Patent ID: 6068759
Filing Date: 2000-05-30
Classification: C08L,C10G,C10L,C10M

Abstract:
A process for recovering lube oil base stocks from used lubricating oil formulations containing base oil stock and organo-metallic component which comprises:i) directly contacting said used lubricating oil with a heated vapor selected from the group consisting of methane, ethane, propane, and steam, under temperature, contact times, and superficial velocity conditions sufficient to at least partially decompose said organo-metallic component and provide a desired volume of pumpable bottoms, and vaporized overhead comprising gases and distillatable hydrocarbons, with no substantial carryover of metals into the overhead;ii) condensing said overhead in at least one stage;iii) recovering at least part of said overhead as distillate; andiv) recovering a bottoms fraction containing organo-metallic compound decomposition products.