Olefin fractionation and catalytic conversion system

摘要

A continuous catalytic process for converting an olefinic feedstock comprising ethylene and C3+ olefins to heavier liquid hydrocarbon product comprising the steps of (a) prefractionating the olefinic feedstock to obtain a gaseous stream rich in ethylene and a liquid stream containing C3+ olefins; (b) vaporizing and contacting the liquid stream from the prefractionating step with hydrocarbon conversion oligomerization catalyst in a catalytic reactor system to provide a heavier hydrocarbon effluent stream comprising distillate, gasoline and lighter hydrocarbons; (c) fractionating the effluent stream to recover distillate, gasoline and lighter hydrocarbons separately; (d) recycling at least a portion of the recovered gasoline as a liquid sorption stream to prefractionating step (a); and (e) further reacting the recycled gasoline together with sorbed C3+ olefins in the catalytic reactor system of step (b).