Who Owns Tire Pyrolysis Technology

The field looks crowded — fifteen-plus commercial players — but it sorts into six technology families, and into a sharper question: operator, or owner?

Tire pyrolysis heats end-of-life tires to roughly 500 °C and above in the absence of oxygen, breaking the rubber polymers into three streams: a condensable oil, a non-condensable gas, and a carbon-rich solid that is milled and pelletised into recovered carbon black (rCB). Every serious player varies this — but the variation clusters into six reactor families.

The six technology families

Batch

Rotating-drum reactors loaded, heated, cooled and discharged per cycle (8–14 hours). Simple and low-cost, accepts coarse or whole-tire feed; but small scale, thermally inefficient, and prone to higher carbonaceous residue from polymer carbonisation.Examples: Kal Tire (Chile), most Chinese and Indian low-cost operators.

Semi-continuous

Forfeeds in cells or auto-fed chambers while the reactor holds temperature — an efficiency gain over batch, still limited in scale-up.Examples: Scandinavian Enviro Systems, PRTI, Tyrebirth.

Continuous rotary kiln

The most widely deployed continuous process; a rotating kiln with controlled heating. The CRR/Klean design at Bukowno is heated by its own syngas — 100% self-fuelled — built for steady state and product consistency.Examples: Klean/CRR (Bukowno), Niutech, Polimix Ambiental.

Auger / extruder

Feed moves through a heated screw or extruder; efficient heat transfer, but abrasion and blockage are the recurring operational failures.Examples: Alpha Carbone, Enrestec, Bolder Industries.

Molten bath

Indirect heat transfer through a molten-salt or molten-metal bath — excellent heat transfer and temperature control, but salt handling, corrosion and scaling are the recurring limits.Examples: Contec (Poland, molten salt), a minority approach.

Microwave (experimental)

Dielectric excitation heats the tire material directly rather than the reactor wall — fast start-up and low thermal inertia, but historically confined to experimental and pilot scale.Examples: Elysium Nordic (Denmark), operating Environmental Waste International's patented "Reverse Polymerization" microwave process — developed since 1992 yet still pre-revenue at pilot scale; several research-stage efforts.

Operator vs. owner

The distinction that matters most to a buyer is not which technology family a plant uses, but who holds the rights to it. In this market it is common for one company to operate a plant while a different company owns and licenses the process inside it. The two roles carry different value, different liability, and different contractual weight.

A plant that runs is proof of operation. A technology licence that has been independently adopted — or, better, confirmed by a court — is proof of ownership. Our ranking weighs both, and keeps them separate.

The Bukowno case, as precedent

The clearest public example sits in Bukowno, Poland. The continuous rotary-kiln process there — heated by its own syngas, 100% self-fuelled — was developed by Carbon Resources Recovery GmbH (CRR). When the ownership of that technology was disputed, a final and binding injunction (February 2019, affirmed by the Berlin Court of Appeal in March 2020) held that CRR's technical and scientific know-how "represented the essential core of the functioning of the plant in Bukowno." CRR was acquired by Klean Industries in 2019, and the technology is now licensed globally through KBR. The process is covered by European patent EP4162010 and international application WO2021250103A1, both verifiable on the EPO and WIPO registers.

It is the cleanest worked example in the sector of a court separating the operator from the owner — and the reason our profiles name each explicitly.

Choosing technology

There is no universally best reactor; the choice is project-specific. But the decision factors are stable, and we apply them in every profile:

Factor	Why it matters
Technology readiness	Demonstration-scale (TRL 7–8) plants are not yet de-risked for industrial finance.
Ownership & IP	Confirmed ownership and a licensable position determine who can actually deliver a plant — and who can stop others claiming to.
Operating proof	A running plant with a reported financial result outweighs announced capacity.
Product quality	Spec-grade rCB (ASTM D36, REACH, ISCC) is what unlocks the tire and MRG markets.
Turnkey delivery	EPCC capability — not just a reactor — is what a buyer actually procures.

Sources

ASTM D8178 — Standard Terminology Relating to Recovered Carbon Black (rCB).
Notch / Wolfersdorff, "Prospects for Recovered Carbon Black" (3rd ed., 2024) — technology-family classification.
Landgericht Berlin, injunction order of 26 February 2019 (case no. 91 O 1319/19); affirmed final and binding by the Kammergericht Berlin, 13 March 2020 (case no. 12 U 169/19).
KBR adds tire-recycling advanced technology to its portfolio (2025).
Patents and process know-how — WO2021250103A1 (WIPO) and EP4162010 (EPO register).