Analysis and Modeling of Industrial Purified Terephthalic Acid Oxidation Process

Abstract A mathematic model to predict the concentration of 4-carboxy-benzaldhyde (4-CBA) for an industrial Purified Terephthalic Acid (PTA) oxidation unit is built in this paper. The model is based on a mechanism model from the results of bench-scale laboratory experiment and chemical reaction principle, which is structured into two series ideal CSTR models. Six plant factors are designed to correct the deviation between the laboratory model and the industrial practice. For the existing of substantial time delays between process variables and quality variable, the weighted moving average method is applied to make each variable be in same time slice. The analysis of process data by projection on latent variables of Partial Least Square (PLS) and analysis of Hotel ling's T-squared statistic value of Principal Component Analysis (PCA) are gave to discriminate the operating data into normal operating part and load down and load up operating part. At the each operating part, the typical data are selected to regress the plant factors. The proposed model predictive result follows the tracks of the observed value quite well. Compared with the empirical Amoco model, the proposed model is regarded as to be more suitable to be applied to industrial online soft sensor.

[1]  Cheng-Ching Yu,et al.  Coordinated control of blending systems , 1998, IEEE Trans. Control. Syst. Technol..

[2]  Alberto Bemporad,et al.  Control of systems integrating logic, dynamics, and constraints , 1999, Autom..

[3]  Haitao Huang,et al.  Comparison of PI and MPC for control of a gas recovery unit , 2002 .

[4]  J. B. Riggs Improve distillation column control , 1998 .

[5]  Cheng-Ching Yu,et al.  Optimal region for design and control of ternary systems , 2003 .

[7]  Moses O. Tadé,et al.  ETBE Synthesis via Reactive Distillation : 2. Dynamic Simulation and Control Aspects , 1997 .

[8]  V. Agreda,et al.  High-purity methyl acetate via reactive distillation , 1990 .

[9]  William L. Luyben,et al.  Practical Distillation Control , 1992 .

[10]  Cheng-Ching Yu,et al.  The relative gain for non-square multivariable systems , 1990 .

[11]  J. M. Douglas,et al.  Simple, analytical criteria for the sequencing of distillation columns , 1985 .

[12]  Arturo Jiménez,et al.  Analysis of control properties of conventional and nonconventional distillation sequences , 2001 .

[13]  Muhammad A. Al-Arfaj,et al.  Comparison of Alternative Control Structures for an Ideal Two-Product Reactive Distillation Column , 2000 .

[14]  Yi-Chuan Chen and,et al.  Design and Control of Heat-Integrated Reactors , 2003 .

[15]  William F. Clocksin,et al.  Programming in Prolog , 1987, Springer Berlin Heidelberg.

[16]  Theodora Kourti,et al.  Statistical Process Control of Multivariate Processes , 1994 .

[17]  William L. Luyben,et al.  Capacity-Based Economic Approach for the Quantitative Assessment of Process Controllability during the Conceptual Design Stage , 1995 .

[18]  Michael F. Malone,et al.  Conceptual design of distillation systems , 2001 .

[19]  P. Daoutidis,et al.  Dynamics and control of an ethyl acetate reactive distillation column , 2001 .

[20]  Theodora Kourti,et al.  Analysis, monitoring and fault diagnosis of batch processes using multiblock and multiway PLS , 1995 .

[21]  Cheng-Ching Yu,et al.  Design alternatives for the amyl acetate process: Coupled reactor/column and reactive distillation , 2002 .

[22]  Chung-Sung Tan,et al.  Liquid-Phase Esterification of Propionic Acid with n-Butanol , 2001 .

[23]  Abdul Rahman Mohamed,et al.  Neural networks for the identification and control of blast furnace hot metal quality , 2000 .

[24]  W. Luyben,et al.  Evaluation of plant-wide control structures by steady-state disturbance sensitivity analysis , 1995 .

[25]  Design and Control of a Gas-Phase Adiabatic Tubular Reactor Process with Liquid Recycle , 2001 .

[26]  W. Luyben Snowball effects in reactor/separator processes with recycle , 1994 .

[27]  Hua Wei Key problems and research program for PTA process domestic development , 2001 .

[28]  Kwo-Liang Wu,et al.  Reactor/separator processes with recycle—1. Candidate control structure for operability , 1996 .

[29]  Muhammad A. Al-Arfaj,et al.  Control of ethylene glycol reactive distillation column , 2002 .

[30]  William L. Luyben,et al.  Analysis of Control Structures for Reaction/Separation/Recycle Processes with Second-Order Reactions , 1996 .

[31]  Christodoulos A. Floudas,et al.  Nonlinear and Mixed-Integer Optimization , 1995 .

[32]  Zeynep H. Gümüş,et al.  Reactive distillation column design with vapor/liquid/liquid equilibria , 1997 .

[33]  D. Semino,et al.  Control configuration selection in recycle systems by steady state analysis , 1997 .

[34]  W. Luyben,et al.  Extensions of the simultaneous design of gas-phase adiabatic tubular reactor systems with gas recycle , 2001 .

[35]  W. K. Chan,et al.  Reactive distillation using ASPEN PLUS , 1990 .

[36]  Sigurd Skogestad,et al.  Reactor/separator processes with recycles-2. Design for composition control , 2003, Comput. Chem. Eng..

[37]  S. Steinigeweg,et al.  Reactive Distillation , 2000 .

[38]  William L. Luyben,et al.  Design and control of an olefin metathesis reactive distillation column , 2002 .

[39]  Christos Georgakis,et al.  On the use of extensive variables in process dynamics and control , 1986 .