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US 8,748,682 B2Granted
Process for oligomerizing dilute ethylene
AssigneeUop LLC
InventorsChristopher P. Nicholas, Alakananda Bhattacharyya, David E. Mackowiak
Life of this patent
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Abstract
The process and apparatus converts ethylene in a dilute ethylene stream that may be derived from an FCC product to heavier hydrocarbons. The catalyst may be an amorphous silica-alumina base with a Group VIII and/or VIB metal. The catalyst is resistant to feed impurities such as hydrogen sulfide, carbon oxides, hydrogen and ammonia. At least 40 wt-% of the ethylene in the dilute ethylene stream can be converted to heavier hydrocarbons.
Claims20
A process comprising:
- contacting cracking catalyst with a hydrocarbon feed stream to crack the hydrocarbons to cracked product hydrocarbons having lower molecular weight and deposit coke on the cracking catalyst to provide coked cracking catalyst;
- separating said coked cracking catalyst from said cracked products;
- adding oxygen to said coked cracking catalyst;
- combusting coke on said coked cracking catalyst with oxygen to regenerate said cracking catalyst;
- separating said cracked products to obtain a dilute ethylene stream comprising between about 5 and about 50 wt-% ethylene and between about 25 and about 55 wt-% methane;
- compressing the dilute ethylene stream to a pressure of between about 4,826 and about 7,584 kPa;
- and
- contacting the dilute ethylene stream with an oligomerization catalyst.
5 more elements
A process comprising:
- contacting cracking catalyst with a hydrocarbon feed stream to crack the hydrocarbons to cracked product hydrocarbons having lower molecular weight and deposit coke on the cracking catalyst to provide coked cracking catalyst;
- separating said coked cracking catalyst from said cracked products;
- adding oxygen to said coked cracking catalyst;
- combusting coke on said coked cracking catalyst with oxygen to regenerate said cracking catalyst;
- separating said cracked products to obtain a dilute ethylene stream comprising between about 25 and about 55 wt-% methane, between about 5 and about 50 wt-% ethylene and no more than about 0.5 wt-% propylene;
- contacting the dilute ethylene stream with an oligomerization catalyst comprising an amorphous silica-alumina base and a metal selected from the group consisting of Group VIII and Group VIB in the periodic table;
- and
- converting at least 40 wt-% of the ethylene in the dilute ethylene stream to heavier hydrocarbons.
5 more elements
Dependencies are inferred from the claim text.