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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received March 4, 2014
Accepted July 22, 2014

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Dynamic modeling and control of industrial crude terephthalic acid hydropurification process

Zhi Li Weimin Zhong^† Yang Liu Na Luo Feng Qian^†

Key Laboratory of Advanced Control and Optimization for Chemical Processes, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

wmzhong@ecust.edu.cn

Korean Journal of Chemical Engineering, April 2015, 32(4), 597-608(12), 10.1007/s11814-014-0207-z

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Abstract

Purified terephthalic acid (PTA) is critical to the development of the polyester industry. PTA production consists of p-xylene oxidation reaction and crude terephthalic acid (CTA) hydropurification. The hydropurification process is necessary to eliminate 4-carboxybenzaldehyde (4-CBA), which is a harmful byproduct of the oxidation reaction_x000D_ process. Based on the dynamic model of the hydropurification process, two control systems are studied using Aspen Dynamics. The first system is the ratio control system, in which the mass flows of CTA and deionized water are controlled. The second system is the multivariable predictive control-proportional-integral-derivative cascade control strategy, in which the concentrations of 4-CBA and carbon monoxide are chosen as control variables and the reaction_x000D_ temperature and hydrogen flow are selected as manipulated variables. A detailed dynamic behavior is investigated through simulation. Results show that the developed control strategies exhibit good control performances, thereby providing theoretical guidance for advanced control of industry-scale PTA production.

Keywords

Terephthalic Acid Hydropurification Reaction Dynamic Modeling Multivariable Predictive Control DMC Plus

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