Abstract: Petroleum coke is solid product obtained through delayed coking, primarily using heavy components of crude oil (such as vacuum residuum, deasphalted asphalt, etc.) as raw materials, and is widely used in the field of electrode materials and fuel. With stricter carbon emission limitations and environmental protection regulations, the demand for low-vanadium, low-sulfur petroleum coke is becoming more urgent. Low-sulfur coke requires sulfur content not exceeding 3%, and petroleum coke with even lower sulfur content has higher value. Electrode coke used in the metallurgical industry also has high restrictions on metal vanadium content; petroleum coke with vanadium content not exceeding 300 μg/g can be used to produce high-grade electrodes and is more valuable. Sulfur and metals in crude oil were mainly concentrated in the heavy components, so during the coking process, most sulfur and almost all metals existed in the petroleum coke, which is unfavorable for the production of low-sulfur, low-metal petroleum coke. A new combined technology including diluent viscosity reduction-hydrogenation pretreatment-delayed coking was developed, enhancing the mass transfer of reactions in the fixed-bed hydrogenation unit. Dedicated RRC series catalysts were designed for poor-quality coking feedstock hydrogenation, to achieve controllable pretreatment, and efficient removal of sulfur and metallic heteroatoms. This has led to the development of RIGHT technology for producing low-vanadium, low-sulfur petroleum coke, meeting the conditions for industrial application.

Key words: delayed coking feedstock, low-sulfur and low-vanadium petroleum coke, hydrogenation delayed coking, RIGHT technology