Process for preparing proylene and 1-butene

• Main Authors: SCHWAB, PETER, SCHULZ, RALF, OOST, CARSTEN, BREITSCHEIDEL, BORIS, SCHULZ, MICHAEL
• Format: Patent
• Language: English; French; German
• Published: 18.08.1999
• Edition: 6
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; APPARATUS THEREFOR; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL METHODS OF ORGANIC CHEMISTRY; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR RELEVANT APPARATUS; TRANSPORTING

Die Herstellung von Propen und gegebenenfalls 1-Buten erfolgt durch a) Umsetzung von 1-Buten und 2-Buten zu Propen und 2-Penten in Gegenwart eines Metathesekatalysators, der mindestens eine Verbindung eines Metalls der VII, VIIb oder VIII Nebengruppe des Periodensystems der Elemente enthält, b) anschließendes Trennen des gebildeten Propens und 2-Pentens, c) anschließende Umsetzung des 2-Pentens mit Ethen zu Propen und 1-Buten in Gegenwart eines Metathesekatalysators, der mindestens eine Verbindung eines Metalls der VIb, VIIb oder VIII Nebengruppe des Periodensystems der Elemente enthält, d) anschließendes Trennen des gebildeten Propens und 1-Butens, e) zumindest teilweises Ausschleusen des gebildeten 1-Butens und/oder zumindest teilweises Isomerisieren des gebildeten 1-Butens zu 2-Buten in Gegenwart eines Isomerisierungskatalysators und anschließendes Rückführen des nicht ausgeschleusten 1-Butens und gebildeten 2-Butens gemeinsam mit einem Teil der in Schritt a) nicht umgesetzten C4-Fraktion in Schritt a). Preparation of propene and optionally 1-butene comprises converting butene isomers to propene isomers using metathesis catalyst and converting formed 2-pentene to propene and 1-butene, isolating and recycling the 2-butene fraction. Preparation of propene and optionally 1-butene comprises: (a) converting 1-butene and 2-butene in the presence of a metathesis catalyst containing group VIb, VIIb or VIII metals; (b) removing propene and 2-pentene formed; (c) converting the 2-pentene using ethene to propene and 1-butene in the presence of the metathesis catalyst in (a); (d) removing propene and 1-butene formed; and (e) discharging the 1-butene and partially isomerizing 1-butene to 2-butene in the presence of a catalyst and recycling the 1-butene and 2-butene with a part of the unreacted 4C-fraction from (a) to (a). An Independent claim is also included for the apparatus for carrying out the preparation of propene and 1-butene comprising a metathesis reactor (R01) connected to a distillation column (K101) for removing 2/3C low boiling, 4C middle boiling and 5C+ high boiling phases; column (K301) for removing ethene and propene; and reactor (R02) for reacting 2-pentene with ethene.