Formation kinetics of hydrocarbon compounds in the vacuum gas oil oxycracking process
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Formation kinetics of hydrocarbon compounds in the vacuum gas oil oxycracking process E. A. Guseinova1 · K. Yu. Adzhamov1 · L. A. Mursalova2 · S. R. Safarova2 Received: 9 June 2020 / Accepted: 29 July 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The kinetics of the formation of oxygen-free hydrocarbon compounds obtained during the process of oxidation of vacuum gas oil at 450–550 °C for 2700 s of conducting of the process was studied. It was established that the highest rate of hydrocarbon formation was noted for the C1–C4 fraction starting from the moment the process started and up to 900 s (1.76 × 10−8 – 4.58 × 10−8). For other fractions, reaction rate maximums were noted: for C5–C9—300 s from the start of the process; for C10–C12—in the interval between 300 and 900 s, i.e. at 600 s process duration; for the raw fractions C22–C30, C31–C35 and C 36–C40, grew after 1800s. The data on the influence of the process temperature on the rate of hydrocarbon formation allowed us to establish that the oxycracking process is limited by the formation of C10–C16 hydrocarbon fractions. The increase in contact time to a greater extent affects the rate of formation of hydrocarbons C1–C4 and C17–C21. The features of the rate of hydrocarbon production as a function of the amount of oxygen were found out: the rate of formation of hydrocarbons C 1–C4 and C 17–C21 increases with increasing oxygen content (in the case of C17–C21 it passes through a minimum); C5–C9 and C13– C16—monotonously decreases; C 10–C12 passes through a maximum at an oxidation state of 1%, which undoubtedly indicates the role of oxygen in the destructive processes of the formation of hydrocarbons that do not contain oxygen under oxycracking conditions. Keywords Kinetics · Hydrocarbon fractions · Reaction rate · Reaction rate constant · Negative temperature coefficient · Activation energy · Oxycracking · Vacuum gas oil
* E. A. Guseinova [email protected] 1
Azerbaijan State Oil and Industry University (ASOIU), Baku, Azerbaijan
2
ASOIU, Research Institute “Geotechnological Problems of Oil, Gas and Chemistry”, 16/21 Azadlıq av., Baku, Azerbaijan
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Reaction Kinetics, Mechanisms and Catalysis
Introduction The study of the oxidation process of light alkanes is a classic subject of chemical kinetics [1–5]. These processes served as the basis for the development of the theory of radical chain oxidation processes. In industry, mainly oxidative processes of natural gas processing have been developed: whether it is the use of natural gas in the power industry for energy production (with complete oxidation), or the production of petrochemical products (in the course of partial oxidation) [4–8]. The kinetics of both types of methane oxidation processes has been studied quite fully, and the mechanisms are beyond doubt. Undoubtedly, the partial gas-phase separation of hydrocarbons (C10+) implies that the possibilities of light and weak C–H and C–C bonds, as well as the possibility of obtaining a wide rang
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