Reactivation of metal-contaminated cracking catalysts

Reactivation of spent catalytic cracking catalyst

Reactivation of steam-deactivated catalysts

Reactor for carrying out a continuous oxydehydrogenation and...

Reclaiming wax contaminated lubricating oils

Recovery of C.sub.3 + hydrocarbon conversion products and net ex

Recovery of hydrogen

Recovery of metal values from petroleum residua and other fracti

Recovery of normally gaseous hydrocarbons from net excess hydrog

Recracking of cat naphtha for maximizing light olefins yields

Recycle of oily refinery wastes

Recycle of oily refinery wastes

Recycle of unconverted hydrocracked residual to hydrocracker aft

Recycle of waste streams

Red mud as a first-stage catalyst in a two-stage, close-coupled

Reduced chaos cyclone separation

Reduced gas holdup in an ebullated bed reactor

Reduced gas holdup in ebullated reactor

Reduced NOx combustion promoter for use in FCC processes

Reduced puffing needle coke from decant oil