The H-OilRC (RC stands for Resid Cracking) process uses ebullated-bed hydrocracking technology to process heavy feedstock residues (Atmospheric and Vacuum Residue) with high metals, sulfur, nitrogen, asphaltenes and solid contents.
Fresh catalyst is continuously added and spent catalyst withdrawn to control the level of catalyst activity in the reactor enabling constant yields and product quality over time. There is no run-length constraint as the catalyst is added on-line.
Where conventional fixed-bed residue hydrotreaters are limited to catalyst cycle lengths, the H-OilRC process can achieve the two- to four-year turnaround cycles to match that of the FCC unit and requires only one or two reactors.
Alternatively, operating conditions can be varied to achieve a range of conversion and product quality to meet seasonal demands or changes in the crude slate.
The continuous development of this technology over the past 50 years, with one of the first unit started up in 1968 and still in operation today, offers several advantages:
- Conversion ranging from 50 to 85% depending on the feedstock
- Improvement of the technology: much higher reliability and increased unit availability (above 96% in 2009 based on four H-Oil reference units)
- Optimization of the process scheme: integration of IS2 (inter-stage separator) between reactors in series and the application of C2U (cascade catalyst utilization) for higher performance and lower operating costs.
- Development of dedicated catalyst: high conversion, low sediment ebullated bed catalyst tailored to handle the ebullition and provide high performances
- Higher stability: Understanding and control of phenomena occurring at high conversion
The H-Oil ebullated bed conversion technology is commercially proven with nine commercially operating ebullated-bed reactor units.
Through this industrial experience, the process has been improved and is today a reference where a high level of conversion of the atmospheric and vacuum residue fraction is an objective.
First Residue Hydrocracker starts-up in Asia Pacific