Method of hydrogenolysis of wax and process for producing fuel base

Abstract

The hydrocracking method of wax of the invention is a hydrocracking process wherein crude wax is subjected to hydrocracking and the untreated wax fraction that is produced after the hydrocracking is re-supplied for hydrocracking, and wherein hydrocracking of the mixture of the crude wax and untreated wax fraction is carried out in such a manner for a conversion ratio of 50-85% by mass from the wax fraction with a boiling point of 360° C. or above to the light fraction with a boiling point of below 360° C. in the presence of a hydrocracking catalyst. It is thereby possible to simultaneously achieve both an increased heart-cut fraction yield (as the product of the hydrocracking) and a reduced normal paraffin content in the heart-cut fraction when the untreated wax is hydrocracked by a bottom recycling system.

1 .- 6 . (canceled) 
     
     
         7 . A hydrocracking process wherein crude wax is subjected to hydrocracking and the untreated wax fraction that is produced after the hydrocracking is re-supplied for hydrocracking, and wherein hydrocracking of the crude wax and untreated wax fraction is carried out in the presence of a hydrocracking catalyst in such a manner that the conversion ratio is 50-85% by mass from the wax fraction with a boiling point of 3600 and above to the light fraction with a boiling point of below 360° C. 
     
     
         8 . The hydrocracking method according to  claim 7 , wherein the hydrocracking catalyst contains USY-zeolite and at least one solid acid selected from among silica-alumina, alumina-boria and silica-zirconia. 
     
     
         9 . The hydrocracking method according to  claim 8 , wherein the mean particle size of the USY-zeolite is no greater than 1.0 μm. 
     
     
         10 . The hydrocracking method according to  claim 8 , wherein the USY-zeolite content is no greater than 6% by mass based on the total weight of the hydrocracking catalyst. 
     
     
         11 . The hydrocracking method according to  claim 7 , wherein the reaction temperature for hydrocracking of the crude wax and untreated wax fraction is no higher than 370° C. 
     
     
         12 . A production method of a fuel base material comprising:
 subjecting crude wax to hydrocracking; and   resupplying for hydrocracking an untreated wax fraction that is produced after the crude wax hydrocracking;   wherein the hydrocracking of the crude wax and the untreated wax fraction is carried out in the presence of a hydrocracking catalyst, in such a manner that a conversion ratio is 50-85% by mass, from a wax fraction with a boiling point of 360° C. or above, to a light fraction with a boiling point of below 360° C.