以产品收率为导向的芳烃抽提装置生产优化

Production optimization of aromatics extraction unit guided by product yield

关键词:  抽提蒸馏  芳烃抽提  流程模拟  产品收率  生产优化

Key words:  extractive distillation  aromatics extraction  process simulation  product yield  production optimization

摘要:

目的 以产品收率最大化为目标，对700 kt/a重整汽油芳烃抽提装置的主要工艺操作参数进行分析、优化，获得装置的最佳操作指标。方法 利用流程模拟软件对装置进行了系统的模拟，所建模型模拟结果与现场数据高度吻合；在确保产品质量合格且稳定的基础上，聚焦于苯、甲苯、二甲苯的最大收率，借助所建模型，对流程中的脱庚烷塔、抽提蒸馏塔、溶剂回收塔、苯塔、甲苯塔、二甲苯塔等核心设备的关键工艺操作参数进行了分析与优化，最终得出一组最优操作参数。结果 将这组最优的操作参数应用于实际生产中，最终得到的产品苯、甲苯、二甲苯的总收率分别高达99.18%、99.59%、98.16%，与优化前的总收率相比，分别提高了0.41、0.35、0.34个百分点。结论 所构建的模型完全能够满足生产优化的需求，为后续装置的进一步优化生产、技术改造，以及查找并突破装置瓶颈提供了坚实的技术支持。

Abstract:

Objective With the goal of maximizing product yield, the main process operating parameters of the 700 kt/a reforming gasoline aromatics extraction unit were analyzed and optimized to obtain the optimal operating indicators of the unit. Method The unit was systematically simulated using process simulation software, and the simulated values of the constructed model were highly consistent with the on-site values. Under the premise of qualified and stable product quality, guided by the maximum yield of benzene, toluene, and xylene, the constructed model was applied to analyze and optimize the main process operating parameters of key equipment in the process, such as the dehydrogenation tower, extraction distillation tower, solvent recovery tower, benzene tower, toluene tower, xylene tower, and a set of optimal operating parameters were obtained. Result Applying this set of optimal operating parameters to actual production, the total yields of benzene, toluene, and xylene obtained were 99.18%, 99.59%, and 98.16%, respectively, which were 0.41, 0.35, and 0.34 percentage points higher than the total yields before optimization. Conclusion The constructed model can meet the needs of production optimization and provide technical support for subsequent unit production optimization, technical transformation, and breaking through unit bottlenecks.