Continuous plural stage heated vapor injection process for recovering lube oil base stocks from used motor oil formulations, and asphalt blend compositions containing used motor oil bottoms from said process

A continuous process for recovering lubricating oil boiling range hydrocarbons from used lubricating oil comprising:

• i) continuously charging a used motor oil fraction to a Used Motor Oil (UMO) thermal treatment/vaporization means;
• ii) continuously injecting into said UMO a heating vapor comprising at least a majority, on a molar basis, of at least one member of the group of methane, ethane, propane, steam, and mixtures thereof, and wherein the amount and temperature of said injected heating vapor is sufficient to vaporize at least a majority, on a molar basis, of said lubricating oil boiling range components, which are continuously removed as an overhead vapor fraction as a product of the process;
• and
• iii) continuously removing from a bottom portion of said thermal treatment means a bottoms fraction.