Patent ID: 6433240
Filing Date: 2002-08-13
Classification: B01D,C07C,Y02P

Abstract:
A process for preparing propene and optionally 1-butene bya) reacting a C4 fraction of 1-butene and 2-butene to give propene and 2-pentene in the presence of a metathesis catalyst comprising at least one compound of a metal of transition group VIb, VIIb or VIII of the Periodic Table of the Elements; b) subsequently separating the propene and 2-pentene formed from the C4 fraction in step a); c) subsequently reacting the 2-pentene from step b) with ethene to give propane and 1-butene in the presence of a metathesis catalyst comprising at least one compound of a metal of transition group VIb, VIIb or VIII of the Periodic Table of the Elements; d) subsequently separating the propene and 1-butene formed in step c); e) partially isomerizing at least some of the 1-butene from step d) in the presence of an isomerization catalyst to give 2-butene and returning the resulting mixture of 1-butene and 2-butene to step a); and f) discharging the propane from steps b) and d).