METHOD FOR PRODUCING OCTENE BY DIMERIZING ETHYLENE TO FORM BUTENE AND DIMERIZING BUTENE TO FORM OCTENE

• Main Authors: OLIVIER-BOURBIGOU HELENE, HUGUES FRANCOIS, MAGNA LIONEL, BREUIL PIERRE-ALAIN
• Format: Patent
• Language: English
• Published: 11.07.2013
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; APPARATUS THEREFOR; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; GENERAL METHODS OF ORGANIC CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a method for producing octene, which does not use, as a raw material in octene synthesis, a C4 fraction which needs a purification step for removing a nitrogen-containing, oxygen-containing or sulfur-containing polar compound that is dimerization poison and catalyst poison.SOLUTION: The method includes: dimerizing ethylene by use of a titanium-based catalyst or a catalyst system composed of a nickel compound and an aluminum compound to form butene; and dimerizing the butene in the presence of a catalyst system including a nickel complex or a mixture of the nickel complex to form octene. The ethylene dimerizing step and the butene dimerizing step are performed without performing purification step in between, and n-butene obtained by the dimerizing is free from isobutene and butane.