Methods for recycling ethylene in an ethylene oligomerization reactor system
AssigneeChevron Phillips Chemical Company LP
InventorBruce E. Kreischer
Life of this patent
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Abstract
Methods for recycling ethylene from a reaction zone effluent stream from an oligomerization reaction zone, in which the reaction zone effluent stream contains an oligomer product effluent having at least 20 mass % octene(s), include a step of separating the reaction zone effluent stream into a first stream containing ethylene and less than 5 mass % C4+ olefins, a second stream containing butene(s) and less than 10 mass % C6+ olefins, a third stream containing at least 96 mass % hexene(s), and a fourth stream containing at least 96 mass % octene(s). The ethylene-rich first stream is recycled into the oligomerization reaction zone, while the recycle of 1-butene and other butenes is reduced significantly.
Claims20
A method for recycling ethylene from a reaction zone effluent stream from an oligomerization reaction zone, the reaction zone effluent stream containing an oligomer product effluent comprising at least 20 mass % octene(s), the method comprising:
- a) separating the reaction zone effluent stream into
- i) a first stream comprising ethylene and less than or equal to 5 mass % C4+ olefins,
- ii) a second stream comprising butene(s) and less than or equal to 10 mass % C6+ olefins,
- iii) a third stream comprising at least 96 mass % hexene(s), and
- iv) a fourth stream comprising at least 96 mass % octene(s);
- and
- b) recycling the first stream into the oligomerization reaction zone.
A process comprising:
- A) introducing ethylene, a catalyst system or catalyst system components, optionally, an organic reaction medium, and optionally, hydrogen, into an oligomerization reaction zone;
- B) forming an oligomer product effluent in the oligomerization reaction zone, the oligomer product effluent comprising at least 20 mass % octene(s);
- C) discharging a reaction zone effluent stream from the oligomerization reaction zone, the reaction zone effluent stream containing the oligomer product effluent stream;
- D) separating the reaction zone effluent stream into
- i) a first stream comprising ethylene and less than or equal to 5 mass % C4+ olefins,
- ii) a second stream comprising butene(s) and less than or equal to 10 mass % C6+ olefins,
- iii) a third stream comprising at least 96 mass % hexene(s), and
- iv) a fourth stream comprising at least 96 mass % octene(s);
- and
- E) recycling the first stream into the oligomerization reaction zone.
Dependencies are inferred from the claim text.