Production of propene and hexene from butenes in a raffinate II C4 fraction comprises reaction with ethene on a Group VIb, VIIb or VIII metal metathesis catalyst

摘要

Production of propene and hexene from butenes in a raffinate II C 4 fraction. Production of propene and hexene from butenes in a raffinate II C 4 fraction comprises: (a) reacting the butenes with ethene in a butene:ethene molar ratio of 1:0.05-0.6 in the presence of a Group VIb, VIIb or VIII metal metathesis catalyst; (b) distilling the effluent to obtain a light fraction A comprising C 2-C 3 olefins and a heavy fraction B comprising C 4-C 6 olefins and butanes; (c) distilling fraction A to obtain an ethene fraction for recycle to step (a) and a propene fraction as product; (d) distilling fraction B to obtain a light fraction C comprising butenes and butanes, a medium fraction D comprising pentene and a heavy fraction E comprising hexene; and (e) at least partly recycling fractions C and D and withdrawing fraction F as product.