Low aromatic solvent oil production technology is another core technology of our company. Our company took the lead in using highly efficient and highly dispersed nano metal intercalation catalyst to reduce the hydrogenation pressure to medium and low pressure level, and took the lead in reducing domestic solvent oil aromatics to less than 50ppm. The technology has been successfully applied in solvent oil, rolling oil and transformer oil. The unit shown in the figure is a 300000 t / a environmentally friendly solvent oil and rolling oil production unit in Nanjing refinery. The unit has been running smoothly for more than ten years, and all indexes have met the design requirements.