Patent ID: 6558530
Filing Date: 2003-05-06
Classification: C10G

Abstract:
A process for fluid catalytic cracking with a pre-vaporized hydrocarbon feed which is to be contacted with a hot regenerated catalyst in a FCC unit, in the absence of added hydrogen, the process comprising the following steps:pre-vaporizing the hydrocarbon feed under the required temperature and pressure conditions to promote the optimized vaporization of the feed prior to the contact with the hot regenerated catalyst; in a reaction zone, contacting the pre-vaporized hydrocarbon feed with the catalyst stream from a regenerator, so as to promote the catalytic cracking reaction in the vapor phase, whereby is obtained a mixture of cracked hydrocarbons and spent catalyst; separating from the so-obtained mixture the stream of spent catalyst, and a stream of cracked hydrocarbon products; directing the spent separated catalyst which has been separated in the previous step to a stripping zone, then to a regeneration zone and effecting the combustion of the coke deposited on the catalyst particles, so as to obtain particles of regenerated catalyst having a higher activity than the activity of the spent catalyst; directing the stream of cracked hydrocarbons to a separation and fractionation zone, so as to separate the various hydrocarbon products obtained according to their boiling point; and directing the stream of regenerated catalyst back to the reaction zone so as to continue the fluid catalytic cracking process; wherein the absolute temperature difference between the temperature at the end of the reaction zone and the temperature of the pre-vaporized feed is 200Â° C. or less.