CPC C10G 51/04 (2013.01) [C10G 2400/20 (2013.01); C10G 2400/22 (2013.01); C10G 2400/30 (2013.01)] | 16 Claims |
1. A method of producing olefins, aromatics, or combinations thereof, the method comprising:
(a) separating a feed stream comprising full range naphtha having an initial boiling point of 20° C. and a final boiling point of 250° C. to form a first intermediate stream comprising C6 and C6+ hydrocarbons and a heavies stream comprising only C12+ hydrocarbons;
(b) contacting the first intermediate stream with a catalyst under catalytic cracking conditions sufficient to cause cracking of hydrocarbons in the first intermediate stream to form an effluent stream comprising C2 to C12 hydrocarbons;
(c) separating the effluent stream to produce a light intermediate stream comprising C5− hydrocarbons, and a heavy intermediate stream comprising C5+ hydrocarbons; and
(d) subjecting at least a portion of the light intermediate stream of step (c) comprising C5− hydrocarbons to steam cracking conditions sufficient to convert hydrocarbons in the light intermediate stream to olefins, and producing a product stream comprising one or more of ethylene, propylene, butene, benzene, toluene, and xylene;
(e) cooling the effluent stream from step (b) and providing the cooled effluent stream to step (c);
wherein cooling the effluent stream from step (b) produces a light hydrocarbons stream, and combusting the light hydrocarbon stream to generate heat for the catalytic cracking of step (b);
wherein separating the effluent stream or the product stream comprises compressing the effluent stream or the product stream to produce a compressed intermediate stream or a compressed second light intermediate stream, and the heavy intermediate stream or second heavy intermediate stream;
wherein the steam cracking conditions comprise a temperature of 800 to 900° C.; and
wherein the catalytic cracking conditions comprise a temperature of 600 to 750° C., a pressure of 1.5 to 2.5 bara, and a residence time of 1 to 10 seconds.
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