基于原料优化与工艺调控提升石油焦品质OA

Objective This study aims to solve the problem of high sulfur content in petroleum coke produced by a delayed coking unit of a petrochemical company,which fails to meet the stringent requirements for lithium-ion battery anode materials.Method Raw material characterization,formula optimization,pilot-scale coking test,graphitization treatment,and electrochemical performance evaluation were systematically carried out.The properties and compatibility of vacuum residue,hydrodesulfurized residue,and filtered catalytic slurry oil were analyzed to determine the optimal raw material ratio,and key process parameters were then optimized in the coking pilot unit.Result High-quality petroleum coke with a sulfur content of less than 3.2%was successfully prepared.After crushing,granulation,and high-temperature graphitization,the coke was converted into an artificial graphite material.Characterization by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),and Raman spectroscopy showed that the obtained graphite material had a highly ordered crystal structure and suitable morphology.Electrochemical tests further revealed that the coin cell assembled with this material as the anode delivered an initial charge specific capacity of 363.16 mA·h/g and an initial coulombic efficiency of 94%,meeting all key performance requirements for commercial lithium-ion battery anodes.Conclusion A pilot-scale technical approach was developed for producing high-performance lithium-ion battery anode materials from low-quality heavy oil via petroleum coke upgrading,providing a phased technical pathway and data support for the high-value utilization of refinery heavy oil and the extension to downstream new material industrial chains.This approach is expected to lead to a mature industrial application after scale-up.