CHARACTERISTICS OF THE DEGRADATION PRODUCTS OF RESINS AND ASPHALTENES IN SUPERCRITICAL WATER
Abstract
The use of supercritical water is a promising way to transform heavy oil feedstock into light products. Heavy hydrocarbon raw materials are characterized by a high content of high-molecular components, which make processing difficult. The upgrading of asphaltenes and heavy oil residue resins in supercritical water was studied using an autoclave reactor. The experiments were carried out at a temperature of 450 °С, the duration was 60 min, and the pressure was 4.7 MPa. The reactivity and structural changes of resins and asphaltenes were evaluated from the yield of products (gas, oils, resins, asphaltenes, and solid products) and the characteristics of the initial and thermally treated high molecular weight compounds (resins, asphaltenes) using a structural group analysis. For maximum conversion, a catalyst precursor, iron(III) tris-acetylacetonate, was used, which forms catalytically active iron oxides upon thermolysis. The positive effect of supercritical water on the conversion of resins and asphaltenes has been shown. The use of supercritical water makes it possible to reduce the yield of solid products and increase the yield of light products. In the presence of a catalyst, asphaltenes turned out to be more reactive than resins. Thermolysis using supercritical water leads to changes in the parameters of the macrostructure of residual resins and asphaltenes. During the thermolysis of resins in the presence of water, the number of structural blocks in the molecule in the secondary resins decreases, and the number of heteroatoms increases compared to the initial resins. The use of iron oxides contributes to a significant increase in the H/C ratio in secondary asphaltenes obtained by thermolysis of asphaltenes. The number of structural blocks decreased by 2 times.
For citation:
Nalgieva Kh.V., Kopytov M.A. Characteristics of the degradation products of resins and asphaltenes in supercritical water. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2023. V. 66. N 11. P. 25-31. DOI: 10.6060/ivkkt.20236611.11t.
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