Staged Chlorine Capture for High-PVC Pyrolysis
OverviewAnalysisSolutions
Complete
·Feb 2, 2026
The Core Insight

The 150°C temperature gap between HCl release and pyrolysis onset is an asset, not a nuisance

  • PVC dehydrochlorinates at 200-350°C while bulk pyrolysis of PE/PP occurs at 400-550°C.
  • This means you have a dedicated temperature window to capture HCl BEFORE it can damage the main reactor—if you engineer for it.
  • The industry treats this as a transition zone to pass through quickly; it should be treated as a dedicated process step requiring sufficient residence time and appropriate materials.
Viability
Solvable
  • All required components exist commercially; the challenge is optimized integration, not invention.
Key Decision

If you prioritize speed to market and can accept 500 ppm Cl feedstock limit, start with DSI + HDC. If you need to process 2000+ ppm Cl mixed waste and want operational redundancy, pursue the full multi-barrier system.

Solution Paths
01NEEDS VALIDATION

Multi-Barrier Defense System

Three 90% barriers (sorting + sorbent + HDC) achieve 99.9% Cl routing | Integration engineering needed | Higher capital but unlocks 2000+ ppm feedstock

02READY NOW

DSI + HDC Minimum Viable System

Off-the-shelf APC + refinery tech | Phone call to suppliers | Gets you 80% of the benefit immediately

Recommendation
  1. If this were my project, I'd start with the phone calls tomorrow morning.
  2. Contact Babcock & Wilcox about DSI system sizing for your specific gas conditions, and UOP about HDC catalyst qualification with pyrolysis oil samples.
  3. These conversations cost nothing and will tell you within a month whether the 'minimum viable' DSI + HDC system works at your scale and economics.
  4. That gets you to 500 ppm Cl feedstock tolerance immediately.
  5. In parallel, I'd run the process simulation for the full multi-barrier system.
  6. The math says three 90% barriers give 99.9% cumulative protection, but I'd want to see it validated with realistic upset scenarios before committing $6-12M.
  7. Hire a process engineering firm with pyrolysis experience—they can have preliminary results in 6-8 weeks.
  8. The innovation concepts are strategic hedges, not near-term priorities.
  9. I'd allocate $100-200K for the Fe⁰ revival lab study—if the chemistry works with modern equipment, it's potentially the cheapest approach.
  10. But I wouldn't bet the company on it.
  11. Molten salt is fascinating technology, but it's a 3-5 year bet, and you need revenue before then.
  12. The real insight here isn't any single technology—it's the multi-barrier philosophy.
  13. Stop looking for the silver bullet.
  14. Accept that three imperfect solutions beat one imperfect solution with single-point failure.
  15. The incinerator industry figured this out decades ago; the pyrolysis industry is just catching up.

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