EFFECT OF METAL OXIDE COAL ADDITIVES ON CRACKING OF EXTRA-VISCOUS OIL IN SUBCRITICAL AQUEOUS FLUID
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Kazan National Research Technological University
2.
Kazanskiy nacional'nyy issledovatel'skiy tehnologicheskiy universitet
3.
KNITU; KNRTU
4.
Ufimskiy Gosudarstvennyy Neftyanoy Tehnicheskiy Universitet
5.
KNITU
Type:
Article
Pages:
from 35
to 40
Status:
Published
Received:
23.12.2025
Accepted:
25.12.2025
Published:
25.12.2025
Language:
Russian
Keywords:
EXTRA-VISCOUS OIL, LOW-TEMPERATURE CRACKING, COAL ADDITIVE, ASPHALTENES, SARA ANALYSIS, DEGREE OF TRANSFORMATION, METAL OXIDE CATALYSTS
Abstract (English):
Recently, there has been a tendency to increase the share of extra-viscous oils in the total volume of produced hydrocarbons. Insufficient knowledge of the reactivity of the components of ultra-viscous oils in aqueous fluids at high temperatures and pressures is the main constraint in the creation of new environmentally friendly technologies, as well as in improving the efficiency of existing processes of their processing. The article examines the effect of a coal metal oxide additive on the low-temperature cracking of heavy oil in a subcritical aqueous fluid. The study was conducted at a temperature of 356 °C and a pressure of 17 MPa. The results of the effect of a coal additive on the cracking process of extra-viscous oil are described, which consists in reducing the yield of liquid hydrocarbons due to the formation of a large amount of gases. The article examines the effect of modification of coal additives by a mixture of NiO/al₂o₃ and NiO/fe₃o₄ oxides on the conversion of asphaltenes and resins during low-temperature cracking of ultra-viscous oil. It is shown that modification of the coal additive by metal oxides contributes to a significant increase in the degree of conversion of asphalt-resinous components and provides a high yield of saturated (more than 37% by weight) and aromatic compounds (more than 40% by weight). The presence of a mixture of NiO and Fe₂o₃ oxides in the composition of the coal additive contributes to the greatest conversion of asphaltenes (97%) and resins (92%), a decrease in the formation of gases and coking substances, and an increase in the yield of liquid products with a high content of aromatic hydrocarbons. The presence of elements such as sulfur, iron, nickel and vanadium in the composition of the spent activated carbon additive was also noted, which indicates the effective processes of desulfurization and demetallization.
Recently, there has been a tendency to increase the share of extra-viscous oils in the total volume of produced hydrocarbons. Insufficient knowledge of the reactivity of the components of ultra-viscous oils in aqueous fluids at high temperatures and pressures is the main constraint in the creation of new environmentally friendly technologies, as well as in improving the efficiency of existing processes of their processing. The article examines the effect of a coal metal oxide additive on the low-temperature cracking of heavy oil in a subcritical aqueous fluid. The study was conducted at a temperature of 356 °C and a pressure of 17 MPa. The results of the effect of a coal additive on the cracking process of extra-viscous oil are described, which consists in reducing the yield of liquid hydrocarbons due to the formation of a large amount of gases. The article examines the effect of modification of coal additives by a mixture of NiO/al₂o₃ and NiO/fe₃o₄ oxides on the conversion of asphaltenes and resins during low-temperature cracking of ultra-viscous oil. It is shown that modification of the coal additive by metal oxides contributes to a significant increase in the degree of conversion of asphalt-resinous components and provides a high yield of saturated (more than 37% by weight) and aromatic compounds (more than 40% by weight). The presence of a mixture of NiO and Fe₂o₃ oxides in the composition of the coal additive contributes to the greatest conversion of asphaltenes (97%) and resins (92%), a decrease in the formation of gases and coking substances, and an increase in the yield of liquid products with a high content of aromatic hydrocarbons. The presence of elements such as sulfur, iron, nickel and vanadium in the composition of the spent activated carbon additive was also noted, which indicates the effective processes of desulfurization and demetallization.
Keywords:
EXTRA-VISCOUS OIL, LOW-TEMPERATURE CRACKING, COAL ADDITIVE, ASPHALTENES, SARA ANALYSIS, DEGREE OF TRANSFORMATION, METAL OXIDE CATALYSTS
EXTRA-VISCOUS OIL, LOW-TEMPERATURE CRACKING, COAL ADDITIVE, ASPHALTENES, SARA ANALYSIS, DEGREE OF TRANSFORMATION, METAL OXIDE CATALYSTS
