Process for producing hydrocarbon oil and system for producing hydrocarbon oil

Abstract

Hydrocarbon oil obtained by Fischer-Tropsch synthesis reaction using a slurry bed reactor holding a slurry of a liquid hydrocarbon in which a catalyst is suspended; the hydrocarbon oil is fractionated into a distilled oil and a column bottom oil containing the catalyst fine powder by a rectifying column; at least part of the column bottom oil is transferred to a storage tank, and the catalyst fine powder is sedimented to the bottom of the storage tank to capture the catalyst fine powder; a residue of the column bottom oil is transferred from the rectifying column to a hydrocracker, and/or the supernatant of the column bottom oil from which the catalyst fine powder is captured by the storage tank is transferred from the storage tank to the hydrocracker; and using the hydrocracker, the residue of the column bottom oil and/or the supernatant of the column bottom oil is hydrocracked.

What is claimed is: 
     
         1 . A system for producing a hydrocarbon oil, comprising:
 a Fischer-Tropsch synthesis reaction apparatus for obtaining a hydrocarbon oil containing a catalyst fine powder derived from a catalyst, the apparatus having a slurry bed reactor holding a slurry containing a liquid hydrocarbon and the catalyst suspended in the liquid hydrocarbon within the slurry bed reactor;   a rectifying column for fractionating the hydrocarbon oil into at least one distilled oil and a column bottom oil;   a hydrocracker for hydrocracking the column bottom oil;   a bypass line connecting a column bottom of the rectifying column to the hydrocracker;   a transfer line branched from a branching point of the bypass line; and   a storage tank that is connected to the transfer line, and in which the catalyst fine powder is sedimented to a bottom thereof to be captured.   
     
     
         2 . The system for producing a hydrocarbon oil according to  claim 1 , wherein the storage tank is configured to suppress movement of the catalyst fine powder sedimented to the bottom of the storage tank in the bottom of the storage tank.