Research of the kinetic and reaction mechanism of the pyrolys process of oil-based carbonate drill sludge

This article studies the physicochemical parameters of drill cuttings pyrolysis. The pyrolysis of petroleum-based carbonate drill cuttings (CDC) was studied using a thermogravimetric analyzer and a vacuum tube furnace, and the main reaction temperature range is 350-550°C. Using data from the pyrolysis process, the average activation energies were calculated using four model-free methods. Using model-free analysis methods, it was revealed that pyrolysis is a multi-stage process that consists of at least three stages. Using the Friedman method, it was established that the beginning of the process of destruction of CDC occurs in the diffusion region. The values of the Arrhenius kinetic parameters were determined depending on the residual mass of the sample. The obtained parameter values were used as initial data to determine the kinetic model using the nonlinear regression method. The results of this study were 185,5 kJ/mol, 184,16 kJ/mol, 166,17 kJ/mol and 176,03 kJ/mol. The reaction mechanism of CDC pyrolysis was predicted by the Criado method (Z-masterplot). The Z-masterplot method is used to determine the reaction mechanism of the complex feedstock in this work, oil-based carbonate drill cuttings. The most appropriate model of the reaction mechanism can be obtained by comparing the results of the proposed kinetic model with experimental data. It has been found that high heating rates help predict the reaction mechanism, but cannot be described by a single reaction model. The process of transformation of the CDC pyrolysis model at different heating rates was also determined. It has been established that the reaction mechanism of CDC is very complex at lower heating rates. Contribution of the authors: the authors contributed equally to this article. The authors declare no conflicts of interests.

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