1. A process for treating high sulfur Heavy Marine Fuel Oil for use as feedstock in a subsequent refinery unit, the process comprising: mixing a quantity of Feedstock Heavy Marie Fuel Oil with a quantity of Activating Gas mixture to give a Feedstock Mixture; contacting the Feedstock Mixture with one or more catalysts under reactive conditions to form a Process Mixture from said Feedstock Mixture; receiving said Process Mixture d separating liquid components of the Process Mixture from bulk gaseous components of the Process Mixture; subsequently separating residual gaseous components and by-product hydrocarbon components from the Process Mixture to form a Product Heavy Marine Fuel Oil; and, discharging the Product Heavy Marine Fuel Oil to a subsequent refinery unit, and wherein said Product Heavy Marine Fuel Oil is a suitable feedstock for anode grade coking and said Product Heavy Marine Fuel Oil has a sulfur content less than about 1.0 wt %; and a vanadium content less than about 100 ppmw and nickel content less than about 100 ppmw.
