DIESEL FUEL OR DIESEL FUEL BASE STOCK AND PRODUCTION METHOD THEREOF

摘要

Provided is a hydrotreating step (A) containing a hydroisomerization step (A1) that obtains a hydroisomerized oil (a1) by bringing a FT synthesis oil into contact with a hydroisomerization catalyst and/or a hydrocracking step (A2) that obtains a hydrocracked oil (a2) by bringing it into contact with a hydrocracking catalyst, and a fractionation step (B) that transfers at least a portion of the hydrotreated oil (a) composed of the hydroisomerized oil (a1) and/or the hydrocracked oil (a2) to a fractionator and, at the very least, obtains a middle distillate (b1) with a 5% distillation point of 130 to 170° C. and a 95% distillation point of 240 to 300° C., and a heavy oil (b2) that is heavier than the middle distillate (b1).

主权项

1. A production method for a diesel fuel or a diesel fuel base stock, comprising:
a hydrotreating step (A) containing a hydroisomerization step (A1) of obtaining a hydroisomerized oil (a1) by bringing a FT synthesis oil obtained by Fischer-Tropsch synthesis reaction, which contains a middle distillate and/or a wax fraction that is heavier than the middle distillate, into contact with a hydroisomerization catalyst, and/or a hydrocracking step (A2) of obtaining a hydrocracked oil (a2) by bringing it into contact with a hydrocracking catalyst; and a fractionation step (B) of transferring at least a portion of a hydrotreated oil (a) composed of the hydroisomerized oil (a1) and/or the hydrocracked oil (a2) to a fractionator and, at the very least, obtaining a middle distillate (b1) with a 5% distillation point of 130 to 170° C. and a 95% distillation point of 240 to 300° C., and a heavy oil (b2) that is heavier than the middle distillate (b1), wherein by adjusting the hydrotreating conditions in the hydrotreating step (A) and/or the fractionation conditions in the fractionation step (B), the middle distillate (b1), in which the flash point is 30 to 40° C., and the proportion of branched paraffins accounts for 60 mass % or more of the entire amount of paraffins, is obtained as a diesel fuel or a diesel fuel base stock.