Patent ID: 6887434

Claim:
An apparatus for preparing propene and optionally 1-butene, comprising a metathesis reactor (R01) for reacting 1-butene with 2-butene whose outlet leads to a distillation column (K101), which can be configured as a dividing wall column, a side column or a 2-column arrangement, for separating C 2/3 low-boiling, C 4 intermediate-boiling and C 5 + high boiling phases, where the low boiler outlet leads to a column (K301) for separating ethene and propene, the intermediate boiler outlet leads to the reactor (R01) or the discharge and the high boiler outlet leads to a reactor (R02) for reacting 2-pentene with ethene whose outlet leads to a distillation column (K201), which can be configured as a dividing wall column, a side column or a 2-column arrangement, for separating C 2/3 low-boiling, C 4 intermediate-boiling and C 5 + high-boiling phases, where the low boiler outlet leads to the column (K301), the intermediate boiler outlet leads to an isomerization reactor (R03) for partially isomerizing 1-butene to 2-butene and optionally additionally to discharge, where the outlet of the isomerization reactor (R03) together with the intermediate boiler outlet from (K101) leads to the reactor (R01) and the high boiler outlet from column (K201) leads to the return to (R02) or to discharge, where the ethene outlet from the column (K301) and an ethene feed line lead to the reactor (R02).