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EFFECTS OF SAMPLE MASS AND HEATING RATE ON THE OXIDATION BEHAVIOR OF CRUDE OIL USING ALUMINA OR SILICA AS SOLID MATRIX

M.A. Varfolomeev, Dr. Chengdong Yuan, Dmitrii Emelianov

Abstract

Alumina and silica are commonly used as solid matrix for characterizing the combustion behavior of crude oils by differential scanning calorimetry (DSC) technique. However, the two basic factors, heating rate and total sample mass, were paid less attention in the process of experiments. Our recent study found that they might significantly change the oxidation behavior due to the use of alumina and silica as solid matrix. In this study, the effects of heating rate and sample mass on the combustion behavior of crude oils in the presence of alumina or silica were investigated by DSC technique. It turned out that an overlarge or too small mass could lead to a twisted DSC curve that couldnпїЅt reflect the nature of the oxidation of crude oils. Simultaneously, it was found that this kind of twist effect are also affected by heating rate. The reduction of heating rate could weaken the twist effect caused by an overlarge sample mass and normalize the DSC curves. These results indicated that the use of alumina or silica requires an appropriate sample mass and heating rate. What is more, it is necessary to find an optimum sample mass that can be used at different heating rates as the kinetic calculation requires DSC data from at least three different heating rates. The significant finding in this research can provide guidance for characterizing oxidation behavior in the presence of solid matrix (alumina, silica or rock) using DSC techniques as well as other thermal analysis methods including thermogravimetric analysis and accelerating rate calorimeter, etc.

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DOI resolver: doi.org/10.5593/sgem2017h/15/s06.017

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