Catalyst for the dimerization of olefins

• Main Authors: PLUZHNOV, STANISLAV K, SMETANJUK, VLADIMIR I, KABANOV, VIKTOR A, MARTYNOVA, MARINA A
• Format: Patent
• Language: English
• Published: 05.02.1980
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR RELEVANT APPARATUS; TRANSPORTING

A method and composition for dimerization of olefins containing 2 to 4 carbon atoms, wherein at least one of said olefins is mixed, in a medium of hydrocarbon or halogenated hydrocarbon solvents at a temperature ranging from 0 DEG to 100 DEG C. under a pressure of from 1 to 40 atm with a two-component catalyst consisting of: (1) a complex of a nickel salt with a tertiary phosphine or tertiary phosphite; (2) an organoaluminum compound comprising a natural or synthetic carbochain rubber, swellable in said solvents, containing 2 to 50 mol. % of AlRX units, wherein R is an alkyl with at most 8 carbon atoms, X is a halogen; atomic ratio Al/Ni being varied within the range of from 1 to 100. The catalyst employed in the method according to the present invention features high stability (retaining its original activity for a long time); it is not crushed and can be readily regenerated. The catalyst demonstrates high selectivity: a content of butene-1 in a mixture of butenes obtained from dimerization of ethylene is as high as 80%; content of methylpentenes in a dimerizate resulting from dimerization of propylene is as high as 90 to 95%.