Patent ID: 11859025
Assignee: CHEVRON PHILLIPS CHEMICAL COMPANY LP
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 9:
10. A process comprising:
a) forming a first mixture in an activation vessel, the first mixture comprising:
1) a first catalyst system comprising i) a first heteroatomic ligand chromium compound complex and a first organoaluminum compound, or ii) a first heteroatomic ligand, a first chromium compound, and a first organoaluminum compound,
2) a first feed comprising ethylene, a second catalyst system comprising i) a second heteroatomic ligand chromium compound complex and a second organoaluminum compound, or ii) a second heteroatomic ligand, a second chromium compound, and a second organoaluminum compound, a second organic reaction medium, a second oligomer product, and optionally hydrogen,
3) optionally, a first organic reaction medium, and
4) optionally, hydrogen;

b) maintaining the first mixture in the activation vessel for an average residence time;
c) introducing into a reaction zone:
i) ethylene,
ii) the first mixture from step b),
iii) the second organic reaction medium, and
iv) optionally, hydrogen; and

d) forming an oligomer product in the reaction zone;
wherein a portion of a reaction zone effluent is fed to the activation vessel as the first feed, and
wherein the average residence time of the first mixture in the activation vessel is in a range from 10 sec to 45 min.