Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor
Reexamination Certificate
2011-01-11
2011-01-11
Mayes, Melvin C (Department: 1793)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
C502S121000, C502S102000, C502S124000, C502S125000, C502S103000, C585S527000, C585S513000, C585S514000, C585S516000, C585S017000
Reexamination Certificate
active
07867938
ABSTRACT:
A catalyst precursor composition comprising: a source of chromium, molybdenum or tungsten; a first ligand having the general formula (R1)(R2P—X—P(R3)(R4); and a second ligand having the general formula (R1′)(R2′)P—X′—P(R3′)(R4′). The present invention also relates to a catalyst system comprising the catalyst precursor composition of the present invention and a cocatalyst. The present invention further relates to a process for the trimerization and tetramerization of olefinic monomers, particularly the trimerization and tetramerization of ethylene to 1-hexene and 1-octene, wherein the process comprises contacting at least one olefinic monomer with the catalyst system of the present invention.
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Anthea Carter, Steven A. Cohen, Neil A. Cooley, Aden Murphy, James Scott, and Duncan F. Wass, “High Activity Ethylene Trimerisation Catalysts Based on Diphosphine Ligands,” The Royal Society of Chemistry 2002, CHEMCOMM 2002, pp. 858-859.
De Boer Eric Johannes Maria
On Quoc An
Smit Johan Paul
van der Heijden Harry
van Zon Arie
Mayes Melvin C
Qian Yun
Shell Oil Company
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