The oil production rate, gas production rate and tire oil quality from tire pyrolysis are directly related to the type of waste tires and the operation temperature of pyrolysis. As pyrolysis operation temperature of waste tires increases, the oil production rate increases, the carbon black yield decreases, and the gas production rate increases. The sulfur content in the tire oil increases accordingly, and the density of the tire oil also increases.
At the same temperature, the main components of fuel oil are aromatic compounds with carbon atoms greater than C7, accounting for more than 75% of the entire oil. The recovered oil has a similar composition to coal tar and can be fractionated into a variety of aromatic compounds.
Relevant laboratory test data are as follows:
Products ratioes at different pyrolysis temperature
Temperature ℃ | Oil % | Gas % | Carbon black % | Steel wires % |
450～550 | 33. 1～35. 4 | 8. 5～8. 9 | 46. 2～49. 2 | 9. 4～9. 5 |
550～650 | 41. 3～42. 5 | 9. 9～10. 3 | 38. 0～39. 2 | 9. 4～9. 5 |
650～750 | 43. 2～45. 1 | 10. 2～10. 4 | 35. 1～37. 1 | 9. 4～9. 5 |
Sulphur content with pyrolysis temperature change
Temperature℃ | Sulphur content in carbon black% | Sulphur content in oil % |
450～550 | 2. 25 | 1. 18 |
550～650 | 2. 14 | 1. 75 |
650～750 | 2. 00 | 1. 80 |
Note: Sulphur content in waste tires are generally 1.48%
Component change in pyrolysis oil at different pyrolysis temperature
Temperature℃ | <C7 % | <C7-<C12 % | >C7 % |
450～550 | 22. 90 | 31. 84 | 45. 26 |
550～650 | 16. 38 | 36. 99 | 46. 26 |
650～750 | 15. 36 | 37. 63 | 47. 01 |
