FCC process with short primary contacting and controlled seconda

Details FCC process with short primary contacting and controlled seconda FCC process with short primary contacting and controlled seconda

1997-12-05

1999-10-12

Griffin, Walter D.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

20812001, 585653, C10G 1118

Patent

active

059650125

ABSTRACT:
An FCC process combines ultra short catalyst and feed contacting with the blending of spent and regenerated catalyst in a disengaging vessel that recovers a primary product and passes the separated catalyst to a riser for controlled cracking of the adsorbed heavier hydrocarbons. The disengaging vessel is used as a separation zone to quickly withdraw lighter products that are initially cracked and the riser is used for the remaining hydrocarbons as a controlled secondary cracking section to further convert heavier feed components that are not quickly displaced from the catalyst in the blending/disengaging vessel zone. A separate feed may be added riser downstream of the blending disengaging vessel for cracking of secondary feeds. The arrangement provides a great deal of flexibility in the operation of ultra short catalyst contact systems.

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