Abstract: Based on the analysis of C₈ aromatics source, the design of C₈ aromatics isomerization unit in the aromatics complex was optimized. According to the process characteristics of aromatic complex unit, the steam balance of the whole plant was optimized by using ultra-high pressure steam and comprehensive utilization of low temperature waste heat, and the cascade utilization of steam in the whole plant was realized, which reduced the operation cost of the integrated refining and chemical processing. Based on the comprehensive analysis of C₈ aromatics resources in aromatics complex, the energy saving schemes and the evaluation of new technologies, the optimization ideas were put forward to provide the basis for further improving the economy of the unit, reducing operating cost and enhancing the competitiveness of enterprises. The application of new technologies in aromatics complex is feasible to further reduce the energy consumption of aromatics complex.

Key words: C₈ aromatics, aromatics complex unit, design optimization, refining and chemical Integration