MULTI-STAGE SULFUR REMOVAL SYSTEM AND PROCESS FOR AN AUXILIARY FUEL SYSTEM

A system for producing an auxiliary fuel stream containing a low concentration of sulfur compounds from a primary fuel stream includes a first separation stage separating the fuel into first vapor permeate and first retentate streams, a first partial condenser connected to the first vapor permeate stream condensing the permeate stream into first liquid and vapor streams, and a second partial condenser condensing a portion of the first vapor stream into a second liquid stage. The permeate stream is preferably sent through a desulfupzation reactor The process includes isolating first vapor permeate and first retentate streams from a primary fuel stream using a first membrane separation stage, condensing a portion of the permeate stream in a condenser into liquid and vapor streams, and passin the vapor stream through a desulfurization reactor and then optionall through a sorbent bed removin sulfur compounds.