EPTA工艺过程的模拟与优化
发布时间：2018-10-15 07:54
【摘要】：对苯二甲酸是生产聚酯的主要原料,聚酯工业的发展也促进了对苯二甲酸工业的发展。本文以流程简单、生产高效且成本较低的EPTA工艺过程为研究对象,通过利用Aspen Plus模拟该工艺过程,对该过程进行深入了解,并为实际生产提供参考。 本文综述了对二甲苯氧化反应机理及动力学的研究进展,在Aspen Plus中使用RCSTR模块模拟氧化反应器,基于对二甲苯氧化的双曲型动力学模型以及副反应动力学模型,并利用盐沉降反应模拟固体的溶解与析出平衡,完成了氧化反应器的模拟,其模拟结果贴近实际生产结果。使用RadFrac模块模拟本质为精馏塔的脱水塔；使用RCSTR模块模拟二次氧化反应器(即一级结晶器),Crystallizer模块模拟二级、三级结晶器,其中二次反应器需考虑中间产物的二次氧化；使用Swash模块模拟过滤器,Flash2模块模拟干燥机。针对氧化单元考察了流程参数反应温度、停留时间、溶剂比以及空气流量对氧化反应的影响,并以醋酸单耗最低为目标函数优化参数。针对溶剂脱水单元,考察回流比、釜液采出率以及塔顶压力变化对脱水塔脱水效果与能耗情况的影响,并以脱水塔塔顶冷凝器与塔底再沸器总能耗最低为目标函数优化参数。最后,在各单元分段模拟的基础上,根据单元间的物流联系,完成了EPTA工艺的全流程模拟,其模拟结果与分单元模拟时结果基本保持一致,可为工厂生产提供一定的参考。在全流程的基础上提出了以一个最优温度压力下操作的结晶器替换两个绝热结晶器,并省去了过滤干燥单元,降低了结晶器堵塞的风险,大大节省了空间与装置投入成本,以补充适当热量为代价,提高了产品产量与质量。
[Abstract]:Terephthalic acid is the main raw material for polyester production, and the development of polyester industry also promotes the development of terephthalic acid industry. In this paper, the EPTA process with simple process, high efficiency and low cost is taken as the research object. By using Aspen Plus to simulate the process, the process is deeply understood, and the reference is provided for practical production. In this paper, the mechanism and kinetics of p-xylene oxidation are reviewed. The RCSTR module is used to simulate the oxidation reactor in Aspen Plus, based on hyperbolic kinetic model and side reaction kinetic model of p-xylene oxidation. The solution and precipitation equilibrium of solid was simulated by salt settling reaction, and the oxidation reactor was simulated, and the simulation results were close to the actual production results. RadFrac module is used to simulate the dehydration tower which is essentially the distillation column, and the RCSTR module is used to simulate the secondary oxidation reactor (that is, the first stage mold), Crystallizer module simulates the secondary and tertiary crystallizer, in which the secondary reactor needs to consider the secondary oxidation of the intermediate product; Swash module is used to simulate filter and Flash2 module to simulate dryer. The effects of reaction temperature, residence time, solvent ratio and air flow rate on the oxidation reaction were investigated for the oxidation unit. The minimum acetic acid consumption was taken as the objective function to optimize the parameters. For solvent dehydration unit, the effects of reflux ratio, recovery rate of kettle liquid and pressure on dehydration efficiency and energy consumption of dehydration tower were investigated. The minimum total energy consumption of top condenser and bottom reboiler of dehydration tower was taken as the objective function to optimize the parameters. Finally, on the basis of each unit subsection simulation, according to the logistics relation between units, the whole process simulation of EPTA process is completed. The simulation results are basically consistent with the results of sub-unit simulation, which can provide a certain reference for the factory production. On the basis of the whole process, it is proposed to replace two adiabatic crystallizers with a mold operated under optimal temperature and pressure, and the filter drying unit is saved, the risk of mold clogging is reduced, and the cost of space and equipment investment is greatly saved. At the cost of replenishing proper heat, the output and quality of the product are improved.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ245.12
本文编号：2271857
[Abstract]:Terephthalic acid is the main raw material for polyester production, and the development of polyester industry also promotes the development of terephthalic acid industry. In this paper, the EPTA process with simple process, high efficiency and low cost is taken as the research object. By using Aspen Plus to simulate the process, the process is deeply understood, and the reference is provided for practical production. In this paper, the mechanism and kinetics of p-xylene oxidation are reviewed. The RCSTR module is used to simulate the oxidation reactor in Aspen Plus, based on hyperbolic kinetic model and side reaction kinetic model of p-xylene oxidation. The solution and precipitation equilibrium of solid was simulated by salt settling reaction, and the oxidation reactor was simulated, and the simulation results were close to the actual production results. RadFrac module is used to simulate the dehydration tower which is essentially the distillation column, and the RCSTR module is used to simulate the secondary oxidation reactor (that is, the first stage mold), Crystallizer module simulates the secondary and tertiary crystallizer, in which the secondary reactor needs to consider the secondary oxidation of the intermediate product; Swash module is used to simulate filter and Flash2 module to simulate dryer. The effects of reaction temperature, residence time, solvent ratio and air flow rate on the oxidation reaction were investigated for the oxidation unit. The minimum acetic acid consumption was taken as the objective function to optimize the parameters. For solvent dehydration unit, the effects of reflux ratio, recovery rate of kettle liquid and pressure on dehydration efficiency and energy consumption of dehydration tower were investigated. The minimum total energy consumption of top condenser and bottom reboiler of dehydration tower was taken as the objective function to optimize the parameters. Finally, on the basis of each unit subsection simulation, according to the logistics relation between units, the whole process simulation of EPTA process is completed. The simulation results are basically consistent with the results of sub-unit simulation, which can provide a certain reference for the factory production. On the basis of the whole process, it is proposed to replace two adiabatic crystallizers with a mold operated under optimal temperature and pressure, and the filter drying unit is saved, the risk of mold clogging is reduced, and the cost of space and equipment investment is greatly saved. At the cost of replenishing proper heat, the output and quality of the product are improved.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ245.12
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