THE RE-REFINING OF USED LUBRICATING OILS

The lube oils used by vehicle engines have to be replaced at least every 5,000 km.

This oil used to be dumped, but now most of it's re-refined and reused. This is done in a 3 step process, in which water, solids, lighter oils, dissolved metals, degraded additives etc. are removed.

Step 1 - Dehydration

The oil is boiled in a closed container to remove the water that has been mixed into it.

Step 2 - Diesel stripping

The dehydrated oil is then fed continuously into a vacuum distillation plant for fractionation. Lighter oils boil off first and are removed, followed by the lubricating oil itself. Other heavier components do not boil in the conditions used.

Step 3 - Lube oil distillation and condensation

A liquid extraction process then removes any aromatic components from the oil. By this stage, the oil is identical to refined virgin oil. It is then tested, appropriate additives are added and the oil is ready to be reused.


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