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5. Pyrolysis
This technique is mainly used to treat end-of-life tires. It involves treating waste rubber (ELT in particular) at high temperature (350°C – 750°C) in the absence of oxygen. Three types of product are obtained, the proportions of which vary according to the pyrolysis temperature:
a gas ;
an oil ;
a solid.
The gas, made up of various hydrocarbons, is used to produce the heat or electrical energy required for the pyrolysis process.
Oil is made up of a hundred different products. It can be used as a fuel (similar to kerosene). Trials have been conducted to use this oil as a plasticizer in a rubber compound. It contains interesting products, in particular limonene (an isoprene dimer), but recovery by separation is tricky....
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Pyrolysis
Recycled rubber for cutting thermoplastic polymers
Bibliography
Websites
Lehigh Technologies
https://www.lehightechnologies.com
Northstar Elastomers – Tirecycle™ process
LEVGUM process – YouTube video
Patents
Chemplast – GumTec – EP 1362 681 – 04/06/2002
Goodyear – Novotny – US 4104205 (1978)
Hunt – US 5578700 (1996)
Vredenstein – US 5425 904 – 05/12/90
Michelin – EP 2337693 – 06/29/2011
LEVGUM LTD – US 6831109 – 04/26/2001
Zhang Yuncan – US 20090082475 – 09/22/2008
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Directory
Ademe (France)
AGR (Italy)
Aliapur (France)
Alfyma (France)
Alpha Recyclage (France)
Birla (United States)
Bolder (United States)
Bridgestone (Japan)
BTCR (Netherlands)
Cabot (US)
...
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