Table 5. Compounds Identified by GC-MS/MS in the Product Oil from the Supercritical Water Liquefaction of Low-Density Polyethylene at Conditions of 450 °C and Final Pressure of 33 MPa with a Residence Time of 60 min and Plastic:Water Ratio of 1:4a.
| retention time (min) | peak area (%) | compound | concentration (mg g–1 of LDPE) |
|---|---|---|---|
| 4.044 | 2.105 | 1-ethyl-3-methylcyclopentane | 16.58 |
| 4.138 | 5.67 | C8 octane | 44.65 |
| 4.181 | 1.173 | 1,3-dimethylcyclohexane | 9.24 |
| 4.277 | 1.478 | 1,4-pentadiene, 2,3,4-trimethyl | 11.64 |
| 4.701 | 1.163 | 1,2-dimethylcyclohexane | 9.16 |
| 4.757 | 0.883 | 2-methylethyl cyclohexane | 6.95 |
| 5.197 | 1.362 | ethylbenzene | 10.73 |
| 5.359 | 4.299 | p-xylene | 33.85 |
| 5.66 | 0.861 | nonadiene | 6.78 |
| 5.742 | 1.022 | cyclohexene, 3,3,5-trimethyl | 8.05 |
| 5.781 | 1.956 | o-xylene | 15.40 |
| 5.908 | 4.756 | n-nonane C9 | 37.45 |
| 7.099 | 1.711 | 1-ethyl-4-methylbenzene | 13.47 |
| 7.166 | 0.98 | benzene, 1-ethyl-2-methyl- | 7.72 |
| 7.689 | 1.148 | decene/decadiene | 9.04 |
| 7.757 | 1.769 | decene/1,3,5-trimethylbenzene | 13.93 |
| 7.862 | 4.187 | n-decane C10 | 32.97 |
| 8.554 | 1.402 | benzene, 2-propenyl/indane | 11.04 |
| 8.978 | 0.973 | benzene, 1,4-diethyl- | 7.66 |
| 9.56 | 1.607 | benzene, 2-propenyl/indane | 12.66 |
| 9.648 | 1.307 | undecane | 10.29 |
| 9.813 | 4.373 | n-undecane C11 | 34.44 |
| 11.529 | 1.536 | dodecane | 12.10 |
| 11.686 | 4.448 | n-dodecane C12 | 35.03 |
| 13.318 | 1.134 | tridecane | 8.93 |
| 13.462 | 3.866 | n-tridecane C13 | 30.44 |
| 15.01 | 1.099 | 7-tetradecene | 8.65 |
| 15.136 | 3.186 | n-tetradecane C14 | 25.09 |
| 16.718 | 2.977 | n-pentadecane C15 | 23.44 |
| 18.214 | 2.483 | n-hexadecane C16 | 19.55 |
| 19.635 | 1.99 | n-heptadecane C17 | 15.67 |
| 20.983 | 1.38 | n-octadecane C18 | 10.87 |
| total | 70.284 | 553.49 |
a
Listed are the highest concentration compounds identified in the oil.