Process for the reduction of gasoline benzene content by alkylation with dilute ethylene
AssigneeUop LLC
InventorsChristopher P. Nicholas, Alakananda Bhattacharyya
Life of this patent
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Abstract
The process converts ethylene in a dilute ethylene stream and dilute benzene in an aromatic containing stream via alkylation to heavier hydrocarbons. The catalyst may be a zeolite such as UZM-8. The catalyst is resistant to feed impurities such as hydrogen sulfide, carbon oxides, and hydrogen and selectively converts benzene. At least 40 wt-% of the ethylene in the dilute ethylene stream and at least 20 wt-% of the benzene in the dilute benzene stream can be converted to heavier hydrocarbons.
Claims19
A process for alkylating benzene with ethylene comprising:
- providing a dilute ethylene stream comprising between about 5 and about 50 wt-% ethylene and between about 25 and about 55 wt-% methane;
- providing a benzene stream comprising at least about 3 wt-% toluene and at least about 20 wt-% paraffins, the benzene stream being a liquid benzene stream;
- contacting predominantly in the liquid phase the dilute ethylene stream further comprising at least about 1 wppm hydrogen sulfide and at least about 1 wppm ammonia and the liquid benzene stream with an alkylation catalyst comprising UZM-8;
- and
- converting at least 20% of the benzene in the liquid benzene stream to alkylbenzene wherein the conversion of benzene is at least 90% of the conversion of toluene.
A process for alkylating benzene with ethylene comprising:
- contacting cracking catalyst with a hydrocarbon feed stream to crack 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, between about 0.05 wt-% and about 5.0 wt-% carbon monoxide and between about 25 and about 55 wt-% methane;
- providing a benzene stream comprising at least about 3 wt-% toluene and at least about 20 wt-% paraffins;
- contacting predominantly in the liquid phase the dilute ethylene stream and the benzene stream with an alkylation catalyst comprising UZM-8;
- and
- converting at least 20% of the benzene in the benzene stream to alkylbenzene.
A process for alkylating benzene with ethylene comprising:
- providing a dilute ethylene stream comprising between about 5 and about 50 wt-% ethylene, between about 0.05 wt-% and about 5.0 wt-% carbon monoxide and between about 25 and about 55 wt-% methane;
- contacting a naphtha stream with a reforming catalyst to provide a reformate benzene stream comprising at least about 3 wt-% toluene and at least about 20 wt-% paraffins;
- contacting predominantly in the liquid phase the dilute ethylene stream and the benzene stream with an alkylation catalyst comprising UZM-8, the benzene stream being a liquid benzene stream;
- and
- converting at least 20% of the benzene in the liquid benzene stream to alkylbenzene.
Dependencies are inferred from the claim text.