Thermal and catalytic conversion of asphaltenes

Zhang, C; Lee, C.W; Keogh, Robert A.; Demirel, Belma; Davis, Burtron H.

doi:10.1016/s0016-2361(00)00178-2

Cited by 28 publications

(14 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the extraction and processing of heavy hydrocarbon feedstock, difficulties are inevitable due to the special properties of asphaltenes, which are in this feedstock in the form of associative formation of molecules of different sizes depending on the composition and nature of oil, as well as on the impact of external factors, such as temperature and pressure, on it. ,, The changes in the structure of asphaltenes significantly affect the heavy oil recovery processes.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Hydrothermal Conversion of Heavy Oil in the Porous Media

et al. 2021

View full text Add to dashboard Cite

In this study, the specific features of Ashal’cha heavy oil conversion were revealed. The hydrothermal catalytic experiments were carried out in a CO2 environment and in the presence of oil-soluble carboxylate metals such as Fe, Co, and Cu at the temperature of 300 °C. The results have shown that the catalyst and minerals of reservoir rocks have significant impact on the transformation behavior of group, structural group, and hydrocarbon compositions of oil. The most significant changes in the composition of heavy oil were established after hydrothermal treatment in the presence of a rock-forming additive, clay mineral (kaolin), which are reflected in a significant increase in the content of saturated and aromatic hydrocarbons and a decrease in the content of resins and asphaltenes. Furthermore, the changes in the structure of asphaltenes led to the increase of aromaticity and oxidation degrees. It was found that the catalyst metals mainly concentrate on the asphaltene structures and on the rock-forming reservoir minerals. It has been shown that the concentration of Fe increases up to 5.84% and that of Cu from 0 to 0.25% after catalytic treatment of oil with kaolin. A similar change was observed in the asphaltene content of rock extracts where Fe and Cu concentrations reach 1.38 and 0.31%, respectively, with no Co presence in asphaltene content. The number of catalytically active metals such as Ti, Fe, Cr, Mn, Co, Ni, Cu, Zr, and Ba was found in the rock obtained after the experiment and the extraction of organic matter. Moreover, a slight decrease from 2.27 to 1.93% in Fe concentration included in the catalytic complex has been established with an increase in Co and Cu concentrations, which were practically absent in the original rock, to 0.036 and 0.038%, respectively. It has been established as well that the studied metal complexes (Fe, Co, and Cu) with carboxylate ligands can penetrate not only into the pore space of the rock but also into asphaltenes, thereby allowing them to catalyze the process of heavy oil upgrading under hydrothermal conditions.

show abstract

Section: Resultsmentioning

confidence: 99%

Catalytic Hydrothermal Conversion of Heavy Oil in the Porous Media

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Also, carbenes and carboids are considered compaction products and oxidation products of asphaltenes [36]. In work [37], asphaltenes insoluble in toluene were named preasphaltenes.…”

Section: Methodsmentioning

confidence: 99%

Composition of Oil after Hydrothermal Treatment of Cabonate-Siliceous and Carbonate Domanic Shale Rocks

et al. 2021

View full text Add to dashboard Cite

The hydrocarbon compositions of shale oils, generated from two different lithological–facial Domanic deposits of the Tatarstan Republic (Russia), were studied under hydrothermal impact with 30% of water addition in a 350 °С and CO2 environment. The samples were extracted from carbonate–siliceous rocks of the Semiluky–Mendym deposits of the Berezovskaya area, and carbonate deposits of the Dankovo–Lebedyan horizon of the Zelenogorskaya area of the Romashkino oil field. The distinctive features of rocks are in the composition and content of organic matter (OM), its thermal stability, as well as the structural-group composition of the shale oil products. The hydrothermal treatment of the rock samples increased the content of saturates and decreased the content of aromatics, resins and asphaltenes in the composition of crude oil. The decomposition of the polymer-like kerogen structure and destruction processes of high-molecular compounds, such as resins and asphaltenes, are accompanied with the formation of substances highly rich in carbons—carbenes and carboids. The contents of n-alkanes and acyclic isoprenoids increase in the composition of saturated hydrocarbons. According to the chemical classification of Al. A. Petrov, the character of the molecular mass distribution of such substances corresponds to oil type A1, which is considered paraffinic. The contents of dibenzothiophene, naphthalene and phenanthrene are increased in the composition of aromatic hydrocarbons, while the contents of tri-methyl-alkyl-benzene and benzothiophene are decreased. The increase in the aryl isoprenoid ratio (AIR = С13–С17/С18–С22) and maturity parameter (4-MDBT/1-MDBT) under the influences of hydrothermal factors indicates the increasing thermal maturity degree of the hydrocarbon system. The differences in the distribution behavior of saturated and aromatic hydrocarbons—biomarkers in rocks of various lithological-facies types, which are reasoned by different conditions of initial organic matter transformation as well as under the impact of hydrothermal factors—were revealed.

show abstract

“…The transformation of oil residue into light hydrocarbons in the presence of steam and enough iron oxide catalysts is very attractive [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

The Composition and Structure of Ultra-Dispersed Mixed Oxide (II, III) Particles and Their Influence on In-Situ Conversion of Heavy Oil

et al. 2020

View full text Add to dashboard Cite

This paper discusses the role of magnetite in the conversion of heavy oil from the Ashal’cha reservoir. The effect of catalysts on the in-situ upgrading of heavy oil is directed on the reduction of high-molecular components of oil such as resins and asphaltenes and their molecular masses. Moreover, it is directed on the significant increase in saturates and aromatic fractions. Measuring the temperature-dependent viscosity characteristics revealed the tremendous viscosity decrease of the obtained catalytic aquathermolysis products. X-ray analysis exposed the composition of the initial catalyst that consisted of mixed iron oxides (II, III), as well as catalysts that were extracted from the treated crude oil. The particle size of the catalysts was investigated by scanning electron microscopy. According to the SEM data, aggregates of 200 nm were formed that were in the range of ultra-dispersed particles (200 to 500 nm).

show abstract

Thermal and catalytic conversion of asphaltenes

Cited by 28 publications

References 22 publications

Catalytic Hydrothermal Conversion of Heavy Oil in the Porous Media

Catalytic Hydrothermal Conversion of Heavy Oil in the Porous Media

Composition of Oil after Hydrothermal Treatment of Cabonate-Siliceous and Carbonate Domanic Shale Rocks

The Composition and Structure of Ultra-Dispersed Mixed Oxide (II, III) Particles and Their Influence on In-Situ Conversion of Heavy Oil

Contact Info

Product

Resources

About