https://doi.org/10.1021/acsomega.2c05045
“The solid was analyzed for C, H, N, and S using a Vario EL cube type elemental analyzer. ”
”
3.5. Analysis of the Solid
Table 5 shows the elemental analysis of the solid at 450 °C. It can be seen that the elemental oxygen content of the waste carton at single pyrolysis is 38.5%, while the oxygen content under copyrolysis is higher than 40%. It indicates that copyrolysis increases the oxygen content in the solid and decreases the calorific value. H/C also decreased from 0.8 to 0.6, indicating that the hydrogen atoms in the solid product decreased, representing a decrease in volatile fraction in the solid. (39) Unlike waste cartons and PP, incomplete cracking of PE at 450 °C leaves some hydrocarbon molecules in the solids, so the oxygen content in the solids decreases and the hydrogen-to-carbon ratio increases.
Table 5. Elemental Analysis of Solid Products at 450 °C
element composition (wt %) | ||||||
---|---|---|---|---|---|---|
raw material | C | H | O | N | S | H/C (mole ratio) |
waste carton alone | 57.3 | 3.7 | 38.5 | 0.3 | 0.2 | 0.8 |
WC/PP | ||||||
3:1 | 56.4 | 2.8 | 40.1 | 0.2 | 0.5 | 0.6 |
1:1 | 51.8 | 2.6 | 44.8 | 0.3 | 0.5 | 0.6 |
1:3 | 50.7 | 2.6 | 45.9 | 0.4 | 0.5 | 0.6 |
WC/PE | ||||||
3:1 | 51.8 | 2.8 | 44.6 | 0.3 | 0.5 | 0.7 |
1:1 | 52.7 | 4.1 | 42.7 | 0.3 | 0.2 | 0.9 |
1:3 | 65.0 | 7.2 | 27.3 | 0.2 | 0.3 | 1.3 |
“