Apparatus and process for treatment of waste oils

A process for reclaiming fuel oil from waste oil, comprising the steps of:

• (a) increasing the pressure inside a thermal cracking vessel up to 50˜100 psi by feeding waste oil to the thermal cracking vessel using a high pressure pump;
• (b) heating the thermal cracking vessel until the temperature inside the thermal cracking vessel reaches about 200° C.;
• (c) slightly opening the thermal cracking vessel to release any trapped air in the vessel to the atmosphere and closing the vessel;
• (d) heating the thermal cracking vessel to maintain the temperature inside the thermal cracking vessel at a constant value in the range of 300˜350° C. until about 50% of the waste oil is removed from the vessel by thermal cracking;
• (e) stopping heating and depressurizing the thermal cracking vessel at least up to 10−6 torr;
• and
• (f) removing vacuum pressure inside the thermal cracking vessel when about 70% of the waste oil goes through thermal cracking.