Spent Engine Oil Recycling

Spent engine oil is routinely dumped for want of an accessible recovery route, yet purification is far cheaper than producing the same lubricant from fresh crude, because the molecule is already built and only the contaminants need to be removed. Spent engine oil recycling is a matter of choosing the right purification method for the oil in hand.

Why the Used Oil Is Worth Recovering

Engine oil in service picks up carbon from wear, oxidised lubricant, and water, and its additive package is spent, which is what darkens the fluid and degrades performance. Recycling is the mechanism of removing those impurities and returning the oil toward its original state. The economics are compelling: a study of the process found that recycling twenty-five litres of spent oil yielded ten litres of reusable lubricating oil, where producing that same ten litres from crude would have demanded roughly two hundred and twenty litres of crude.

Acid and Carbon Extraction

One widely studied route pairs solvent extraction with two reagents. The spent oil is first mixed with concentrated sulphuric acid, heated, and left to settle so that sludge, water, and insoluble matter drop out and can be decanted away. The decanted oil is then contacted with activated carbon at elevated temperature for several hours, which adsorbs a broad range of organic contaminants, before the oil is filtered and cooled. The result is a clarified oil ready for re-blending, often supplemented with fresh base stock or additives to restore full specification.

Proving the Oil Is Clean

Whether the treated oil is fit for reuse, and in what service, is established by standard tests, flash point, viscosity, total base number, and pour point among them. The method chosen determines the level of cleanliness reached, and those measurements are what confirm a recycled oil is suitable for return to duty rather than merely looking cleaner than it arrived.

Learn More:

• Feasibility Studies for Waste-to-Value Projects
• Turn-Key EPC Delivery
• Plant Design & Engineering
• Facility Efficiency Upgrades
• Resource Recovery Projects

Recover the Most Value per Litre

The purification route sets both the quality of the recovered oil and the operating cost, so matching the method to the feedstock is where margin is made.

Klean Industries provides feasibility studies, engineering, and turn-key delivery for waste-to-value and resource-recovery facilities, including recovered oil and fuel production.

Considering a spent oil recovery project?

Contact Klean Industries about spent oil recovery » GO.