Abstract: This article summarizes and analyzes the latest practice of using HMIP catalyst to increase the production of light olefins in a 3 Mt/a MIP unit using hydrotreated VGO as feed in a petrochemical company. The calibration results during operation indicate that the unit has not experienced any abnormal catalyst fluidization problems, and the unit is running normally. During the calibration period, the blending ratio of redidue was 25% to 35%, the average catalyst consumption was 0.725kg/t (based on raw materials), the yield of (LPG+gasoline+diesel) reached 87.37%, the volume fraction of olefins in stablized gasoline was 25%, the RON of stablized gasoline was 94.0, and the volume fraction of isobutane in LPG was 18.5%, all of which exceeded the technical agreement requirements. Compared with the former catalysts, the yield of LPG and propylene increased significantly, with sunstantial economic benefits. The application results of this HMIP catalyst provide an example for increasing the production of light olefins such as propylene, butene, and pentene in hydrotreated VGO catalytic cracking units.

Key words: HMIP catalyst, hydrotreated gas oil, light olefin, gasoline olefin, isobutane, propylene