PRACTICE OF 4.0 Mt/a HYDROCRACKER FOR INCREASING HEAVY NAPHTHA PRODUCTION USING NAPHTHENE-BASE FEED
;The 4.0 Mt/a hydrocracker of CNOOC Huizhou Petrochemical Company Limited was modified by using RN-410C/RHC-210/RHC-220 graded catalysts and fractionation system revamping to upgrade the production of high-quality chemical feedstocks.The calibration results show that using the VGO feedstock,blended with 20.16％of CGO,with the nitrogen mass fraction of 0.184 6％and a density(20 ℃)of 0.910 g/cm3,under the conditions of an inlet pressure of 15.18 MPa,an average hydrotreating temperature of 385.6 ℃ and average hydrocracking temperature of 389.3 ℃,the hydrogen consumption is 2.98％,heavy naphtha yield is 35.23％,and tail oil yield is 10.69％.The naphtha,jet fuel,and diesel products can meet the specification requirements.The smoke point of jet fuel can reach 30 mm,the cetane index of diesel with 1％of polycyclic aromatics,can reach 72.3,and the BMCI value of tail oil is 12.The energy consumption of the unit is 21.91 kgEO/t(1 kgOE=41.8 MJ),reaching the advanced level of similar units.The selectivity of heavy naphtha increased from 77.3％in the previous cycle to 84.2％in this cycle,indicating a significant effect of catalyst gradation and reaction zone regulation.
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