Interview: Practitioners on Chemical recycling & advanced sorting — what they wish they knew earlier

Chemical recycling has attracted over $10 billion in announced investments globally since 2020, yet fewer than 20 commercial scale facilities were operating profitably by the end of 2025. Advanced sorting technologies powered by artificial intelligence and near infrared spectroscopy have transformed material recovery facility throughput, but adoption remains uneven and the economics are more nuanced than equipment vendors suggest. We spoke with five practitioners across the chemical recycling and advanced sorting value chain to surface the hard won lessons, common mistakes, and candid advice that rarely appear in conference presentations or investor decks.

Why It Matters

The United States generates approximately 292 million tons of municipal solid waste annually, of which only 32% is recycled or composted according to the Environmental Protection Agency. Plastics present the sharpest challenge: of the 40 million tons of plastic waste generated in the US each year, less than 6% is mechanically recycled. Chemical recycling, which breaks down polymer chains through pyrolysis, gasification, or solvolysis to produce feedstocks for new plastic production, has been positioned as the technology that will close this gap. The American Chemistry Council projects that chemical recycling capacity in the US could reach 8.3 million tons per year by 2030 if current investment commitments translate to operational facilities.

Advanced sorting technologies sit upstream of both mechanical and chemical recycling, determining what materials enter which processing pathway. The quality of feedstock preparation has emerged as perhaps the single most important variable in chemical recycling plant economics, a lesson that many early projects learned through expensive operational failures.

For investors evaluating opportunities in this space, understanding what practitioners have learned through direct experience is essential to distinguishing viable projects from those likely to underperform. The gap between techno economic models and real world operations remains significant, and the practitioners we interviewed were remarkably consistent in identifying where that gap originates.

Key Concepts

Chemical recycling encompasses multiple technology pathways that convert waste plastics into chemical feedstocks. Pyrolysis heats plastic waste in the absence of oxygen to produce pyrolysis oil, which can be refined into monomers or fuel blendstock. Gasification converts waste into synthesis gas (a mixture of carbon monoxide and hydrogen) that serves as feedstock for chemical manufacturing. Solvolysis uses solvents to selectively dissolve specific polymers, enabling separation and purification for direct repolymerisation. Each pathway has distinct feedstock requirements, capital intensity, and output quality characteristics.

Advanced sorting refers to automated systems that identify and separate waste materials at speeds and accuracies exceeding manual sorting capabilities. Key technologies include near infrared (NIR) spectroscopy for polymer identification, hyperspectral imaging for colour and additive detection, X-ray fluorescence for elemental analysis, and AI powered robotic pick and place systems. Modern sorting lines can process 60 to 120 items per minute per sorting station with accuracy rates above 95% for target materials.

Mass balance accounting is a chain of custody approach that tracks the proportion of recycled content through complex manufacturing processes where recycled and virgin feedstocks are physically mixed. The International Sustainability and Carbon Certification (ISCC PLUS) scheme provides the dominant mass balance framework for chemical recycling, enabling producers to allocate recycled content credits to specific product lines even when production uses blended feedstocks.

The Interviews

On Feedstock Quality: "Garbage In, Garbage Out Still Applies"

Sarah Chen, Vice President of Operations at a pyrolysis facility in Houston, Texas, with four years of commercial operating experience, was blunt about the single biggest lesson her team learned.

"Every techno economic analysis we reviewed during the investment phase assumed feedstock quality that does not exist in the real world. The models assumed clean, sorted, single polymer streams with less than 5% contamination. What actually arrives at our facility, even from sophisticated material recovery facilities, averages 12 to 18% contamination including PVC, metals, organics, and moisture. PVC is the killer. Even 1% PVC content generates hydrochloric acid in the reactor, corroding equipment and contaminating the pyrolysis oil to the point where refiners will not accept it."

Chen's facility spent $14 million retrofitting its front end processing line with additional NIR sorting, magnetic separation, and density based classification systems that were not included in the original plant design. "If I could go back, I would have invested twice as much in feedstock preparation and half as much in reactor capacity. The reactor works fine when you feed it clean material. The problem was never the reactor."

This experience aligns with data from the Closed Loop Partners 2025 infrastructure audit, which found that 72% of US chemical recycling facilities that experienced operational difficulties cited feedstock quality as the primary cause, ahead of equipment reliability (18%) and market conditions (10%).

On Economics: "The Pyrolysis Oil Price Assumption Broke Our Model"

Marcus Williams, Chief Financial Officer of a mid scale chemical recycling company in Ohio, shared the financial realities that diverged from initial projections.

"We built our financial model assuming pyrolysis oil would trade at a consistent premium to virgin naphtha because of its recycled content value. In 2022 and early 2023, that was true. We were selling at $900 to $1,100 per tonne, roughly a 30 to 40% premium. By late 2024, as more capacity came online and virgin oil prices dropped, our realised price fell to $650 to $750 per tonne. That 25 to 30% revenue decline on a business with 15 to 20% target margins was devastating."

Williams emphasised that the revenue model for chemical recycling depends heavily on three factors that are difficult to predict: virgin polymer pricing, the premium buyers will pay for recycled content, and the availability of regulatory mandates that create guaranteed demand. "The European Union's Packaging and Packaging Waste Regulation requiring 10% recycled content in contact sensitive plastic packaging by 2030 is exactly the kind of demand signal that stabilises our business. The US has no federal equivalent, and state level mandates in California, New Jersey, and Washington cover less than 15% of national plastic demand."

He advised investors to stress test models with pyrolysis oil prices at or below virgin naphtha parity and to evaluate projects based on their ability to survive a two to three year period of compressed margins.

On Advanced Sorting: "AI Is Real, But Integration Is Everything"

Dr. James Park, Director of Technology at a national waste management company operating 37 material recovery facilities across the US, provided perspective on the sorting technology landscape.

"We have deployed AI powered robotic sorting systems from AMP Robotics, ZenRobotics, and Machinex across 14 facilities since 2021. The technology works. Our contamination rates in sorted bales dropped from 8 to 12% to 3 to 5%, and we recovered an additional 4 to 7% of recyclable material that was previously going to landfill. But here is what nobody told us: the integration cost and timeline exceeded every vendor proposal by 40 to 60%."

Park explained that the disconnect between vendor promises and operational reality stemmed from three factors. First, existing conveyor systems, designed for manual sorting at 30 to 40 items per minute, required modification to handle the 90 to 120 items per minute that AI robotic systems can process. Second, lighting, belt contrast, and material presentation conditions on existing lines rarely matched the controlled environments where vendor accuracy claims were validated. Third, the AI models required 3 to 6 months of on site training with local waste compositions before reaching advertised accuracy levels. "Waste in Phoenix looks nothing like waste in Portland. The models need local data."

Despite these integration challenges, Park considers advanced sorting the single highest ROI investment in the recycling value chain. "A $2 to $3 million robotic sorting cell pays for itself in 18 to 24 months through improved bale quality, reduced contamination penalties, and recovered material value. That is faster than almost any other capital investment in our industry."

On Scale Up: "Pilot Results Do Not Predict Commercial Performance"

Elena Rodriguez, former Chief Technology Officer at a solvolysis startup that raised $180 million before entering commercial operations in 2024, described the scale up challenges that no laboratory or pilot programme adequately prepared her team for.

"At pilot scale, our PET solvolysis process achieved 95% monomer recovery with better than virgin quality output. The chemistry worked beautifully at 5 tonnes per day. When we scaled to 50 tonnes per day, we encountered heat transfer limitations, solvent recovery inefficiencies, and contaminant accumulation issues that reduced monomer recovery to 78% and required 35% more solvent per tonne than projected. These are engineering problems, not chemistry problems, but they consumed 18 months of troubleshooting and $40 million in unplanned capital expenditure."

Rodriguez identified a systemic issue in how chemical recycling companies communicate with investors. "There is enormous pressure to present pilot data as representative of commercial performance. It is not. Every chemical process behaves differently at 10x scale. Investors need to ask specifically about mass and energy balance validation at the target commercial scale, not pilot scale, and they should expect first of a kind commercial facilities to operate at 60 to 70% of design capacity for the first 12 to 18 months."

Her advice for founders: "Build a 30% contingency into your capital budget and a 50% contingency into your timeline. If the process works at pilot and the market exists, you will get there. But it will cost more and take longer than anyone wants to admit."

On Regulation: "Policy Is the Market Maker"

David Kim, Managing Director of a private equity fund focused on circular economy infrastructure, provided the investor perspective on how regulation shapes the opportunity.

"We have evaluated over 200 chemical recycling and advanced sorting investments since 2020. The single best predictor of project success is not the technology, the team, or the feedstock supply. It is the regulatory environment. Projects in jurisdictions with binding recycled content mandates, extended producer responsibility (EPR) programmes with eco modulation, and chemical recycling included in recycling rate definitions consistently outperform those without."

Kim pointed to the contrast between European and US regulatory frameworks. "In Europe, the Packaging and Packaging Waste Regulation, the Single Use Plastics Directive, and national EPR schemes with escalating recycled content requirements create a regulatory floor under demand. In the US, we have a patchwork of state level mandates, ongoing debates about whether pyrolysis counts as recycling, and no federal recycled content requirement. This regulatory uncertainty is the primary reason European chemical recycling projects trade at premium valuations."

He emphasised that investors should evaluate regulatory risk as carefully as technology risk. "A perfectly functioning pyrolysis plant in a state that does not classify its output as recycled content is worth dramatically less than a marginally performing plant in a jurisdiction where its output counts toward mandatory recycled content targets."

Key Players

Chemical Recycling Operators

PureCycle Technologies operates the world's first commercial polypropylene purification facility in Ironton, Ohio, using Procter and Gamble licensed solvent based technology. Their facility reached commercial production in 2024 after significant construction delays.

Plastic Energy runs two commercial pyrolysis plants in Spain and has partnered with ExxonMobil, SABIC, and TotalEnergies to develop larger facilities in Europe and Asia.

Eastman Chemical commissioned its $250 million polyester renewal facility in Kingsport, Tennessee, using methanolysis to convert waste polyester into virgin quality PET and copolyester monomers.

Advanced Sorting Technology

AMP Robotics has deployed AI powered sorting robots at over 150 facilities globally, with the largest US installed base among robotic sorting providers.

TOMRA manufactures sensor based sorting systems including NIR, electromagnetic, and laser sorters used in approximately 100,000 installations worldwide.

ZenRobotics (now part of Terex) provides AI robotic sorting for construction and demolition waste as well as mixed municipal streams.

Action Checklist

• Request feedstock quality data from actual commercial operations rather than relying on techno economic model assumptions when evaluating chemical recycling investments
• Stress test financial models with pyrolysis oil pricing at or below virgin naphtha parity for at least 24 months during the projection period
• Verify that advanced sorting vendor accuracy claims have been validated in operational environments with local waste composition, not laboratory conditions
• Budget 30 to 50% contingency for first of a kind commercial chemical recycling facilities beyond initial capital estimates
• Map the regulatory landscape in target jurisdictions including recycled content mandates, EPR eco modulation, and classification of chemical recycling outputs
• Evaluate mass balance certification (ISCC PLUS or equivalent) readiness as a prerequisite for premium pricing on recycled content claims
• Assess feedstock supply agreements for volume, quality specifications, and contamination penalties before committing to plant investment

FAQ

Q: What is a realistic timeline from pilot to profitable commercial chemical recycling operations? A: Based on practitioner experience, expect 4 to 6 years from successful pilot (TRL 6 to 7) to profitable commercial operations. This includes 18 to 24 months for detailed engineering and permitting, 18 to 24 months for construction and commissioning, and 12 to 18 months for operational ramp up to design capacity. First of a kind facilities consistently take longer than second and third installations due to learning curve effects.

Q: How much does advanced AI sorting actually improve material recovery facility economics? A: Practitioners report that AI robotic sorting systems improve recovered material value by 15 to 25% through higher bale quality and reduced contamination, while simultaneously recovering 4 to 7% of recyclable material previously sent to landfill. Total installed costs of $2 to $4 million per sorting cell yield payback periods of 18 to 30 months. However, integration costs consistently exceed vendor estimates by 40 to 60%, so budget accordingly.

Q: Is chemical recycling genuinely circular, or is it primarily producing fuel? A: This remains the most contested question in the industry. According to the US Department of Energy, approximately 60% of US pyrolysis oil production in 2025 was directed to fuel blending rather than plastic to plastic recycling. True circularity requires pyrolysis oil to be upgraded and cracked back into monomers, which adds $200 to $400 per tonne in processing costs. Solvolysis and depolymerisation technologies produce higher quality monomer outputs more directly suited to circular applications, but handle narrower feedstock ranges. Investors should scrutinise the actual end market for chemical recycling outputs rather than accepting generic circularity claims.

Q: What is the biggest risk factor that investors underestimate in chemical recycling? A: Every practitioner we interviewed identified feedstock supply and quality as the most underestimated risk. Securing consistent, contract backed feedstock supply with defined quality specifications is more difficult than most investment theses assume. Competition for high quality waste plastic feedstock has intensified as more facilities come online, and municipal waste contracts are typically controlled by a small number of waste management companies with significant bargaining power. Projects without secured long term feedstock agreements face existential supply risk.

Sources

• US Environmental Protection Agency. (2025). Advancing Sustainable Materials Management: 2023 Fact Sheet. Washington, DC: EPA.
• American Chemistry Council. (2025). Chemical Recycling Investment Tracker: US Market Update Q4 2025. Washington, DC: ACC.
• Closed Loop Partners. (2025). US Chemical Recycling Infrastructure Audit: Operational Performance and Lessons Learned. New York: Closed Loop Partners.
• European Commission. (2025). Packaging and Packaging Waste Regulation: Implementation Guidance for Recycled Content Requirements. Brussels: EC.
• US Department of Energy. (2025). Plastics Innovation Challenge: Chemical Recycling Pathways and Market Analysis. Washington, DC: DOE.
• ISCC. (2025). Mass Balance Certification for Chemical Recycling: Annual Statistical Report 2025. Cologne: ISCC.
• TOMRA. (2025). Sensor Based Sorting Technology: Performance Benchmarks Across 100,000 Installations. Asker: TOMRA Systems.