out in a second tailing column (C3), removing the remainder of the heavy and medium-heavy impurities, and from said second tailing column (C3) recovering a top product of purified norbornene.