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Copyrolysis Behavior of Xylan and Polyvinyl Chloride Plastic

Wang, Wanli, Sun, Kai, Ali, Mujahid, Liu, Xiaoji, Huang, Qunxing
Energy & fuels 2019 v.33 no.9 pp. 8727-8734
Lewis bases, activation energy, alcohols, aldehydes, fuels, gas chromatography-mass spectrometry, oils, plastics, poly(vinyl chloride), pyrolysis, synergism, temperature, thermography, thermogravimetry, xylan
Copyrolysis behaviors of xylan and polyvinyl chloride (PVC) with different mass ratios were experimentally investigated via thermogravimetric analysis and a fixed-bed reactor. Several species of pyrolysis products were detected through Py-GC/MS. Differential thermography results of the mixtures showed obvious deviations, indicating synergistic effects to promote the reaction to occur at a lower temperature but a slower rate, in ranges of 4–39 °C and 0.42–9.68%/min, respectively. The fixed-bed experiments indicated that the interaction could promote char yields by 1.1 to 6.4% and reduce oil yields by 0.2 to 2.9%. The activation energy (E) of mixtures showed a deviation compared with the calculated values, in a range of 13.7–26.2 kJ/mol, indicating interactions to promote the occurrence of copyrolysis. Through the Py-GC/MS results, the synergistic effect was observed to reduce the aromatic components by 2.05 to 15.53% and increase oxygenated compounds in a range of 0.29 to 16.91%. One compound named dl-2-ethylhexyl chloroformate was detected in oil of the mixture, accounting for 5.93% of the products. The addition of PVC could convert the aldehyde and ketone to the alcohol through the nucleophilic addition reaction of the carbonyl.