Verfahren zur Isomerisierung von olefinischen Kohlenwasserstoffen

摘要

Olefins capable of undergoing double bond migration are isomerized in the presence of a halogenated alumina, obtained by contacting alumina at elevated temperature with a halogenated organic compound preferably a halogenated methane such as those described in Specifications 953,187 and 956,684. The olefin may be mono- or poly-olefin preferably of 4-6 carbon atoms and isomerization is effected at up to 300 DEG C. at any pressure in the vapour phase and preferably in the presence of nitrogen. The catalyst may contain up to 50% of an oxide of an element of Group II-V and a hydrogenating metal or compound thereof of Group VIa or VIII, and preferably contains fluorine in an amount of at least 1% up to 3.4 x 10-4 grams/sq. metre of surface area. The isomerization effected is usually double bond migration without skeletal rearrangement. The isomerization of 4-methylpentene-1 to 2-methylpentene-1 and -2 is exemplified.