Influence of Parameters of Delayed Coking Process and Subsequent Calculation on the Properties and Morphology of Petroleum Needle Coke from Decant Oil Mixture of West Siberian Oil

This paper includes the results of studies of the temperature effect in the range of 480–510 °C at an excess pressure of 0.35 MPa, as well as the effect of excess pressure from 0.15 to 0.55 MPa at a temperature of 500–510 °C, during the delayed coking of a decant oil obtained from a mixture of West Siberian oils and subsequent calcination in an inert atmosphere of nitrogen at 1100 °C on the microstructure and properties of the needle coke. Properties such as absolute density, volatile-matter yield, ash, sulfur, and trace element contents were analyzed to evaluate the quality of the “green” and calcined coke. The microstructure of the obtained coke was analyzed by means of X-ray diffraction, for which the evaluation criteria were the interplanar spaces d 002 and d 100, as well as the crystallite sizes L c and L a. The scanning electron microscopy method was used to confirm the results of the formed structure of petroleum coke analysis obtained earlier. The calcined samples were assigned to needle cokes with stringy-circular flow domain anisotropy.