Disposition of a high nitrogen content oil stream

A method of denitrogenating a viscous oil containing a relatively high content of nitrogenous compounds and of disposing of the extract oil stream containing a high concentration of the nitrogenous compounds extracted, comprising:

• a. forming a first portion and a remaining portion of the viscous oil stream;
• said remaining portion comprising a first viscous bottom stream that would not be operably pumpable to a partial oxidation unit without the inclusion of viscosity lowering constitutents;
• b. extracting the nitrogenous compounds from said first portion of the viscous oil with an operable acid solvent to produce a raffinate oil having a relatively low concentration of nitrogenous compounds such that said raffinate oil can be hydrodenitrogenated at mild conditions with reduced hydrogen consumption;
• and an extract stream of high content of nitrogenous compounds;
• c. recovering the acid solvent from said extract stream, simultaneously producing a small volume stream of low viscosity oil containing a high concentration of nitrogenous compounds and referred to as a high nitrogen content oil;
• d. admixing said low viscosity high nitrogen content oil with the remaining portion of said viscous oil comprising said first viscous bottoms stream to provide a pumpable mixed stream;
• e. sending said mixed stream to a partial oxidation unit where hydrogen is produced;
• f. employing the hydrogen produced in step e to effect hydrodenitrogenation of the raffinate oil by hydrogenating the raffinate oil at mild conditions to produce an ultimate product oil stream;
• and
• g. recycling said acid solvent to the extracting operation of step b.