Dear Ziad Eldoadoa,

Actually, Waste oil is defined as any petroleum-based or synthetic oil that, through contamination, has become unsuitable for its original purpose due to the presence of impurities or loss of original properties.

The purpose of filtering and demineralisation is to remove inorganic materials and certain additives from used oil to produce a cleaner burner fuel or feed for re-refining.

Used oil feedstock is transferred to a reaction tank (A) and mixed with a small quantity of sulphuric acid and heated to about 60oC. A chemical surface-active reagent, called a surfactant, is added to the reactor (A) and after stirring the mixture is allowed to stand. This allows the mixture to separate into two "phases" - i.e. oil and water-based or aqueous. The reagent causes the contaminants to accumulate in the aqueous phase, which settles to the bottom of the tank (A) and is drained off as slurry. This phase contains acid, used oil contaminants, including metals and some of the oil additives. The water is dried off, leaving a solid waste that must be disposed of.

This link will help you for more information,

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.epa.gov/sites/production/files/2016-04/documents/50fr49164_1.pdf&ved=2ahUKEwidyrHdscHoAhUnA2MBHXxRBqgQFjAbegQIBBAI&usg=AOvVaw3FtgNdo4EMy6UVVSxh7I0d&cshid=1585543740098

Hope you understand about it.

If any question feel free to ask me.

Thanks.

Zia Hameed nice answer but unfortunately its not related to the question

Dear Ziad Eldoadoa,

Actually its not my field of research and study.

But it seems interesting in energy generation point of view that's why i am trying to study it.

Thanks for your reply. I will try to understand it.

Monomers and Polymers materials type can convert to liquid, but cloths, paper types can not make liquid fuels. In this case, it can convert to biogas.