Diesel fuel or diesel fuel base stock and production method thereof

摘要

This process for manufacturing a diesel fuel base comprises: (A) a hydrogenation step that includes (A1) a hydroisomerization step of bringing an FT synthetic oil into contact with a hydro- isomerization catalyst to obtain a hydroisomerized oil (a1) and/ or (A2) a hydrocracking step of bringing an FT synthetic oil into contact with a hydrocracking catalyst to obtain a hydrocracked oil (a2); and (B) a rectification step of transferring at least a part of a hydrogenated oil (a) consisting of the hydroisomerized oil (a1) and/or the hydrocracked oil (a2) into a rectifying column to obtain, at least, an intermediate fraction (b1) which has a 5% distillation temperature of 130 to 170°C and a 95% distillation temperature of 240 to 300°C and a heavy oil (b2) which is heavier than the intermediate fraction (b1).