Bull. Spec. CORESTA Congress, Lisbon, 2000, p. 154, ST10

Decomposition kinetics of phenolic compounds in tobacco

Philip Morris USA, Research Center, Richmond, VA, USA
There has been little investigation on the phenolic constituents of tobacco, such as rutin, chlorogenic acid and lignin. Early literature has shown that pyrolysis of these phenolic compounds is generally rapid, with the evolution of volatile products and a solid char residue. These products constituted the primary decomposition step, but as seen with other biomass constituents, secondary reactions continue to occur in the solid matrix. An increased understanding of these polyaromatic decomposition processes may facilitate a greater overall understanding of tobacco decomposition, as well as biomass decomposition in general. In this study, we used a thermogravimetic analyzer (TGA) coupled with a differential scanning calorimeter (DSC) and mass spectrometer (MS) to evaluate the pyrolysis of rutin, chlorogenic acid, lignin and their respective high temperature chars (> 400°C). The peak decomposition temperatures from the respective derivatives of the TGA curves (DTG) allowed the determination of global decomposition kinetic parameters for each compound and their char using the Tmax-model. Likewise, the Tmax-model was also used to determine relevant kinetic parameters for specific evolved products (masses), which included hydrogen (2), methane (15), benzene (78), toluene (92), naphthalene (128), and anathracene/phenanthrene (178). Furthermore, these data will be used to generate a model for the pyrolysis behavior of the specified phenolic compounds.