Chemical Recycling of PVC: From Laboratory Promise to Industrial Reality
By Rajendra Gupta
This article is authored by Rajendra Gupta, Technical Professional Leader for KBR’s Advanced Recycling Technologies. It examines why PVC’s chlorine-rich chemistry makes recycling challenging – and what must change to move chemical recycling from pilot plant applications to industrial scale.
Polyvinyl chloride (PVC) is a widely used plastic that is used in many different products and applications such as making pipes, electrical cable insulation, window frames, flooring, and many other everyday products. It is produced from chlorine gas and ethylene, and its demand is expected to rise steadily through 2030, increasing by roughly 4.8% per year.
Since ethylene is primarily derived from fossil fuels, the continued growth in PCV production to meet the growing need will further lead to a depletion in fossil resources.
Downsides of PVC growth
Despite its extensive use, only a small fraction of PVC waste is recycled – most ends up in landfill. Current projections indicate that by 2032, only about 1.2% of total PVC produced will be recycled, highlighting a significant gap in sustainable material management.
Besides, high chlorine content and diverse additives make PVC difficult to process, leading to corrosion, and contamination. Advancing PVC recycling requires efficient chlorine recovery, corrosion-resistant designs, long-term pilots and supportive policy frameworks.
In 2000, Europe took the lead to address this challenge and the European PVC industry launched Vinyl 2010, a voluntary commitment bringing together producers, converters and recyclers to enhance recycling infrastructure, and promote the use of recycled PVC. Today, its successor program, VinylPlus, continues that work.
According to its 2024 report, Europe now collectively recycles approximately 0.8m t/y of PVC. However, achieving higher global recycling rates requires commercial-scale PVC recycling plants capable of processing complex waste streams.
Why Not Mechanically Recycle PVC
Mechanical recycling is a method by which plastic is physically reprocessed or reformed rather than chemically broken down and rebuilt. It works well for relatively pure plastic streams, but PVC has additives that make mechanically recycled PVC samples discolored, brittle or structurally compromised.
Chemical recycling, on the other hand, breaks PVC down to molecular components and rebuilds it or converts it into valuable chemicals. Three main approaches to it are:
Gasification: Turns PVC waste into syngas (hydrogen and carbon monoxide) at very high temperature with limited oxygen.
Dechlorination: Removes chlorine from PVC as hydrogen chloride (HCl) before further recycling.
Pyrolysis: Heating PVC without oxygen to break it into oil, gas, and char.
However, across all three methods, several interconnected challenges emerge from PVC’s high chlorine content. It leads to corrosion as HCl formation rapidly degrades reactor internals and downstream systems. Incomplete combustion of chlorine-containing compounds can form toxic, highly regulated substances and meeting environmental standards requires sophisticated off-gas treatment systems and continuous monitoring, adding operational complexity and cost and chlorinated tars can foul equipment, reduce efficiency and require frequent shutdowns for cleaning.
Scalability factor
Beyond technical feasibility, the scalability of PVC chemical recycling is mainly constrained by economic and operational realities. Techno-economic assessments suggest that, under current conditions, chemically recycled PVC is more expensive than virgin PVC, with indicative costs typically around 1.5–2.5 times higher per ton, depending on feedstock quality, chlorine recovery efficiency and plant scale. However, most PVC chemical recycling technologies remain at pilot or early demonstration scale, making direct comparison with mature, large-scale virgin PVC production premature. Robust benchmarking will require long-duration, at-scale operation using real post-consumer PVC waste streams.
Below are the priorities for advancing PVC chemical recycling toward commercial viability:
- Chlorine recovery: Develop efficient systems to capture and purify HCl into marketable hydrochloric acid, turning waste into value.
- Durable materials and reactor design: Invest in corrosion-resistant alloys, linings and coatings validated under industrial conditions.
- Pilot demonstrations: Operate long-term pilots using real post-consumer PVC to uncover operational and maintenance realities.
- Economic transparency: Conduct open techno-economic studies to define viable scales, costs and market drivers.
- Policy support: Implement incentives such as extended producer responsibility (EPR) schemes, landfill limits, and credits for recycled chlorine.
- Collaboration: Foster partnerships among PVC producers, recyclers, chemical firms and equipment suppliers, building on models like VinylPlus.
KBR’s role in recycling technologies
KBR understands the challenges and limitations involved in PVC recycling with the current technologies. With its strong experience in process engineering and recycling technologies, KBR is continuously working to evaluate and develop the most practical and effective solutions. The goal is to provide clients with reliable, safe, and economically viable technology for PVC recycling.
Our Advanced Recycling Technology (ART) portfolio includes the Hydro-PRT® process for polyolefin (polyethylene and polypropylene) plastic recycling and TyreNova℠ for tire recycling. Both are based on chemical recycling.
Conclusion
Chemical recycling offers a realistic pathway for diverting PVC waste from landfills and incineration, reducing its environmental footprint. Laboratory and pilot projects prove its technical feasibility, yet large-scale deployment remains hindered by chlorine content and additive complexity.
Emerging dehydrochlorination and recovery methods show real potential – but success will depend on continued R&D, industrial investment and supportive policy frameworks.
The question is no longer whether we can recycle PVC chemically, but ifwe will invest enough to make it happen, and KBR is constantly innovating to develop the most viable solution for addressing this challenge.
This article was published in the February issue of The Chemical Engineer magazine. : https://www.thechemicalengineer.com/features/chemical-recycling-of-pvc-from-laboratory-promise-to-industrial-reality/
