| PET | polyethylene terephthalate |
| BHET | bis (2-hydroxyethyl terephthalate) |
| DBTP | dibuthyl terephthalate |
| DMT | dimethyl terephthalate |
| EG | ethylene glycol |
| HEB | 2-hydroxyethyl benzoate |
| MDI | diphenylmethane diisocyanate |
| MHET | methyl-(2-hydroxyethyl) terephthalate |
| rBHET | recycled bis (2-hydroxyethyl terephthalate) |
| rPET | recycled polyethylene terephthalate |
| rTPA | recycled terephthalic acid |
| TBAB | tetrabutylammonium bromide |
| TBAI | tetrabutylammonium iodide |
| TDI | 2,4-Toluene diisocyanate |
| TOMAB | trioctyl ammonium bromide |
| TPA | terephthalic acid |
| X | conversion of PET |
| Wo | initial weight sample |
| W | weight t during pyrolysis |
| We | weight the end of the reaction |
| Ea | activation energy |
| A | preexponential factor |
| T | temperature |