Abstract: KHP additive produced by a domestic company was an additive to enhance propylene yield in FCC process. The application of KHP propylene additive was carried out in a 3.5 Mt/a RFCC unit of PetroChina Guangxi Petrochemical Company. Test results showed that when the amount of KHP additive in the total catalyst inventory reached 5.8 %, the yields of propylene and LPG increased 1.66 and 3.08 percentage points, respectively; meanwhile, the yields of gasoline and LCO dropped 1.75 and 1.53 percentage points, respectively. The overall light products yield remained basically unchanged. The RON of gasoline increased by 0.5 units with no significant changes observed in other gasoline properties. KHP high-efficiency propylene additive demonstrated good compatibility with the primary catalyst LDO-75 during the test.

Key words: additive, propylene, catalytic cracking