Regeneration of used Lubricating Oil

摘要

Used lubricating oil 101 is purified by treating the used oil with an aqueous solution of an ammonium salt 105 capable of reacting with ash forming components in the oil, removing a major portion of the water from the mixture at 109, removing solids from the mixture at 121, vacuum fractionating the partially purified oil at 20 and treating at least one of the fractions by hydrotreating and/or treating with clay. IMAGE