Effect of high-viscosity oils composition on coking process

Deposits of high-viscosity oils and natural bitumens are regarded as future sources of hydrocarbons. Bear in mind that oil is not just the energy feedstock. This is, above all, a raw material for a number of valuable chemicals of various purposes. Selection of respective refining process of highly viscous oils is an urgent task that requires complete information about their physico-chemical properties, composition and quality of petrochemicals produced from them. Therefore, a comprehensive study of the properties and component, hydrocarbon and fractional composition of oil is a major priority
Materials and methods
Materials — oil samples from Vereiskian and Bashkirian deposits of the Akanskoe field. Methods — determination of physico-chemical properties according to GOST; determination of component composition by standart technique; determination of hydrocarbon composition by gas-liquid chromatography; atmospheric and vacuum distillation; periodic coking.
Results
The comprehensive study of crude oils for Bashkirian and Vereiskian carbonate reservoirs of the Akanskoe field in the Republic of Tatarstan has carried out. Physical and chemical characteristics of oils are defined, as well as fractional and component compositions. It is shown that the oils from carbonate reservoirs of the Akanskoe field are heavy, highly viscous, high-sulphur, their composition is enriched with heavy resin-asphaltene components and depleted in light fractions. The content of oil fractions is insignificant. These oils are characterized by high coking. There is a sufficiently high (48–50%) yield of coke in the periodic coking process, which confirms the prospect of heavy residues of oil to produce marketable coke.
Сonclusions
The fuel and coke direction can be recommended as the most rational refining direction for crude oils of the Akanskoe field. As low sulfur raw materials are used for the further oil processing, but investigated oils are high-sulphur, its heavy oil residues require additional refining processes.