Can we purify used engine oil?
If your engine oil is left unchanged for too long, it may become inundated with debris particles. Purifying used engine oil is best accomplished by using two methods: Centrifugal purifier. Bypass filtration.
Recycling and reusing used motor oil is preferable to disposal and can provide great environmental benefits. Recycled used motor oil can be re-refined into new oil, processed into fuel oils, and used as raw materials for the petroleum industry.
Use An Engine Flush
The simplest solution here is to use a chemical engine sludge remover. There are some sources that don't really like them, but they are the easiest way to get rid of engine sludge. They are typically added to the old oil, then you idle the engine for 5-10 minutes without driving it.
Steps to Clean
Using a clean white cloth, sponge the stain with the dry cleaning solvent. Blot until the solvent is absorbed. If the stain remains, mix one tablespoon of liquid dishwashing detergent and one tablespoon of white vinegar with two cups of warm water. Sponge the stain with this solution.
A process known as pyrolysis already exists for recycling oil that involves heating it to a high temperature in the absence of oxygen. Pyrolysis breaks down the oil into a mixture of gases, liquids and solids. The gases and liquids can be converted into gasoline or diesel fuel, though not very easily.
You can reuse oil filters, but can you reuse motor oil? Absolutely! Not in the way most people think, though. You can't drain the old oil out of your vehicle and then put it back in.
Simply put, the shelf life of conventional motor or "lube" oil is up to five years. It's not something that goes bad in a couple of months. It's impossible to predict exactly how long motor oil shelf life is because petroleum stability (how well it resists change in its properties) is situation-dependent.
Used engine oil can, in fact, be cleaned and reused. The old oil is refined into new oil, lubricants, fuel oils and used for raw materials. The old oil also comprises of metals which can be recycled.
Hexane – This oil dissolving solvent is known for its ability to effectively break up cooking oils. For this reason there are many cleaning and degreasing agents that contain hexane as an oil dissolving additive.
The best method of purification would be to use a combination of both purifiers and bypass filtration, since each has its limitations. Centrifugal purifiers are good at removing larger particles and water but not for removing the smaller organo-metallic particles, which a filter will remove.