Oligomerisation of ethylene to mixtures of 1-hexene and 1-octene
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United States of America Patent
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Jan 3, 2017
Grant Date -
Mar 24, 2016
app pub date -
May 6, 2014
filing date -
May 9, 2013
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Abstract
A process for the oligomerization, preferably the tetramerization, of ethylene to predominantly 1-hexene or 1-octene or mixtures of 1-hexene and 1-octene includes contacting ethylene with a catalyst under ethylene oligomerization conditions. The catalyst comprises a source of chromium, a diphosphine ligating compound, and optionally an activator. The diphosphine ligating compound includes at least one substituted aromatic ring bonded to a phosphorous atom. The substituted aromatic ring is substituted at a ring atom adjacent to the ring atom bonded to the respective phosphorous atom with a group Y, where Y is of the form —AREWG, A being O, S or NR5, where R5 is a hydrocarbyl, heterohydrocarbyl or organoheteryl group, and REWG is an electron withdrawing group.
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