Hydrogenation and extraction combined processing method of diesel oil

The invention discloses a hydrogenation and extraction combined processing method taking diesel raw oil as a raw material, which adopts high-temperature and low-pressure hydrofining to reduce sulfur and nitrogen impurities and simultaneously saturate only few aromatic hydrocarbons, so that the content of paraffin in raffinate oil can be increased, and the hydrogen consumption can be reduced. Compared with the method for producing the low-carbon olefin raw material through direct extraction of straight-run diesel oil, the method has the advantages that the raffinate oil yield is higher, meanwhile, the influence of sulfur and nitrogen impurities on the extraction solvent is reduced, and the energy consumption, material consumption and solvent loss generated by solvent purification are reduced; compared with the traditional hydrogenation technology, the method for producing the low-carbon olefin raw material has the advantages that the raffinate oil has higher alkane content and is more suitable for being used a