Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1983-07-25
1988-10-25
Chaudhuri, Olik
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208253, 502 43, 502 44, C10G 1105, C10G 1118, B01J 2120, B01J 2938
Patent
active
047801956
ABSTRACT:
The invention is particularly concerned with controlling the two stage regeneration temperatures of the RCC residual oil cracking unit below 760.degree. C. (1400.degree. F.) by effecting a first stage regeneration with direct injection of water in an oxygen lean atmosphere to product CO rich flue gases under temperature conditions restricted not to substantially exceed 732.degree. C. (1350.degree. F.) preferably less than 732.degree. C. (1350.degree. F.) thereby partially regenerating the catalyst. The partially regenerated catalyst is withdrawn and directly cooled with boiler feed water to produce steam in an external catalyst cooler before passing the catalyst to a second stage catalyst regeneration for contact with an oxygen rich atmosphere restricted not to exceed 760.degree. C. (1400.degree. F.) and preferably maintain less than 760.degree. C. (1400.degree. F.). The catalyst regenerated by this technique comprising residual coke less than 0.25 wt % is passed to a riser conversion zone for catalytic cracking residual oil feeds.
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Ashland Oil Inc.
Chaudhuri Olik
Willson, Jr. Richard C.
Wilson James L.
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