Abstract
This work presents the results of thermogravimetric analysis of decantoil. The microstructure of the extracted petroleum coke during the thermolysis of decantoil in an inert nitrogen atmosphere at 1000 °C was studied by scanning electron microscopy and interpreted as acicular. The model free kinetic approach based on Friedman’s isoconversion method was used to calculate the kinetic characteristics of decantoil thermolysis-activation energy and pre-exponential factor. The individual hydrocarbon composition of decantoil was determined by gas chromatography mass spectrometry, which was used to determine the activation energy of evaporation of its fractions. The total energy spent on the chemical reactions of cracking and thermopolycondensation was determined when the degree of decantoil conversion was changed from 0.1 to 0.9.
Highlights
Delayed coking is an industrial process for the production of petroleum coke, which makes it possible to make refining more profound up to 98%.1,2 The most popular type of petroleum coke is needle coke, which is a petroleum carbon material with a developed fiber anisotropy
A number of works in recent years have been devoted to the influence of the hydrocarbon composition of decantoil on the thermolysis process,[11−14] showing, for instance, that a higher content of polycyclic aromatic substances can accelerate the formation of an anisotropic phase, and olefins can destroy its crystal structure
To determine the kinetics of decantoil thermolysis, a nonisothermal technique was used with the application of various heating rates
Summary
Delayed coking is an industrial process for the production of petroleum coke, which makes it possible to make refining more profound up to 98%.1,2 The most popular type of petroleum coke is needle coke, which is a petroleum carbon material with a developed fiber anisotropy. Decantoil is a heavy distillate feedstock with low sulfur and metal content, which consists of polycyclic aromatic hydrocarbons with 2−5 aromatic rings and has a low content of heptane-insoluble (HI) compounds.[10] A number of works in recent years have been devoted to the influence of the hydrocarbon composition of decantoil on the thermolysis process,[11−14] showing, for instance, that a higher content of polycyclic aromatic substances can accelerate the formation of an anisotropic phase, and olefins can destroy its crystal structure They do not provide the results of evaluating the kinetics of the formation of petroleum needle coke with quantitative results of the activation energy expended at various stages of the thermolysis process and allowing a better interpretation of the mechanism of chemical reactions, including from the point of view of the individual hydrocarbon-type composition. 3) the activation energies of secondary reactions of contraction and thermopolycondensation of raw materials, causing the formation of coke, are 2.2−2.6 times higher than the activation energies of primary coking reactions[32] (60−90 or 251−377 kJ/mol)
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