RFCC Process with Maximized Diesel Yields

Abstract

The present invention relates to a RFCC process. More specifically, the present invention relates to a RFCC process with maximized diesel yield which includes catalytically reacting a catalytic cracking catalyst in which zeolite has been selectively removed, with a petroleum feedstock in a reaction zone of a fluidized bed catalytic cracking unit to thereby obtain a product stream, an unreacted petroleum feedstock and a mixture of the used catalysts, and separating and collecting the product stream from the used catalyst and the unreacted petroleum feedstock.

What is claimed is: 
     
         1 . A RFCC process with maximized diesel yield which comprises catalytically reacting a catalytic cracking catalyst in which zeolite has been selectively removed, with a petroleum feedstock in a reaction zone of fluidized bed catalytic cracking unit to thereby obtain a product stream, an unreacted petroleum feedstock and a mixture of the used catalysts, and separating and collecting the product stream from the used catalyst and the unreacted petroleum feedstock. 
     
     
         2 . The RFCC process with maximized diesel yield according to  claim 1 , wherein the catalytic cracking catalyst in which zeolite has been selectively removed has pores in which those with a diameter greater than 20 Å make up more than 80% by volume of the total probe count of the catalyst, and the ratio (Z/M) of a specific surface area of zeolite and a specific surface area of matrix is 0.2 or less. 
     
     
         3 . The RFCC process with maximized diesel yield according to  claim 1 , wherein the catalytic cracking catalyst in which zeolite has been selectively removed was subjected to steam treatment under hot water conditions of greater than 20 bar and greater than 250° C. and so the content of zeolite in the catalyst is controlled to less than 20% by weight. 
     
     
         4 . The RFCC process with maximized diesel yield according to  claim 1 , wherein the catalytic cracking catalyst in which zeolite has been selectively removed further comprises one or more selected from the group consisting of nickel and cobalt. 
     
     
         5 . The RFCC process with maximized diesel yield according to  claim 1 , wherein the petroleum feedstock is a heavy residual oil which undergoes fractional distillation of the raw oil. 
     
     
         6 . The RFCC process with maximized diesel yield according to  claim 1 , wherein the temperature in the reaction zone of the fluidized bed catalytic cracking unit ranges from 503 to 593° C.