Abstract: In order to adjust the product structure, reduce the diesel/gasoline ratio, diversify steam cracking feedstock, and increase the economic benefits, the straight-run diesel hydroupgrading process to maximize the steam cracking feedstock was developed by SINOPEC Research Institute of Petroleum Processing (RIPP). The results showed that the diesel fraction produced by the developed hydroupgrading process with the proprietary catalyst developed by RIPP possessed high paraffin content and low aromatics content and was a good feedstock for steam cracking process. The industrial application demonstrated that the diesel fraction produced had a yield higher than 90% and contained more than 55% of paraffin, and could be stably produced for long-term. The developed technology provides a solid technical support for refineries to adjust the product structure and transform to chemical industry.

Key words: straight-run diesel, steam cracking feedstock, ethylene, hydroupgrading, diesel to gasoline ratio