Process for Producing Hydrorefined Gas Oil, Hydrorefined Gas Oil, and Gas Oil Composition

Abstract

A process of the present invention for producing a hydrotreated gas oil has a step for obtaining a product oil having a total aromatic content of 3% by volume or less by hydrogenating a hydrotreated oil including 95% by volume or more of fraction having a boiling point range of 150-380° C., a sulfur content of 2-15 ppm by mass, a total aromatic content of 10-25% by volume, and a naphthene of 20-60% by volume in the presence of a hydrogenation catalyst; and a step for obtaining, by hydrogenating the above-described product oil in the presence of a hydrogenation catalyst containing a crystalline molecular sieve component, a product oil satisfying the conditions that the content of petroleum fraction having a boiling point range of lower than 150° C. is 16% by volume or less, and the sum of the total aromatic content and the total naphthene content is 80% or less relative to the sum of these in the hydrotreated oil.

1 . A process for producing a hydrotreated gas oil by carrying out hydrotreating of a feed oil, comprising:
 a first step for obtaining a first product oil having a total aromatic content of 3% by volume or less, by using a hydrotreated oil including a petroleum fraction of 95% by volume or more having a boiling point range of 150-380° C., a sulfur content of 2-15 ppm by mass, a total aromatic content of 10-25% by volume and a total naphthene content of 20-60% by volume as a feed oil, and by carrying out hydrotreating of the feed oil in the presence of a first hydrogenation catalyst; and   a second step for obtaining a second product oil that satisfies the following conditions (1) and (2) by carrying out hydrotreating of the first product oil in the presence of a second hydrogenation catalyst containing a crystalline molecular sieve component,   (1) the content of petroleum fraction having a boiling point range of lower than 150° C. is 16% by volume or less, and   (2) the sum of the total aromatic content and the total naphthene content is 80% or less relative to the sum of the total aromatic content and the total naphthene content in the feed oil.   
   
   
       2 . A process for producing a hydrotreated gas oil according to  claim 1 , wherein a polycyclic aromatic content in the feed oil is 1-7% by volume, and a polycyclic aromatic content in the second product oil is 0.2% by volume of less. 
   
   
       3 . A process for producing a hydrotreated gas oil according to  claim 1 , wherein the sum of a polycyclic aromatic content and a polycyclic naphthene content in the second product oil is 13% by volume or less. 
   
   
       4 . A process for producing a hydrotreated gas oil according to  claim 1 , wherein:
 in the first step, the feed oil is subjecting to hydrotreating under such reaction conditions as a reaction temperature of 170-320° C., a hydrogen partial pressure of 2-10 MPa, a liquid hourly space velocity of 0.1-4 h −1  and a hydrogen/oil ratio of 250-800 NL/L; and   in the second step, the first product oil is subjected to hydrotreating under such reaction conditions as a reaction temperature of 200-280° C., a hydrogen partial pressure of 2-10 MPa, a liquid hourly space velocity of 0.1-2 h −1  and a hydrogen/oil ratio of 250-800 NL/L.   
   
   
       5 . A process for producing a hydrotreated gas oil according to  claim 1 , wherein both the first hydrogenation catalyst and the second hydrogenation catalyst are composed of an active metal supported on a porous support, and the active metal is at least one kind of metal selected from the group consisting of group VIII metals. 
   
   
       6 . A process for producing a hydrotreated gas oil according to  claim 5 , wherein the active metal is at least one kind of metal selected from the group consisting of Rh, Ir, Pd and Pt. 
   
   
       7 . A process for producing a hydrotreated gas oil according to  claim 1 , wherein the support in the first hydrogenation catalyst contains at least one kind of metal oxide selected from the group consisting of titania, zirconia, boria and silica, and alumina. 
   
   
       8 . A process for producing a hydrotreated gas oil according to  claim 1 , wherein the crystalline molecular sieve component contains silica and alumina, and has at least one kind of crystal structure selected from the group consisting of a faujasite type, a beta type, a mordenite type and a pentacyl type. 
   
   
       9 . A hydrotreated gas oil that is obtained by the process for producing the hydrotreated gas oil as described in  claim 1 , and that has a sulfur content of 1 ppm by mass or less and a total aromatic content of 3% by volume or less. 
   
   
       10 . A gas oil composition comprising a hydrotreated gas oil that is obtained by the process for producing the hydrotreated gas oil as described in  claim 1 , and that has a sulfur content of 1 ppm by mass or less and a total aromatic content of 3% by volume.