วิทยานิพนธ์ (วท.ม.)--จุฬาลงกรณ์มหาวิทยาลัย, 2542

A one-step catalytic hydrotreatment of used automotive lubricating oil was developed. The catalysts were NiO/WO₃/F and NiO/MoO₃/F on alumina. The operating conditions were studied in temperature, hydrogen pressure, reaction time and catalyst concentration. It was found that the suitable conditions for the NiO/WO₃/F on alumina catalyst were at 350 °C, hydrogen pressure of 500 psig, reaction time of 22.50 hours and catalyst concentration of 30%wt. The hydrotreated oil obtained from these conditions had good properties especially color, viscosity index, acidity, sulfur and metal content. The suitable conditions for the NiO/MoO₃/F on alumina catalyst were at 350 °C, hydrogen pressure of 500 psi, reaction time of 2.50 hours, and concentration of 30%wt. The hydrotreated oil obtained from these conditions had good properties especially color, acidity, sulfur and metal content. The hydrotreated oil which was obtained from using two types of catalyst had good properties and it could be used as lube base oil. It had high viscosity index, low acidity, sulfur and metal content.