Cat Gas HDS
Hydrotreating is a catalytic process to stabilize products and remove objectionable elements, particularly sulfur, by reacting them with hydrogen. When the process is applied specifically for sulfur removal it is generally called hydrodesulfurization (HDS). The HDS unit uses a cobalt-molybdenum catalyst to remove sulfur by converting it to hydrogen sulfide that is removed with unreacted hydrogen.
Reactor conditions are relatively mild for naphtha range HDS at 400-500˚F (205-260˚C) and relatively moderate pressure 350-650 psi (25-45 bar). As coke deposits on the catalyst, reactor temperature must be raised. Once the reactor temperature reaches ~750˚F (400˚C), the unit is scheduled for shutdown and catalyst replacement.
Operating conditions are controlled to remove sulfur while maintaining octane qualities of Cat Gasoline. Vapor pressure may be adjusted prior to blending into finished gasoline.
