Cracking of heavy oils using catalytic additives based on coal fly ash ferrospheres

Головко, А. К.; Kopytov, M. A.; Sharonova, O. M.; Kirik, N. P.; Anshits, A. G.

doi:10.1134/s2070050415040078

Cited by 23 publications

(8 citation statements)

References 11 publications

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“…The procedure of catalyst synthesis was thoroughly described in [82]. In [83], the activity of redox catalysts based on ferrospheres in cracking of two heavy oil types (paraffinic and asphaltenic), as well as fuel oil fraction of the paraffinic type of crude oil was investigated in reservoir conditions. Selectivity of generating liquid products for paraffinic crude was 95-96% at 450 • C in the presence of 10 wt% ferrospheres, while for asphaltenic crude oil under the same conditions was 72%.…”

Section: Oil-soluble Catalystsmentioning

confidence: 99%

In-Situ Heavy Oil Aquathermolysis in the Presence of Nanodispersed Catalysts Based on Transition Metals

et al. 2021

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The aquathermolysis process is widely considered to be one of the most promising approaches of in-situ upgrading of heavy oil. It is well known that introduction of metal ions speeds up the aquathermolysis reactions. There are several types of catalysts such as dispersed (heterogeneous), water-soluble and oil soluble catalysts, among which oil-soluble catalysts are attracting considerable interest in terms of efficiency and industrial scale implementation. However, the rock minerals of reservoir rocks behave like catalysts; their influence is small in contrast to the introduced metal ions. It is believed that catalytic aquathermolysis process initiates with the destruction of C-S bonds, which are very heat-sensitive and behave like a trigger for the following reactions such as ring opening, hydrogenation, reforming, water–gas shift and desulfurization reactions. Hence, the asphaltenes are hydrocracked and the viscosity of heavy oil is reduced significantly. Application of different hydrogen donors in combination with catalysts (catalytic complexes) provides a synergetic effect on viscosity reduction. The use of catalytic complexes in pilot and field tests showed the heavy oil viscosity reduction, increase in the content of light hydrocarbons and decrease in heavy fractions, as well as sulfur content. Hence, the catalytic aquathermolysis process as a distinct process can be applied as a successful method to enhance oil recovery. The objective of this study is to review all previously published lab scale and pilot experimental data, various reaction schemes and field observations on the in-situ catalytic aquathermolysis process.

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Section: Oil-soluble Catalystsmentioning

confidence: 99%

In-Situ Heavy Oil Aquathermolysis in the Presence of Nanodispersed Catalysts Based on Transition Metals

et al. 2021

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“…The produced FS fractions have the common composition–morphology–microstructure relationship for iron-containing phases; in turn, this suggests that they can be used as functional materials. In particular, narrow fractions of clean FSs separated from industrial coal combustion fly ashes are sufficiently often used as efficient catalysts for deep oxidation, , oxidative coupling of methane (OCM), − and thermolysis of heavy oil and petroleum residue , and as magnetic carriers for isolating recombinant proteins . The properties of microspherical functional materials in each particular case depend on their composition, morphology of globules, crystallite size, and microstructure of active phases.…”

Section: Introductionmentioning

confidence: 99%

Composition–Structure Relationship and Routes of Formation of Blocklike Ferrospheres Produced by Pulverized Combustion of Two Coal Types

2021

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The composition−structure relationship of blocklike ferrospheres (FSs) isolated from fly ash produced during the combustion of two different types of coal was studied systematically by scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. Monoblock globules were shown to consist of large sintered crystallites of Mg, Mn ferrospinel, which are formed from excluded siderite particles containing isomorphic impurities of magnesium and manganese carbonates. The common groups of globules for which the gross composition of polished sections corresponds to the general equations for the relationship of the concentrations SiO 2 = f(Al 2 O 3 ) and CaO = f(SiO 2 ) were highlighted from FSs of two series. These globules are formed during the thermochemical transformation of associates of siderite, quartz, calcite, and anorthite, which have a silicate modulus of SiO 2 /Al 2 O 3 equal to 1.18, which corresponds to the coefficients in the general equations of the relationship SiO 2 = f(Al 2 O 3 ). SEM analysis of polished cross-sections of the globules of selected FS groups demonstrates that the crystallite size of ferrospinel decreases, while the content of the glass phase increases with the declining FeO concentration in individual globules. The crystallite size and shape are found to depend on the size of the local melt area where the concentration of spinel-forming oxides is >85 wt %. The observed increase in the glass-phase content is attributed to the broadening of the liquation zone in the FeO−Fe 2 O 3 −SiO 2 system as the oxidative potential increases and to the higher content of [Fe 3+ O 2 ] − and [Fe 3+2 O 5 ] 4− ferrite complexes in calcium-rich melts.

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“…Vacuum distillates and residual fractions are characterized by a high content of resins and asphaltenes, heteroatomic compounds and metal-containing components (Yakubov et al 2016a, b, c). The development of methods for thermal destruction of resins and asphaltenes with simultaneous production of additional amounts of light fractions without using hydrogen will significantly advance the efficiency of thermal processing of heavy hydrocarbon feedstock and, as a result, produce petroleum products with a lower content of high molecular weight and heteroatomic compounds and a higher content of distillate fractions (Yakubov et al 2016a;Morozov et al 2017;Nassar et al 2011;Golovko et al 2015;Sviridenko et al 2016a, b). Searching of non-conventional methods for conversion of high molecular weight oil compounds requires a study of cracking reactions both in the presence of additives differing in their effects and without them.…”

Section: Introductionmentioning

confidence: 99%

Effect of WC/Ni–Cr additive on changes in the composition of an atmospheric residue in the course of cracking

et al. 2019

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The paper presents the results of investigation of changes in the composition of hydrocarbons and sulfur-containing compounds of an atmospheric residue in the course of cracking in the presence of a tungsten carbide-nickel-chromium (WC/ Ni-Cr) catalytic additive and without it. The cracking is carried out in an autoclave at 500 °C for 30 min. The addition of the WC/Ni-Cr additive promotes the deepening of reactions of destruction not only of resins and asphaltenes, but also high molecular weight naphthene-aromatic compounds of the atmospheric residue. It is shown that the content of low molecular weight C 9-C 17 n-alkanes and C 9-C 10 alkylbenzenes rose sharply in the products of cracking with addition of WC/Ni-Cr in comparison with those produced without the additive. Alkyl-and naphthene-substituted aromatic hydrocarbons of benzene, naphthalene, phenanthrene series, polyarenes, benzo-and dibenzothiophenes are identified.

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Cracking of heavy oils using catalytic additives based on coal fly ash ferrospheres

Cited by 23 publications

References 11 publications

In-Situ Heavy Oil Aquathermolysis in the Presence of Nanodispersed Catalysts Based on Transition Metals

In-Situ Heavy Oil Aquathermolysis in the Presence of Nanodispersed Catalysts Based on Transition Metals

Composition–Structure Relationship and Routes of Formation of Blocklike Ferrospheres Produced by Pulverized Combustion of Two Coal Types

Effect of WC/Ni–Cr additive on changes in the composition of an atmospheric residue in the course of cracking

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