Table 6. Product Gas and Oil Yields (wt %) from the Supercritical Water Liquefaction of Different Mixtures of Plasticsa.
| plastic mixture |
||||
|---|---|---|---|---|
| PP–PS | PP–LDPE | LDPE–PS | PP–LDPE–PS | |
| gas yield | 2.1 | 2.3 | 1.9 | 2.2 |
| oil yield | 96.9 | 97.0 | 97.2 | 96.4 |
| solid | 1.1 | 0.6 | 0.9 | 1.3 |
| mass balance | 100.1 | 99.9 | 100.0 | 99.9 |
Process conditions: plastic:water ratio of 1:4, temperature of 450 °C, and final pressure of 33 MPa with a residence time of 60 min.