FCC process with secondary conversion zone

Details FCC process with secondary conversion zone FCC process with secondary conversion zone

1990-12-17

1993-01-05

Myers, Helane

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural parallel stages of chemical conversion

208113, 208148, 208151, 208153, 208155, 208164, 208163, C10G 5106

Patent

active

051768151

ABSTRACT:
An FCC process uses an open reactor vessel to house cyclones or other separation devices that reduce the carry though of product gases with the catalyst into the reactor vessel to less than 5 wt. % so that the catalyst in the reactor vessel can contact a secondary feedstock. By using a highly efficient separation device to remove product from the catalyst the environment in the reactor vessel receives a low volume of feed hydrocarbons and riser by-products. These by products comprise mainly C.sub.2 and lighter gases which are inert to a variety of other feedstreams. Possible secondary feedstreams include hydrotreated heavy naphtha, hydrotreated light cycle oil, light reformate and olefins. It is highly useful to use the secondary feedstream to heat the catalyst in the reactor vessel to facilitate hot stripping of the catalyst. Heat may be introduced in this manner by heating the secondary feedstream or using a feedstream that produces an exothermic reaction in the reactor vessel.

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