THE FIRST APPLICATION OF PHD-112/PHU-301 GRADED CATALYST IN THE PRODUCTION OF CHINA Ⅵ LOW POUR POINT DIESEL
In order to flexibly adjust the ratio of diesel to gasoline and produce low pour point diesel while taking into account the high production of naphtha in winter,a new generation hydrofining catalyst PHD-112 and a hydrocracking catalyst PHU-301,developed by PetroChina Petrochemical Research Institute,were used to produce low pour point diesel in accordance with the Standard of China Ⅵ in Refining and Chemical Complex of Yumen Oilfield,PetroChina.After stable operation of the unit for 3 months,calibration work was carried out.The results showed that after the mixture of FCC diesel,coker gasoline,and straight-run diesel was treated with graded PHD-112/PHU-301 catalysts,the sulfur content,nitrogen content and polycyclic aromatic hydrocarbon content of feed oil decreased from 4 260 μg/g to 3.6 μg/g,from 96 μg/g to 0.32 μg/g,and from 18.9％to 6.2％respectively,the hexadecane index increased by 1.6,the condensation point decreased to-28℃,and the cold filter point decreased to-20 ℃.At the same time,naphtha yield increased by about 10 percentage points(relative to feed amount),which showed that PHD-112/PHU-301 catalyst had good performance in desulfurization,denitrification,pour point depression and naphtha production.It could meet the production of low pour point diesel with China Ⅵ through diesel hydrotreating unit.
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