JMB

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pISSN 1017-7825

Table. 1.

Table. 1.

Degradation product types and yields obtained from PET using various PET degradation processes.

Process Substrate Product Yield Reference
Pyrolysis PET bottle sheets1 Solid
Gas
35.67 wt%
40 wt%
[22]
PET water bottles with rice husk Gas
Biocrude
char
39.9-68.9 wt%
12-29%
15.7-31.7%
[23]
PET bottles2 Gas
Oil
Solid residue
13.3±0.6 wt%
46.7±1.9 wt%
39.7±1.6 wt%
[24]
Pure PET pellets Gas: CO, CO2
Solid: TPA
-
25%
[25]
Gasification Virgin PET pellets Gas: H2, CO2, CO
Char
Tar
90.93 wt%
6.15 wt%
2.9 wt%
[29]
Virgin PET pellets Gas: H2
CO2
Biphenyl
- [28]
Depolymerization
Aminolysis Post-consumer PET
DHTA
BHTA
BFTA
DAA
64%
91%
82%
61%
[34]
PET flakes Monomers, Dimers, Trimers, Oligomers - [35]
Methanolysis PET DMT 89.1% [39]
PET DMT
EG
78%
76%
[37]
PET DMT
EG
95% [38]
PET DMT
EG
91% [40]
PET DMT
EG
93.5% [41]
Glycolysis PET BHET 80.30% [46]
PET BHET 70% [49]
Post-consumer PET bottles TPA
MHET
BHET
62.79-80.66%
17.22-34.79%
0.54-0.59%
[50]
PET bottles BHET, TPA, EG Quantitative [51]
Biological depolymerization PET BHET
EG
68.6% [45]
Post-consumer PET waste TPA 49±2% [76]
Amorphous PET TPA 16.7 g/L/h [79]
Chemoenzymatic depolymerization PET BHET
MHET
PET oligomers
84.8%
7.7%
8.7%
[8]
PET BHET 35% [47]
PET TPA
EG
99.9% [3]

Note: DHTA, dihexylterephthalamide; BHTA, bis(2-hydroxyethyl) terepthalamide; BFTA, bis(furan-2-ylmethyl) terepthalamide; DAA, diallyterepthalamide; DMT, dimethyl terephthalate; TPA, terephthalic acid; BHET, bis(2-hydroxyethyl) terephthalate; MHET, mono-(2-hydroxyethyl) terephthalate; EG, ethylene glycol.

1-solid products contained benzoic acid, 4-vinyl benzoic acid, monovinyl terephthalate, and divinyl terephthalate.

2-Oil components include paraldehyde (54.7 wt%), ethylene glycol (23.65 wt%), and benzoic acid and benzoates (11.5 wt%). The solid carbonaceous residue contained carbon, ash, nitrogen, and sulfur). Gas contained CO and CO2 (more than 90 vol%), a few C1 -C 4 hydrocarbons (~7 vol%), and hydrogen (~3 vol%).

J. Microbiol. Biotechnol. 2023;33:1~14 https://doi.org/10.4014/jmb.2208.08048
© J. Microbiol. Biotechnol.