Abstract: The 1.5 Mt/a resid DCC uint for ethylene and propylene production in Shaanxi Yanchang Coal Yulin Energy and Chemical Co., Ltd. adopts the design of DCC-plus reactor configuration. The design feedstock is atmospheric resid of Yanchang oilfield, and the main target products are ethylene and propylene. Since the unit was put into operation in 2014, the feedstock processing capacity and main operating conditions of the unit have been basically stable, and the iron content in the feed oil has fluctuated. Through technical breakthroughs such as operation optimization, unit revamping and catalyst improvement, the yield of ethylene and propylene has been steadily improved. During the calibration period, using the atmospheric resid of Yanchang oilfield as feedstock, the unit throughput was 100%, the ethylene yield was 13.82%, the propylene yield was 23.30%, the ethylene plus propylene yield reached 37.12%, and the unit operation could meet the design requirements.

Key words: resid, deep catalytic cracking, ethylene, propylene, iron poisoning