Amino phosphine
AssigneeNOVA Chemicals (International) S.A.
InventorsXiaoliang Gao, Charles Ashton Garret Carter, Liangyou Fan, Lee Douglas Henderson
Life of this patent
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Abstract
A new P-N-P ligand in which each phosphorus atom is bonded to two ortho-fluorine substituted phenyl groups is useful in ethylene oligomerizations. In combination with i) a source of chromium and ii) an activator such as methalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of hexenes and octenes. The hexenes and octenes produced with this ligand contain very low levels of internal olefins when produced under preferred reaction conditions.
Claims12
-3. (canceled)
A process for the oligomerization=of ethylene to a mixture comprising hexene-1 and octene-1, said process comprising contacting ethylene under oligomerization reaction conditions with a catalyst system to produce an oligomerization product comprising hexene-1 and octene-1, said catalyst system comprising:
- i) a source of chromium
- ii) a ligand defined by the formula
- wherein each of X1 to X4 is independently selected from the group consisting of F, Br, or Cl;
- and each of R;
- ort1 to ort4 and R1 to R12 is independently selected from the group consisting of H and non-interfering substituents;
- and
- iii) an activator.
Dependencies are inferred from the claim text.