Lummus Technology’s Olefins Conversion Technology (OCT) is used to combine n-butenes with ethylene to produce polymer-grade propylene. Two chemical reactions take place: propylene is formed by the metathesis of ethylene and butene-2; and butene-1 is isomerized to butene-2 as butene-2 is consumed in the metathesis reaction.
This technology can be used with a variety of C4 streams including the mixed C4s produced in steam cracking, raffinate C4s from MTBE or butadiene extraction, and C4s produced in FCC units.