In this research two Turkish crude oils (medium and heavy) were
separated into their saturate,
aromatic, resin, and asphaltene (SARA) fractions by column
chromatographic techniques, and
combustion experiments were carried out on whole crude oils and their
fractions by thermogravimentric analysis (TD/DTG) under air atmosphere at a 10 °C/min
heating rate. Investigation
of SARA fractions allows quantitative determination of the temperature
intervals at which
evaporation, oxidation, and combustion effects operate for each
fraction. In the course of this
research, the kinetic parameters of SARA fractions were determined
according to the Coats and
Redfern technique. By using the data and findings of this
research, one can take advantage of
studying the kinetics of SARA fractions instead of those of the complex
whole oil for modeling of
the overall process to accurately predict combustion.
Kinetics of oil shale pyrolysis was studied by differential scanning calorimetry and non-isothemal thermogravimetry. In nitrogen atmosphere two different mechanisms causing mass loss were observed: distillation in the region between ambient temperature and 500 K, visbreaking and cracking in the region of 500-800 K. Kinetic parameters of the sample pyrolysis are determined using different kinetic models, and the results are discussed.
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