Patent ID: 6156854
Filing Date: 2000-12-05
Classification: C08F,Y10S

Abstract:
A process for hydrogenating an unsaturated hydrocarbon comprising:(a) introducing an unsaturated hydrocarbon into a reaction zone for a reaction residence time, wherein a catalyst system is present in the reaction zone the catalyst system comprising a metallocene of the general formula (Cp).sub.m TiX.sub.n, wherein Cp is a substituted or un-substituted cyclopentadienyl ring, X is a halogen, m=1-2, n=2-3, and wherein m+n =4;(b) introducing hydrogen at an addition rate to the reaction zone during the introducing of step (a), wherein the hydrogen is introduced to achieve a first hydrogen concentration, with the introduction subsequently stopped to allow the hydrogen to deplete at a depletion rate to a second hydrogen concentration; and(c) repeating step (b) prior to expiration of the reaction residence time.