Patent ID: 6656344
Filing Date: 2003-12-02
Classification: C10G

Abstract:
A fluidized catalytic cracking process for converting a feedstock comprising impurities and heavy vacuum gas oil and residual oil fractions into lighter products, the process comprising, in the order recited:contacting said feedstock with an adsorbent in a bottom portion of a riser so that at least the impurities are adsorbed by the adsorbent wherein the adsorbent has a particle size ranging from 200 to 500 micrometers, and wherein the adsorbent has a particle density ranging from 1500 to 3000 kg/m3); contacting the feedstock and the adsorbent with a catalyst wherein the particles of catalyst have a particle size ranging from 20 to 200 micrometers and a particle density ranging from 1200 to 1800 kg/m3, under fluidized catalytic cracking conditions, to produce a product mixture comprising product hydrocarbons, adsorbent and spent catalyst; separating a mixture of the spent catalyst and the adsorbent from the product hydrocarbons in a stripper; introducing the mixture of the spent catalyst and the adsorbent into a separator, and separating the spent catalyst from the adsorbent in the presence of steam and at a temperature ranging from 450 to 600Â° C. to provide spent adsorbent; introducing the spent adsorbent from the separator into a burner and firing the spent adsorbent under conditions effective to activate the adsorbent and provide activated adsorbent; introducing the spent catalyst from the separator into a regenerator to provide activated catalyst; and recycling the activated adsorbent and the activated catalyst into the riser.