Shell Oil Comapny

Wouter C Van Zijll Langhout

Abraham A Pegels

Joannes B Wijffels

A hydroconversion process for heavy hydrocarbon oil and reactor system having a series of closed reactor vessels containing substantially fixed catalyst beds in flow communication with each of one catalyst-supply conduit system and one catalyst-removal conduit system, both of said conduit systems communicating with each reactor in said series of reactor vessels, via separate valve means, whereby each reactor can be separately connected or disconnected to flow communication with each of said conduit systems and whereby process-deactivated catalyst present in each reactor is continuously or periodically replaced by fresh catalyst as a slurry in oil via said conduit systems.

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The Hague, Netherlands

Wouter C Van Zijll Langhout