Mechanisms of propylene glycol and triacetin pyrolysis

Teodoro Laino, Christian Tuma, Philippe Moor, Elyette Martin, S. Stolz, Alessandro Curioni

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    Abstract

    Propylene glycol and triacetin are chemical compounds, commonly used as food additives. Though the usage of the pure chemicals is not considered harmful when used as dietary supplements, little is known about the nature of their thermal degradation products and the impact they may have on human health. For these reasons, in this manuscript we investigate the thermal decomposition mechanisms of both neutral propylene glycol and triacetin in the gas phase by a novel simulation framework. This is based on a free energy sampling methodology followed by an accurate energy refinement. Structures, Gibbs free energy barriers, and rate constants at 800 K were computed for the different steps involved in the two pyrolytic processes. The thermal decomposition mechanisms found theoretically for propylene glycol and triacetin were validated by a qualitative experimental investigation using gas-phase chromatography–mass spectroscopy, with excellent agreement. The results provide a validation of the novel simulation framework and shed light on the potential hazard to the health that propylene glycol and triacetin may have when exposed to high temperatures.
    Original languageUndefined
    Pages (from-to)4602-4609
    Number of pages8
    JournalJournal of physical chemistry A
    Volume116
    Issue number18
    DOIs
    Publication statusPublished - 18 Apr 2012

    Keywords

    • EWI-22979
    • IR-83631
    • METIS-296266
    • MACS-MMS: Multiscale Modelling and Simulation

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