Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 32, Issue 4, Pages 597-608Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-014-0207-z
Keywords
Terephthalic Acid; Hydropurification Reaction; Dynamic Modeling; Multivariable Predictive Control; DMC Plus
Funding
- Major State Basic Research Development Program of China [2012CB720500]
- National Natural Science Foundation of China [U1162202, 61174118]
- Fundamental Research Funds for the Central Universities
- Shanghai R&D Platform Construction Program [13DZ2295300]
- Shanghai Leading Academic Discipline Project [B504]
- State Scholarship Fund of China [CSC:201206745009]
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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 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 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.
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