Process for recycling of used lubricating oils

US4366049A · kind A · utility

Assignees

• Leybold-Heraeus GmbH · DE
• Degussa AG · DE

Inventors

• Helmut Knorre · Seligenstadt, DE
• Manfred Langer · Hanau, DE
• Friedrich Fauser · Karlsruhe, DE
• Willi Fischer · Seligenstadt, DE

Key dates

• Filing date: Sep 30, 1980
• Grant date: Dec 28, 1982
• Expiry date: Sep 30, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10M175/0016
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The object of the invention is a process for recycling used lubricating oils. After drying and gasoline removal, the oil is distilled and then treated with sodium or sodium hydride in a finely-divided state at elevated temperature. This is followed by a further distillation. Both distillations are at temperatures below 300.degree. C., the oil fractions of low volatility being respectively distilled in a molecular distillation apparatus at below 2 mbar.