Using a refracto-densimetric method for control of secon­dary oil-refining processes: Hydrotreating and hydrocracking

V.F. Nikolaev a*, R.K. Nurgaliev a**, N.D. Zalaltdinova a***, I.O. Vyachkileva b****, O.O. Kolonenkova a*****, R.B. Sultanova a******

aKazan National Research Technological University, Kazan, 420015 Russia

bAO “TANECO”, Nizhnekamsk, 423570 Russia

E-mail: *mobin7@yandex.ru, **nurgalievr@gmail.com, ***nursina2013@yandex.ru, 

****vyachkileva_io@taneco.ru, *****kolonenkova.o@yandex.ru, ******rasimabaky@mail.ru

Received September 11, 2019

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DOI: 10.26907/2542-064X.2019.4.607-619

For citation: Nikolaev V.F., Nurgaliev R.K., Zalaltdinova N.D., Vyachkileva I.O., Kolonenkova O.O., Sultanova R.B. Using a refracto-densimetric method for control of secondary oil-refining processes: Hydrotreating and hydrocracking. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2019, vol. 161, no. 4, pp. 607–619. doi: 10.26907/2542-064X.2019.4.607-619. (In Russian)

Abstract

The possibility of using flow refractometers and densimeters or refracto-densimetric analyzers to study the quality of diesel fuels obtained in the processes of hydrotreating and hydrocracking of raw materials was discussed.

The results of the research show that on the basis of primary analytical signals – refractive index and density – it is possible to visualize the dynamics of time-related changes in the group (component, hydrocarbon) composition of the controlled flow of the output product (diesel fuel) on a 2D identification map constructed in the coordinates “Lorentz–Lorenz specific refraction sR – Kurtz refraction intercept RI”.

The refracto-densimetric analysis of the samples of raw materials and final products of hydrotreating, hydrocracking, and fractionation, which were performed at the “TANECO” Company, revealed the possibility of simple control of the course of chemical processes and visualization of changes in the group hydrocarbon composition of raw materials and products on the identification map, broadcast in real time on the monitors of the control center. The possibility of integrating refracto-densimetric analyzers into the existing control and regulation systems of the main process parameters (hydrogen gas pressure, catalyst temperature, raw material temperature, contact time, etc.) to maintain the quality of the output product at the required level was considered.

Keywords: refractive index, density, specific refraction, refractive intercept, diesel fuel, jet fuel, hydrocracking, hydrotreating, conversion rate, automation

Acknowledgements. The research was supported by the Russian Foundation for Basic Research and the Government of the Republic of Tatarstan (project no. 18-47-160008).

We are grateful to the management team of the “TANECO” Company for the opportunity to collect the samples of raw materials and products of hydrotreating and hydrocracking, as well as for providing us with the related technical data.

Figure Captions

Fig. 1. Identification map of the main homologous series of organic compounds. Designations: quadrant I – olefins, mono-, bi-, and polynuclear aromatic hydrocarbons, quadrant II – saturated hydrocarbons (normal hydrocarbons and isoparaffins), quadrant III – alkylcycloalkanes, oxygen-containing compounds (aldehydes, ketones, alcohols, carboxylic acids), organic compounds containing sulfur S and nitrogen N heteroatoms, wood chemistry products, quadrant IV – mixtures of components from quadrants I and III, heavy oil residues.

Fig. 2. The course of the hydrotreating process for diesel fuel with reference points (n-decylcyclohexane, n-decylbenzene, n-hexadecane).

Fig. 3. The course of hydrogenolysis processes for individual heteroatomic organic compounds.

Fig. 4. The course of the hydrocracking process for vacuum gas oil with reference points (cyclohexane, n-decylbenzene, n-hexadecane).

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