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Showing 41-60 of 2,741 results

  1. Nitration of Petroleum Asphaltenes with Concentrated Nitric Acid under Various Conditions

    The relationships of the reaction of the of tar asphaltenes with concentrated nitric acid were studied under various quantitative, temperature, and...

    O. A. Nagornova, L. E. Foss, ... M. R. Yakubov in Chemistry and Technology of Fuels and Oils
    Article 22 September 2021

  2. Adsorption-Extrographic Preconcentration of Petroleum Vanadyl Porphyrins from Dimethylformamide Extract of Heavy Petroleum Asphaltenes

    Abstract

    An adsorption-extrographic method was developed for preconcentration of petroleum vanadyl porphyrins from the dimethylformamide (DMF) extract...

    N. A. Mironov, E. G. Tazeeva, ... M. R. Yakubov in Russian Journal of Applied Chemistry
    Article 01 September 2021

  3. Structural Transformations of Heavy Oil Resins and Asphaltenes upon Thermal Cracking

    Abstract

    Structural changes in resins and asphaltenes in the course of their separate and combined cracking were studied. Cracking was carried out in...

    N. G. Voronetskaya, G. S. Pevneva in Solid Fuel Chemistry
    Article 01 May 2021

  4. Extraction of Highly Condensed Polyaromatic Components from Petroleum Asphaltenes

    Abstract

    The paper reports the results of the fractional extraction of petroleum asphaltenes using a toluene/acetone mixture. This method was...

    Yu. Yu. Borisova, L. I. Musin, ... M. R. Yakubov in Petroleum Chemistry
    Article 22 April 2021

  5. Redistribution of Asphaltenes in Modeling of a Nonequilibrium Reservoir State

    Abstract

    The paper describes a process of crude oil differentiation in an oil reservoir induced by an inflow of light hydrocarbons. It was shown...

    E. S. Okhotnikova, Yu. M. Ganeeva, ... T. N. Yusupova in Petroleum Chemistry
    Article 28 May 2021

  6. Separation of Archipelago- and Continent-Type Asphaltenes on Ultrafiltration Membranes

    Abstract

    Asphaltenes, which are macromolecular compounds contained in heavy oils, tend to aggregate and precipitate, thereby causing a number of...

    A. A. Yushkin, A. V. Balynin, ... A. V. Volkov in Membranes and Membrane Technologies
    Article 01 March 2021

  7. Effects of the Composition and Molecular Structure of Heavy Oil Asphaltenes on Their Reactivity in Thermal Decomposition Processes

    Abstract

    This study investigated, for the first time, thermal transformations of heavy oil asphaltenes using a stepwise thermal decomposition...

    D. S. Korneev, G. S. Pevneva, N. G. Voronetskaya in Petroleum Chemistry
    Article 12 February 2021

  8. Reduction of asphaltenes adsorbed on kaolinite by polymers based on cardanol

    Oilsands are suspended fine solids in bitumen in which asphaltenes become adsorbed on the surfaces of these particles, reducing the quality of the...

    Tatiana S. L. Maravilha, Antonieta Middea, ... Elizabete F. Lucas in Brazilian Journal of Chemical Engineering
    Article 23 November 2020

  9. Oxidation of Petroleum Asphaltenes Coupled with Iodination

    Oxidation of petroleum asphaltenes by potassium iodide (KI) is described. Oxidation under mild conditions is shown to be accompanied by iodination of...

    K. V. Shabalin, L. E. Foss, ... D. N. Borisov in Chemistry and Technology of Fuels and Oils
    Article 01 September 2020

  10. Effects of the Composition and Molecular Structure of Asphaltenes on the Properties of Heavy Petroleum Feedstock Represented by Heavy Oil from the Ashalchinskoye Field and Two Vacuum Residue Samples

    Abstract

    A combination of analytical methods (including CHNS-O elemental analysis, X-ray diffraction, 1 H and 13 C NMR spectroscopy, MALDI-TOF and ICP...

    D. I. Panyukova, R. N. Magomedov, ... T. A. Maryutina in Petroleum Chemistry
    Article 27 April 2021

  11. Adsorption of Algerian Asphaltenes onto Synthesized Maghemite Iron Oxide Nanoparticles

    Abstract

    In this study, the adsorption of Algerian asphaltene sample extracted from Hassi Messaoud oil field is conducted for the first time. The...

    H. Abbas, A. D. Manasrah, ... Y. Bouhadda in Petroleum Chemistry
    Article Open access 02 November 2020

  12. Spectroscopic Analysis of Crude Oil Asphaltenes at Molecular Level

    Abstract

    In the present study, a scientific challenge of determination of various structural parameters of asphaltenes of medium heavy, heavy, and...

    S. Ok, N. Rajasekaran, ... G. A. Joseph in Petroleum Chemistry
    Article 27 July 2020

  13. Composition and Distribution of Microelements in Rocks, Extracts, and Asphaltenes from Domanik Deposits of Various Lithologo-Facial Types of Romashkino Oilfield

    Abstract

    Comparative studies were made of the microelement composition of rock samples from Domanik deposits of different lithologo-facial types:...

    G. P. Kayukova, A. N. Mikhailova, ... A. V. Vakhin in Petroleum Chemistry
    Article 01 May 2021

  14. Modeling of the Reactivity of Asphaltenes in Electrophilic Substitution Reactions

    Quantum-chemical modeling of the spatial and electronic structure of asphaltenes containing different numbers of electron-withdrawing substituents...

    K. V. Shabalin, V. V. Neklyudov, ... D. N. Borisov in Chemistry and Technology of Fuels and Oils
    Article 01 September 2020

  15. Molecular Basis of Asphaltene Stability

    Abstract

    The instability of asphaltenes in crude oils, manifested in their precipitation, is a major production issue that may arise both during the...

    E. S. Okhotnikova, Yu. M. Ganeeva, ... D. S. Ivanov in Petroleum Chemistry
    Article 08 July 2024

  16. Thermolysis of Asphaltenes of Timan–Pechora Heavy Oils

    Abstract

    The hydrocarbon composition of the thermolysis products of asphaltenes from biodegraded oils of the Labagan and Usa oilfields and...

    N. S. Burdel’naya, D. A. Bushnev, ... V. A. Radaev in Petroleum Chemistry
    Article 01 June 2020

  19. Structural Features of Particles of Goudron CO2 Asphaltenes Precipitated with Various Organic Diluents

    Transmission electron microscopy (TEM) was used to study the structure of particles of CO 2 -asphaltenes precipitated from a goudron vacuum residue...

    R. N. Magomedov, A. V. Pripakhailo, ... T.A. Maryutina in Chemistry and Technology of Fuels and Oils
    Article 01 July 2020

  20. Effect of Interactions between Saturates-Aromatics-Resins-Asphaltenes Components on the Oxidation Behavior and Kinetics of Heavy Crude Oil

    Abstract

    In this paper, the particular attention was placed on the effect of interactions between saturates (S), aromatics (A), resins (R), and...

    Shuai Zhao, Wanfen Pu, ... M. A. Varfolomeev in Petroleum Chemistry
    Article 27 November 2020
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