Crude treatment system

Abstract

[Task] To provide a crude treatment system which treats crude containing a comparatively large content of nickel, vanadium, or carbon residue so as to supply a raw material to a downstream catalytic cracking process. [Means for Resolution] A primary distillation tower 11 fractionates first crude into a residue fraction partly used as raw oil of a catalytic cracking process and other fractions. A secondary distillation tower 21 fractionates second crude containing a larger content of a catalytic poison with respect to catalysts used in the catalytic cracking process than the first crude into a light fraction included in a distillation temperature range of the other fractions and a heavy fraction as a rest thereof. A light fraction supply line supplies the light fraction to the primary distillation tower 11 so as to be treated in the primary distillation tower 11.

1 . A crude treatment system comprising:
 a primary distillation tower which fractionates first crude supplied from a first crude supply line into a residue fraction partly or entirely used as raw oil of a catalytic cracking process and other fractions;   a secondary distillation tower which fractionates second crude supplied from a second crude supply line and containing a larger content of a catalytic poison with respect to catalysts used in the catalytic cracking process than the first crude into a light fraction included in a distillation temperature range of the other fractions and a heavy fraction as a rest thereof; and   a light fraction supply line which supplies the light fraction to the primary distillation tower so as to be treated.   
     
     
         2 . A crude treatment system comprising:
 a primary distillation tower which fractionates first crude supplied from a first crude supply line into a residue fraction partly or entirely used as raw oil of a catalytic cracking process and other fractions;   a secondary distillation tower which fractionates second crude supplied from a second crude supply line and containing a larger content of a catalytic poison with respect to catalysts used in the catalytic cracking process than the first crude into a light fraction having a content of the poison equal to or less than a predetermined value and a heavy fraction as a rest thereof; and   a light fraction supply line which supplies the light fraction to the primary distillation tower so as to be treated.   
     
     
         3 . The crude treatment system according to  claim 1 , further comprising:
 a vacuum distillation tower which distills the heavy fraction in a vacuum condition so as to obtain a vacuum gas oil fraction used as raw oil of the catalytic cracking process and other vacuum residue fractions; and   a heavy fraction supply line which supplies the heavy fraction from the secondary distillation tower to the vacuum distillation tower so as to be treated.   
     
     
         4 . The crude treatment system according to  claim 3 , further comprising:
 a residue fraction supply line which supplies the residue fractions to the vacuum distillation tower so as to be treated.   
     
     
         5 . The crude treatment system according to  claim 3 ,
 wherein the residue fraction fractionated from the primary distillation tower is mixed with the vacuum gas oil fraction fractionated from the vacuum distillation tower so as to be used as raw oil of the catalytic cracking process.   
     
     
         6 . The crude treatment system according to  claim 1 ,
 wherein the catalytic poison is selected from a catalytic poison group consisted of nickel, vanadium, or carbon residue.   
     
     
         7 . The crude treatment system according to  claim 1 ,
 wherein the second crude includes crude selected from a crude group consisted of Mayan crude, Orinoco tar, and oil sand/bitumen.   
     
     
         8 . The crude treatment system according to  claim 2 , further comprising:
 a vacuum distillation tower which distills the heavy fraction in a vacuum condition so as to obtain a vacuum gas oil fraction used as raw oil of the catalytic cracking process and other vacuum residue fractions; and   a heavy fraction supply line which supplies the heavy fraction from the secondary distillation tower to the vacuum distillation tower so as to be treated.   
     
     
         9 . The crude treatment system according to  claim 8 , further comprising:
 a residue fraction supply line which supplies the residue fractions to the vacuum distillation tower so as to be treated.   
     
     
         10 . The crude treatment system according to  claim 8 ,
 wherein the residue fraction fractionated from the primary distillation tower is mixed with the vacuum gas oil fraction fractionated from the vacuum distillation tower so as to be used as raw oil of the catalytic cracking process.   
     
     
         11 . The crude treatment system according to  claim 2 ,
 wherein the catalytic poison is selected from a catalytic poison group consisted of nickel, vanadium, or carbon residue.   
     
     
         12 . The crude treatment system according to  claim 2 ,
 wherein the second crude includes crude selected from a crude group consisted of Mayan crude, Orinoco tar, and oil sand/bitumen.