Researchers at Virginia Tech have developed a chemical recycling method that converts waste polyvinyl chloride (PVC) into a synthetic lubricating oil, potentially offering a new way to handle one of the most difficult plastics to recycle.
Published in Nature in August 2026, the study describes a process that avoids the conventional steps of sorting, melting and remolding PVC. Instead the researchers dissolve the plastic and chemically remove its chlorine before converting the remaining material into polyalphaolefin (PAO) a type of synthetic oil used in engine and gearbox lubricants.
PVC is produced at a global scale of about 60 million tonnes a year but only a small fraction is recycled. In the United States less than 5,000 tonnes of the approximately 840,000 tonnes of PVC entering the municipal solid waste stream in 2018 was recycled according to US Environmental Protection Agency data cited in the report.
The difficulty comes partly from PVC’s chemistry. About 57 per cent of pure PVC by weight consists of chlorine which is chemically bound to the polymer. Heating PVC can release corrosive hydrogen chloride and, under unsuitable conditions generate hazardous chlorinated compounds. PVC products also contain varying combinations of plasticisers, stabilisers, fillers and other additives, making mixed waste streams particularly challenging to process.
The Virginia Tech process tackles the chlorine problem chemically rather than through high temperature treatment. Dissolved PVC is treated with aluminium trichloride and alpha olefins and heated to about 70 degrees Celsius for three hours. The researchers reported that the process removed more than 99.98 per cent of the chlorine.
The resulting material is a thick amber coloured oil rather than a lower grade plastic. According to the study, its viscosity, friction and wear resistance characteristics are comparable with commercial PAO lubricants, which are widely used in applications where reducing friction and wear is important.
The researchers also assessed the potential economics of scaling up the process. Their analysis of a hypothetical facility capable of processing 50,000 tonnes of waste annually projected a 22.8 per cent return on an estimated $84 million investment with the investment potentially recovered in less than five years.
However, the technology remains at the laboratory proof of concept stage. Processing controlled samples is considerably different from handling large quantities of contaminated and mixed PVC waste and the researchers’ economic projections are based on a hypothetical industrial facility.
The study nevertheless points to a different approach to PVC recycling: rather than attempting to preserve the plastic as a material, the process chemically transforms it into a higher value product. Whether the method can operate economically and reliably at industrial scale will depend on further testing with real-world PVC waste.