CPC C10G 61/10 (2013.01) [C10G 9/36 (2013.01); C10G 11/05 (2013.01); C10G 11/187 (2013.01); C10G 35/24 (2013.01); C10G 45/02 (2013.01); C10G 55/06 (2013.01); C10G 2300/1044 (2013.01); C10G 2300/1055 (2013.01); C10G 2300/202 (2013.01); C10G 2300/4006 (2013.01); C10G 2300/4018 (2013.01); C10G 2300/4025 (2013.01); C10G 2300/70 (2013.01); C10G 2400/02 (2013.01); C10G 2400/06 (2013.01); C10G 2400/20 (2013.01); C10G 2400/30 (2013.01)] | 11 Claims |
1. A process for converting diesel to products comprising light olefins, benzene-toluene-xylenes (BTX), fluid catalytically cracked naphtha, pyrolysis gasoline, and pyrolysis fuel oil, said process comprising:
introducing a diesel feedstream to a diesel hydrodesulfurization unit to produce a desulfurized diesel stream;
introducing the desulfurized diesel stream to a fluid catalytic cracking (FCC) unit to produce the fluid catalytically cracked naphtha, a light gas stream, and a cycle oils stream;
introducing a heavy naphtha stream to a naphtha hydrodesulfurization unit to produce a desulfurized naphtha stream;
introducing the desulfurized naphtha stream to a naphtha splitter unit to produce a desulfurized heavy naphtha stream comprising C7-C11 hydrocarbons and a desulfurized light naphtha stream comprising C5-C6 hydrocarbons;
passing the desulfurized heavy naphtha stream directly from the naphtha splitter unit to a catalytic reforming unit to produce a reformate stream;
combining the reformate stream with the fluid catalytically cracked naphtha stream to produce a combined stream;
introducing the combined stream to an aromatic recovery complex to produce the BTX and an aromatic bottoms stream; and
introducing the desulfurized light naphtha stream and a paraffinic fraction of the light gas stream to a steam cracking unit to produce a light olefins stream, the pyrolysis gasoline, and the pyrolysis fuel oil,
wherein:
the FCC unit is operated at a residence time from 0.1 seconds to 30 seconds, and
the FCC unit comprises a zeolite containing catalyst comprising from 5 wt. % to 15 wt. % of a catalyst additive to provide a higher concentration of propylene relative to the concentration of propylene provided in the absence of the catalyst additive.
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