Optimization of Ti–BA efficiently for the catalytic alcoholysis of waste PET using response surface methodology

Abstract

A titanium benzoate (Ti–BA) catalyst was prepared by hydrothermal method, which has an ordered eight-face structure, and was used for polyethylene terephthalate (PET) depolymerization.

Ti–Si composite glycol salts: depolymerization and repolymerization studies of PET

“…1 The good stability of PET makes it difficult to naturally depolymerize; therefore, the development of efficient PET recycling technology is of great signicance to alleviate the pressure on the environment. 2,3 Currently, waste PET recycling and reuse methods are divided into three categories: chemical recycling [4][5][6][7][8][9] which is highly efficient in terms of the reagents used to depolymerize PET and is an effective way to realize the sustainable use of plastic recycling; physical recycling, which uses hightemperature melt extrusion to recycle PET for a second time, but the quality index of the recycled PET will be reduced, limiting the number of recycling times and compromising the quality of the recycled product; and biological recycling, [10][11][12][13] which is similar to chemical recycling and depolymerizes PET, but it is more costly. At present, the use of ethylene glycol as a solvent has been reported to depolymerize PET, and the yield of the depolymerization product BHET is mostly in the range of 50-80% and seldom exceeds 90%.…”