Abstract:

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 ℃ to 74 ℃, 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 ℃ to 518 ℃, 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 C⁺₉ naphtha to a minimum. Adjustment result: The abnormal decrease in the content of mixed xylene products is avoided, while maximizing production of mixed xylene.

Key words: CCR, mixed xylene, product property constraints, maximize, reaction conditions, sensitive plate temperature

摘要：

介绍了某公司1.2 Mt/a连续重整装置的实际生产情况，探讨了影响混合二甲苯产品产量的原因，并提出对应优化措施。以混合二甲苯产量为优化目标时，分别在原料优化、反应过程和产品精馏3个环节探讨相关优化策略。优化措施：原料优化方面，按石脑油资源芳烃潜含量排序，将重整进料芳烃潜含量控制在45%左右；根据装置负荷能力和原料情况，重整进料初馏点从67℃提至74℃,反应进料中C₈组分油的质量分数提高了1.8百分点，混合二甲苯产量提高约2 t/h;反应过程方面，反应温度从524℃降至518℃,提高了芳烃的转化率；氯质量分数控制在0.5～0.7μg/g,确保催化剂酸性功能；产品精馏方面，以目标产品质量为目标，优化精馏部分灵敏板温度，优化混合二甲苯分离策略，避免二甲苯资源流入汽油，将C⁺₉石脑油中对二甲苯含量控制至最低。调整结果：避免了混合二甲苯产品含量异常降低，同时混合二甲苯实现产量最大化。

关键词: 连续重整, 混合二甲苯, 产品性质约束, 最大化, 反应条件, 灵敏板温度