Abstract: As an important raw material for the production of aromatics and light olefins, the comprehensive utilization of naphtha is the most important task in the optimization of integrated refining and chemical scheme. By analyzing the influence of naphtha group composition and the change of light and heavy naphtha composition on the production of aromatics and olefin, the processing scheme of naphtha was optimized, and some suggestions were put forward to improve the comprehensive utilization level of naphtha resources. When iso-alkanes was separated from naphtha, especially from light naphtha, it was more favorable to increase the yield of ethylene and total olefin for ethylene plant using the naphtha rich in normal alkanes as raw material. The separation accuracy of naphtha fractions was controlled by key components instead of traditional distillation range control, and the fractions composed of different groups were sent to different production units for further processing. The utilization scheme of light naphtha was further optimized through the application of normal/iso-alkanes separation technology of light naphtha. By adjusting the feed composition of the reforming unit, the aromatics yield was increased. The above measures are more effective in optimizing the integrated refining-chemical scheme and improving the comprehensive utilization of naphtha resources.

Key words: naphtha, refining and chemical Integration, reforming unit, distillation, adjustment of components