Abstract: To further improve the octane number of gasoline and reduce hydrogen consumption, the second generation LTAG (LTAG-Ⅱ) technology was implemented on 3.50 Mt/a FCCU and 3.90 Mt/a RDS unit in SINOPEC Shanghai Petrochemical Company Limited. The calibration results of industrial application shows that the apparent conversion of light fraction from vacuum tower cutting LCO into light and heavy fractions and heavy fraction after hydrocracking is 74.12%. The gasoline and LPG selectivity reached about 88%. Compared with blank calibration, the yields of gasoline and LPG increased by 1.47 percentage points and 3.37 percentage points, respectively with 5.50 percentage points reduction of LCO yield in FCCU. Compared with the first generation LTAG technology of LCO full fraction hydrotreating, RON and MON of the stable gasoline increased by 0.6 and 0.7 units respectively. Hydrogen consumption rate of LCO hydrogenation reduced by 22.70%. LTAG-Ⅱ has significant economic benefits.

Key words: LTAG, catalytic cracking, hydrogen consumption, octane number, aromatics