考虑水力学可行性的反应精馏塔板持液量设计及优化

doi:10.12034/j.issn.1009-606X.217414

过程工程学报 ›› 2018, Vol. 18 ›› Issue (6): 1239-1244.DOI: 10.12034/j.issn.1009-606X.217414

考虑水力学可行性的反应精馏塔板持液量设计及优化

林子昕¹，安然¹，安维中^1*，黄连喜¹，别海燕¹，朱建民²

1. 中国海洋大学化学化工学院，山东青岛 266071 2. 辽宁奥克化学集团，辽宁辽阳 111003

收稿日期:2017-12-07 修回日期:2018-03-23 出版日期:2018-12-22 发布日期:2018-12-19
通讯作者: 安维中 awzhong@ouc.edu.cn
基金资助:
内部热集成反应精馏系统的综合及节能研究

Design and optimization of liquid holdup on reactive distillation tray considering hydraulic feasibility

Zixin LIN¹, Ran AN¹, Weizhong AN^1*, Lianxi HUANG¹, Haiyan BIE¹, Jianmin ZHU²

1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, Shandong 266071, China 2. Liaoning Oxiranchem Group, Liaoyang, Liaoning 111003, China

Received:2017-12-07 Revised:2018-03-23 Online:2018-12-22 Published:2018-12-19
Contact: an weizhong awzhong@ouc.edu.cn

摘要/Abstract

摘要： 以筛板塔为塔板基础构型，以原料转化率最大为目标，以塔径和出口堰高为主要调节参数，以塔板水力学可行性为约束条件，建立了一种可优化塔板液相持液量的塔板结构设计方法. 塔模拟计算在Aspen Plus平台上进行，化学反应采用动力学方程表达，塔板水力学计算采用Cup-Tower软件. 结果表明，本设计方法应用于DPC反应精馏过程，在满足流体力学可行性条件下，塔板上液相持液量比基础设计提高了1.39倍，苯酚转化率提高了33.6%.

关键词: 反应精馏, 持液量, 碳酸二苯酯, 水力学核算

Abstract: The liquid holdup is limited by the physical space of the column and should not be appointed at random. To obtain the design and optimization of liquid holdup on reactive distillation trays, an optimization of tray configuration framework considering hydrodynamic feasibility was proposed. The effect of the liquid holdup on the reaction was studied, and the most optimal liquid holdup was obtained, through simultaneous design of three aspects of the liquid holdup, tray configuration and the hydrodynamic feasibility. Using the synthesis of diphenyl carbonate (DPC) by the transesterification of dimethyl carbonate (DMC) with phenol (PhOH) as an example, the implemented process of this method was described in detail. In the process of implementation, sieve tray was employed as illustrated configuration according to the traditional design method of distillation tray, with the maximum reactants conversion as objective function, weir height and column diameter of tray as decision variable and hydrodynamic feasibility of tray as constraints, a step-by-step simulation and design method was developed to achieve the optimization of liquid holdup on reactive distillation trays. Aspen Plus and Cup-Tower software were used to conduct the process simulation with chemical reaction kinetics and hydraulic computation respectively. The results showed that, the weeping was the main limiting factor to increase the liquid holdup. In the column with a diameter of 0.7 m and 0.06 m weir height, the maximum liquid holdup of 18.5 L was obtained, compared to the basic design an increase of holdup of tray by 1.39 times and PhOH conversion by 33.6% under the condition of satisfying hydraulic feasibility could be obtained. The temperature of the reboiler did not exceed 195℃ with optimizing the liquid holdup. In addition, the reaction rate of PhOH was higher than that of the initial design, which showed the validity of the proposed method for the DPC reactive distillation process.

Key words: reactive distillation, holdup, diphenyl carbonate, hydraulics calculation

林子昕安然安维中黄连喜别海燕朱建民. 考虑水力学可行性的反应精馏塔板持液量设计及优化[J]. 过程工程学报, 2018, 18(6): 1239-1244.

Zixin LIN Ran AN Weizhong AN Lianxi HUANG Haiyan BIE Jianmin ZHU. Design and optimization of liquid holdup on reactive distillation tray considering hydraulic feasibility[J]. Chin. J. Process Eng., 2018, 18(6): 1239-1244.

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考虑水力学可行性的反应精馏塔板持液量设计及优化

Design and optimization of liquid holdup on reactive distillation tray considering hydraulic feasibility

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