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精对苯二甲酸是聚酯工业的原料,其生产对化工工业的发展至关重要。故本文从精对苯二甲酸装置加氢反应过程的机理出发,采用ASPEN DYNAMICS过程模拟软件建立了加氢反应过程的动态模型;并根据实际工况数据,对加氢反应动力学参数进行了校正。据此,本文仔细考察了加氢反应器参数对反应的影响,得出温度、压力、对羧基苯甲醛、对羟甲基苯甲酸、对甲基苯甲酸浓度等随反应器床层高变化分布曲线。当反应器的床层高不断变大,加氢反应不断进行时,温度、压力、反应物及反应产物的变化曲线和实际较为吻合。另外,基于动态模型,分析了生产负荷变得情况下反应过程的动态响应,讨论了对羧基苯甲醛、对羟甲基苯甲酸、对甲基苯甲酸浓度等反应产物的动态响应特性。反应物中除对羧基苯甲醛呈拟二阶响应外,其余都表现为一阶响应。本文又引入了工业装置加氢反应器压力控制方案,并对其进行了控制性能的仿真分析,结果表明:加氢反应器控制方案在变负荷情况下,可以通过调整反应器压力保持对苯二甲酸中对羧基苯甲醛浓度的稳定。
Polyester terephthalate is the raw material for the polyester industry, whose production is crucial to the development of the chemical industry. Therefore, starting from the mechanism of the hydrogenation reaction of the terephthalic acid plant, the dynamic model of the hydrogenation reaction was established by ASPEN DYNAMICS process simulation software. The kinetic parameters of the hydrogenation reaction were corrected according to the actual working conditions . Therefore, this paper carefully examines the hydrogenation reactor parameters on the reaction, obtained temperature, pressure, p-carboxybenzaldehyde, p-hydroxybenzoic acid, p-methylbenzoic acid concentration with the reactor bed distribution of high variation curve. When the bed height of the reactor is getting larger and the hydrogenation reaction proceeds continuously, the curves of the temperature, the pressure, the reactants and the reaction products are in good agreement with the actual ones. In addition, based on the dynamic model, the dynamic response of the reaction process under the condition of production load is analyzed. The dynamic response characteristics of the reaction products such as p-carboxybenzaldehyde, p-hydroxybenzoic acid and p-methylbenzoic acid are discussed. In addition to the reaction of carboxybenzaldehyde pseudo-second-order response, the rest of the performance of the first-order response. In this paper, the pressure control scheme of hydrogenation reactor for industrial plant was introduced and its control performance simulation was analyzed. The results show that under the condition of variable load, the control scheme of hydrogenation reactor can keep the pressure of benzene Carboxylic acid in the concentration of carboxybenzaldehyde stability.