Plastic to oil is a depolymerization process using hydrous pyrolysis for the reduction of complex organic materials (usually waste products of various sorts, often biomass and plastic) into light crude oil. It mimics the natural geological processes thought to be involved in the production of fossil fuels. Under pressure and heat, long chain polymers of hydrogen, oxygen, and carbon decompose into shortchain petroleum hydrocarbons.
The conversion process starts from shredding
the plastic to small pieces. Pieces are then put
in large cartridges and loaded into processing
vessels. The solid plastic is first melted into a
liquid, which is heated to a vapor state then
condensed back into a liquid.
It's at that point the oil is separated from all the other chemicals and contaminants in the plastics.