Abstract: Based on a comparison with traditional regeneration processes (acid washing and clay refining), the core advantages of the two-stage hydrogenation technology in terms of reaction mechanism, process flow, and equipment design are elaborated in detail. Using operational data from industrial-scale plants, the application efficiency of this technology is comprehensively evaluated, including the quality indicators of regenerated base oil, performance comparison with commercially available API Group II base oil, and the energy and material consumption of plant operation. Additionally, a comprehensive assessment and quantitative study are conducted on its environmental benefits, covering resource recovery rate, reduction of waste gas, wastewater, and solid waste (three wastes), as well as carbon footprint. Finally, targeted technology promotion strategies are proposed, such as the collaborative development model, policy utilization, and standardization recommendations.The results show that the two-stage hydrogenation technology has significant technical and economic benefits as well as excellent environmental benefits in the field of waste mineral oil regeneration, with a regeneration oil yield of up to 92% and a CO₂ emission reduction of 1.5 t/t.

Key words: waste mineral oil, two-stage hydrogenation technology, commercial application, environmental benefit, technology promotion