Fluidized catalytic cracking process

Abstract

The present invention relates to a fluidized catalytic cracking process for cracking hydrocarbon feed having organo-sulfur compound as an impurity, said process comprising: adding a heavy metal poisoned spent catalyst to an equilibrium catalyst to obtain a composite circulating catalyst, wherein the heavy metal poisoned spent catalyst is added in an amount to maintain the activity of the circulating catalyst; and obtaining a fluidized catalytic cracked product. The present invention further relates to fluidized catalytic cracked product obtained by the process of the present invention. The sulfur content of the fluidized catalytic cracked product mainly gasoline which is boiling in the range of C5-250° C. reduced by more than 20% (wt/wt). And Research Octane number of the fluidized catalytic cracked product is increased by more than 1 unit.

1 . A fluidized catalytic cracking process for cracking hydrocarbon feed having organo-sulfur compound as an impurity, said process comprising:
 adding a heavy metal poisoned spent catalyst to an equilibrium catalyst to obtain a composite circulating catalyst, wherein the heavy metal poisoned spent catalyst is added in an amount to maintain the activity of the circulating catalyst; and   obtaining a fluidized catalytic cracked product.   
     
     
         2 . The process as claimed in  claim 1 , wherein the hydrocarbon feed is selected from a group consisting of straight run hydrocarbon fractions and cracked hydrocarbon fractions or mixture thereof having carbon number 5 to 120 comprising at least one organo-sulfur compound. 
     
     
         3 . The process as claimed in  claim 1 , wherein the heavy metal poisoned spent catalyst comprises one or more heavy metals selected from Pt, V, Ni, Fe, Co or Mo. 
     
     
         4 . The process as claimed in  claim 1 , wherein the heavy metal poisoned spent catalyst has heavy metal concentration not less than 500 ppm. 
     
     
         5 . The process as claimed in  claim 1 , wherein the activity of the composite circulating catalyst is maintained by maintaining the vanadium concentration in the range of 550 ppm to 20,000 ppm. 
     
     
         6 . The process as claimed in  claim 1 , wherein the heavy metal concentration in the equilibrium catalyst is less than 20,000 ppm. 
     
     
         7 . The process as claimed in  claim 1 , said process comprising:
 adding a heavy metal poisoned spent catalyst to an equilibrium catalyst to obtain a composite circulating catalyst, wherein the heavy metal poisoned spent catalyst is added in an amount to maintain the activity of the circulating catalyst,   catalytically cracking a hydrocarbon feed in a reactor operating at catalytic cracking conditions with the circulating catalyst in a circulating inventory to obtain a reactor effluent,   separating the reactor effluent into a vapour rich phase containing fluidized catalytic cracked product and a solid rich phase containing coke laden catalyst, and   removing the vapour rich phase and fractionating the vapour rich phase to obtain fluidized catalytic cracked product.   
     
     
         8 . The process as claimed in  claim 7 , wherein the hydrocarbon feed is selected from a group consisting of straight run hydrocarbon fractions and cracked hydrocarbon fractions or mixture thereof having carbon number 5 to 120 comprising at least one organo-sulfur compound. 
     
     
         9 . The process as claimed in  claim 7 , wherein the heavy metal poisoned spent catalyst comprises one or more heavy metals selected from Pt, V, Ni, Fe, Co or Mo. 
     
     
         10 . The process as claimed in  claim 7 , wherein the heavy metal poisoned spent catalyst has heavy metal concentration not less than 500 ppm. 
     
     
         11 . The process as claimed in  claim 7 , wherein the activity of the composite circulating catalyst is maintained by maintaining the vanadium concentration in the range of 550 ppm to 20,000 ppm. 
     
     
         12 . The process as claimed in  claim 7 , wherein the heavy metal concentration in the equilibrium catalyst is less than 20,000 ppm. 
     
     
         13 . Fluidized catalytic cracked product obtained by a process as claimed in  claim 1  or  claim 7 . 
     
     
         14 . The product as claimed in  claim 13 , wherein sulfur content is reduced by more than 20% (wt/wt) when the cut point of the fluidized catalytic cracked product is C5-250° C. 
     
     
         15 . The product as claimed in  claim 13 , wherein Research Octane number is increased by more than 1 unit when the cut point of the fluidized catalytic cracked product is C5-250° C.