Method for dewaxing hydrocarbon oil and method for producing lubricating-oil base oil

Abstract

There is provided a method for dewaxing a hydrocarbon oil for improving the life of a hydroisomerization catalyst. An aspect of a method for dewaxing a hydrocarbon oil according to the present invention comprises: a first step of subjecting a hydrocarbon oil in which a peroxide value is 100 ppm by mass or more to hydrotreating to obtain a material to be treated in which a peroxide value is 30 ppm by mass or less; and a second step of subjecting the material to be treated in which a peroxide value is 30 ppm by mass or less to hydroisomerization treatment using a hydroisomerization catalyst.

1 . A method for dewaxing a hydrocarbon oil comprising:
 a first step of subjecting a hydrocarbon oil in which a peroxide value is 100 ppm by mass or more to hydrotreating to obtain a material to be treated in which a peroxide value is 30 ppm by mass or less; and   a second step of subjecting the material to be treated in which a peroxide value is 30 ppm by mass or less to hydroisomerization treatment using a hydroisomerization catalyst.   
     
     
         2 . The method for dewaxing a hydrocarbon oil according to  claim 1 , wherein the hydrocarbon oil is synthesized by a Fischer-Tropsch reaction. 
     
     
         3 . The method for dewaxing a hydrocarbon oil according to  claim 1 , wherein the hydroisomerization catalyst contains zeolite; and
 the zeolite contains an organic template, and has a one-dimensional porous structure including a 10-membered ring.   
     
     
         4 . The method for dewaxing a hydrocarbon oil according to  claim 3 , wherein the zeolite is at least one selected from the group consisting of zeolite ZSM-22, zeolite ZSM-23, zeolite SSZ-32, and zeolite ZSM-48. 
     
     
         5 . The method for dewaxing a hydrocarbon oil according to  claim 1 , wherein the material to be treated contains normal paraffins having 10 or more of carbon number; and
 the material to be treated is contacted with the hydroisomerization catalyst in the presence of hydrogen in the second step.   
     
     
         6 . A method for producing a lubricant base oil using the method according to  claim 1 . 
     
     
         7 . The method for producing a lubricant base oil according to  claim 6 , further comprising a step of subjecting the material to be treated after the hydroisomerization treatment to hydrofinishing. 
     
     
         8 . The method for producing a lubricant base oil according to  claim 7 , further comprising a step of subjecting the material to be treated after the hydrofinishing to vacuum distillation.