Treatment of used lubricating oil to reduce content of suspended particulates.

摘要

Process for treating used lubricating oil to reduce the content of suspended particulate matter therein, characterized by contacting said used lubricating oil with a carbonyl-group containing compound in the presence of an aqueous electrolyte, separating the resulting mixture into an upper layer containing clarified oil and a lower layer containing agglomerated particulates, and recovering oil of reduced particulate content as product. Suitable carbonyl-group containing compounds include ketones, esters and aldehydes and suitable electrolytes include inorganic and organic acids, alkalis and salts.