By use of caustic washing electrofining method to decrease the acidity of straight run diesel oil,serious diesel oil emulsification problem can occure often.
Effective, rapid, non volatile, non conflagate, less insitation, recovery use, it is an ideal substitute of gasoline and diesel oil using for cleaning.
The quality of diesel oil producing was advanced by isomery pour point depression technique applying in hydrogenation unit in Harbin Petroleum Company Branch of PetroChina.