Patent ID: 6099720
Filing Date: 2000-08-08
Classification: C10G

Abstract:
A process for fluidized bed catalytic cracking of a petroleum feed to lighter effluents in a catalytic cracking zone comprising:introducing regenerated catalyst from at least one regeneration zone (4) into an injection zone (10) in the upper end of a reaction zone (13);shaping the catalyst by means of a shaping means (11) forming a constriction;bringing the catalyst into contact with liquid feed within said injection zone (10) and forming a downward flowing mixture of catalyst and feed;vaporizing at least the majority of the feed in said injection zone (10);cracking said feed in said reaction zone (13) to obtain lighter effluents;separating said effluents from the used catalyst in a separation zone (14) at the lower end of said reaction zone (13); and recovering the effluents and recycling the used catalyst to said regeneration zone (4);wherein regenerated catalyst from said regeneration zone (4) is caused to flow in a dense fluidized bed catalyst conditioning zone (2), in which the fluidization rate by a fluidization gas is 0.1 to 30 cm/s upstream of said injection zone (10), said conditioning zone (2) comprising a gas disengagement zone (8);wherein the throughput of catalyst flowing under gravity into said injection zone (10) is regulated, andwherein said feed is injected into said injection zone (10) below said catalyst shaping means (11), in a direction which is counter-current to the flow of catalyst, the feed injection angle being determined so that the resultant of the vectors of the linear momentum of the feed and the linear momentum of the catalyst is substantially horizontal.