TY - JOUR
T1 - Effects of heating rate and temperature on product distribution of poly-lactic acid and poly-3-hydroxybutyrate-co-3-hydroxyhexanoate
AU - Shao, Zhuze
AU - Kumagai, Shogo
AU - Kameda, Tomohito
AU - Saito, Yuko
AU - Yoshioka, Toshiaki
N1 - Funding Information:
This research was supported by the Environment Research and Technology Development Fund [JPMEERF21511901] of the Environmental Restoration and Conservation Agency of Japan. We would also like to thank Kaneka Co. Ltd. for supplying the PHBH samples.
Publisher Copyright:
© 2022, The Author(s).
PY - 2023/3
Y1 - 2023/3
N2 - In this study, poly-lactic acid (PLA) and poly-3-hydroxybutyrate-co-3-hydroxyhexanoate (PHBH) were pyrolyzed at various temperatures (300, 350, 400, 500, 600, and 700 °C) and heating rates (5, 10, 20, 30, and 40 °C min−1) using a pyrolysis–gas chromatograph/mass spectrometer (Py–GC/MS). The results revealed that the main pyrolysis products of PLA were acetaldehyde, lactide (including meso-lactide and d-, l-lactide), and oligomers. Crotonic acid and its oligomers accounted for most of the PHBH pyrolyzates. The pyrolysis temperature significantly correlated with the product distribution, but the heating rate had a small effect on the product distribution. Lactide and crotonic acid were two kinds of high-value chemicals, and their highest yields were obtained at 400 and 600 °C with 29.7 and 72.6 area %, respectively. Secondary reactions could not be neglected at 700 °C, and acetaldehyde and crotonic acid decreased to 65.0 and 69.6 area %, respectively. These results imply that pyrolyzate selectivity can be controlled by temperature management during pyrolysis.
AB - In this study, poly-lactic acid (PLA) and poly-3-hydroxybutyrate-co-3-hydroxyhexanoate (PHBH) were pyrolyzed at various temperatures (300, 350, 400, 500, 600, and 700 °C) and heating rates (5, 10, 20, 30, and 40 °C min−1) using a pyrolysis–gas chromatograph/mass spectrometer (Py–GC/MS). The results revealed that the main pyrolysis products of PLA were acetaldehyde, lactide (including meso-lactide and d-, l-lactide), and oligomers. Crotonic acid and its oligomers accounted for most of the PHBH pyrolyzates. The pyrolysis temperature significantly correlated with the product distribution, but the heating rate had a small effect on the product distribution. Lactide and crotonic acid were two kinds of high-value chemicals, and their highest yields were obtained at 400 and 600 °C with 29.7 and 72.6 area %, respectively. Secondary reactions could not be neglected at 700 °C, and acetaldehyde and crotonic acid decreased to 65.0 and 69.6 area %, respectively. These results imply that pyrolyzate selectivity can be controlled by temperature management during pyrolysis.
KW - Poly-3-hydroxybutyrate-co-3-hydroxyhexanoate
KW - Poly-lactic acid
KW - Pyrolysis
KW - Pyrolysis–gas chromatograph/mass spectrometer
KW - Temperature effects
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U2 - 10.1007/s10163-022-01573-9
DO - 10.1007/s10163-022-01573-9
M3 - Article
AN - SCOPUS:85144399672
SN - 1438-4957
VL - 25
SP - 650
EP - 661
JO - Journal of Material Cycles and Waste Management
JF - Journal of Material Cycles and Waste Management
IS - 2
ER -