Vacuum distillation is often overlooked in favor of simpler processes like filtration or centrifugation in waste oil recycling. However, for plants aiming to maximize base oil recovery, this technology is pivotal. This blog explores how vacuum distillation elevates both yield and purity in modern waste oil recycling facilities.

The Challenge with Conventional Methods

Typical methods like sedimentation or chemical treatment help remove water and solids but fall short when it comes to recovering high-quality base oils. Contaminants like additives, oxidized hydrocarbons, and trace metals remain, reducing the oil's value.

Vacuum Distillation: How It Works

Vacuum distillation involves heating waste oil in a reduced-pressure environment. This significantly lowers the boiling points of components, allowing for separation at lower temperatures—minimizing thermal degradation. The process separates oil into light fractions, base oils, and heavy residues.

Benefits for Recycling Plants

Higher Recovery Rate: Compared to atmospheric distillation, vacuum systems can recover up to 80% more reusable base oil.

Better Purity: The reduced thermal stress prevents oil molecule breakdown, resulting in cleaner outputs.

Versatility: Plants can tweak parameters to target specific oil grades, whether SN150 or SN500.

Case Study

A mid-sized recycling plant in Southeast Asia upgraded its system with vacuum distillation in 2022. Within six months, the base oil yield increased by 22%, and product quality met API Group II standards—opening up new B2B market opportunities.

Conclusion

Vacuum distillation is not just a premium option; it’s becoming a necessary investment for any waste oil recycling plant that wants to remain competitive and environmentally compliant.