Tyres vacuum pyrolysis

GC-MS and GC-AED techniques were used for the direct analysis of used tyre vacuum pyrolysis oil [255]. Antioxidants and antiwear additives (0.25-5 wt% DODPA, a-NPA, TCPs, TPP, IPPs) in lubricating synthetic oils, essentially esters of branched-chain alcohols such as pentaerythritol, neopentylglycol and trimethylolpropane, were determined by means of GC-SIM-MS using diphenylamine (DPA) as an internal standard [256] similarly, TCPs, TPP, IPPs, DPs and I2P were quantitatively analysed by GC-FPD using triethylphosphate (TEP) as an internal standard. RSD values of 3-6% were reported for GC-SIM-MS, and 7-9 % for GC-FPD. 

Roy et al. [11] carried out vacuum pyrolysis of used tyres, with a bench-scale reactor and with cross-ply tyres as feedstock. When the pyrolysis of rubber is carried out under vacuum the spectrum of quality products obtained is distinct from the usual atmospheric... 

Figure 4.35 Pilot plant for the vacuum pyrolysis of used tyres.129...

Sahouli, B., et al.. Surface morphology and chemistry of commercial carbon black and carbon black from vacuum pyrolysis of used tyres. Fuel, 75(10), 1244-1250 (1996). 

When a completely non-oxidising atmosphere is used (i.e., vacuum pyrolysis), it is also possible to recover carbon black from the tyre rubber. This is called pyrolytic carbon black (PCB) and it has the potential to be used in new rubber products (Section 8.2.3). 

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