Strategy analysis and practice for maximizing the production of mixed xylene in continuous reforming unit.

This article introduces the actual production situation of a 1.2 MM TPY continuous reforming unit in a certain company, explores the reasons that affect the output of mixed xylene products, and proposes optimization measures. Taking the yield of mixed xylene as the optimization objective, relevant optimization strategies are explored in three stages: feedstock optimization, reaction process and product distillation. The optimization measures are as follows: (1)In terms of feedstock optimization, the aromatics potential content of naphtha resources is ranked, and the aromatics potential content in the reforming feed is controlled at around 45 % ; According to the load capacity of the unit and the situation of feedstocks, the initial boiling point of the reforming feed is increased from 67 °C to 74 °C, and the mass fraction of C₈ component in the reaction feed is increased by 1. 8 percentage points, and the production of mixed xylene is increased by about 2 t/h; (2)In terms of the reaction process, the reaction temperature is reduced from 524 °C to 518 °C, which improves the conversion rate of aromatics; Control the chlorine mass fraction between 0. 5 and 0. 7 µg/g ensures the acidic function of the catalyst; (3)In terms of product distillation, with the target product quality as the goal, optimize the temperature of the sensitive plate in the distillation section, optimize the separation strategy for mixed xylene, avoid xylene resources flowing into gasoline, and control the para xylene content in C₉⁺ naphtha to a minimum. Adjustment result: The abnormal decrease in the content of mixed xylene products is avoided, while maximizing production of mixed xylene. [ABSTRACT FROM AUTHOR]