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Hydrodynamic activation of heavy oil residues

https://doi.org/10.32362/2410-6593-2021-16-5-390-398

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Abstract

Objectives. Recently, there has been a tendency to increase the volume of high-viscosity heavy oils in the total volume of oil produced. The processing of these oils requires new technological approaches. This task is closely related to the need to increase the depth of oil refining. Among the approaches proposed to solve these problems, mechanochemical activation, which is based on the cavitation effect produced by ultrasonic or hydrodynamic methods, has been suggested. This study evaluated the effects of cavitation in increasing the depth of oil refining.
Methods. Straight-run and “secondary” oil products were used as raw materials: vacuum gas oil, catalytic cracking gas oil, and fuel oil. Activation was carried out in a high-pressure disintegrator. The principle of operation was to compress the oil product and then pass it through a diffuser. When the oil was passed through the diffuser, there was a sharp pressure release to atmospheric pressure, which caused cavitation in the hydrodynamic flow. The pressure gradient on the diffuser and the number of processing cycles ranged from 20 to 50 MPa and 1 to 10, respectively. The density, refractive index, and the fractional composition of petroleum products were determined using standard and generally accepted methods.
Results. This paper reports the influence of mechanochemical activation of petroleum products on their physical and chemical characteristics. An increase in the pressure gradient and the number of processing cycles leads to a decrease in the boiling point of the petroleum products and their density and an increase in the yield of fractions that boil off below 400 °C. The yield of the fractions with boiling points of 400–480 °C and the remainder were reduced. The density and refractive index of fractions with boiling points up to 480 °C decreased, and the density of the residue increased. The effects of cavitation (an increase in the yield of fractions with boiling points up to 400 °C and a decrease in the density of the petroleum products) increased with increasing pressure gradient and the number of processing cycles.
Conclusions. The changes in the density, boiling point, and the yield of fractions increased with increasing the pressure from 20 to 50 MPa and the number of hydrodynamic cavitation cycles from 1 to 5. Increasing the number of processing cycles to more than five had little additional effect. The effects of cavitation increased with increasing initial density of the oil product. The average molecular weight of these fractions was estimated from the densities and boiling points of individual fractions of the petroleum products. The calculation confirmed the assumption regarding the course of cracking reactions of petroleum products under the influence of cavitation and indicates the course of the compaction processes.

About the Authors

V. B. Terenteva
The 25th State Research Institute of Himmotology, Ministry of Defence of Russian Federation
Russian Federation

 Engineer

10, Molodogvardeyskaya ul., Moscow, 121467, Russia



B. V. Peshnev
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

 Dr. Sci. (Tech.), Professor, A.N. Bashkirov Department of Petrochemical Synthesis and Artificial Liquid Fuel Technology

86, Vernadskogo pr., Moscow, 119571, Russia



A. I. Nikolaev
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

 Dr. Sci. (Tech.), Professor, A.N. Bashkirov Department of Petrochemical Synthesis and Artificial Liquid Fuel Technology

86, Vernadskogo pr., Moscow, 119571, Russia



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Supplementary files

1. Influence of the activation conditions on the CCG sample density. Pressure gradient, МPа: (1) 20; (2) 30; (3) 40; (4) 50.
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2. This is to certify that the paper titled Hydrodynamic activation of heavy oil residues commissioned to us by Vera B. Terenteva, Boris V. Peshnev, Alexander I. Nikolaev has been edited for English language and spelling by Enago, an editing brand of Crimson Interactive Inc.
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  • The paper reports the influence of the mechanochemical activation of petroleum products on the change in their physicochemical characteristics.
  • Mechanochemical activation of petroleum products resulted in a decrease in the density and boiling point and an increase in the yield of fractions boiling up to 400℃. An increase in the pressure gradient from 20 MPa to 50 MPa and an increase in the number of processing cycles from 1 to 5 led to a significant change in the characteristics.
  • The efficiency of mechanochemical activation on samples of petroleum products increased with increasing initial density of the petroleum product. The average molecular weight of these fractions was estimated from the densities and boiling points of the individual fractions of petroleum products.
  • The calculation confirmed the assumption regarding the course of cracking reactions of petroleum products under the influence of cavitation and indicated the course of the compaction processes.

For citation:


Terenteva V.B., Peshnev B.V., Nikolaev A.I. Hydrodynamic activation of heavy oil residues. Fine Chemical Technologies. 2021;16(5):390-398. https://doi.org/10.32362/2410-6593-2021-16-5-390-398

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)