An Approach to Robust and Flexible Modelling and Control of pH in Reactors

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Preliminary investigations into the potential application of static feed forward neural networks in the dynamic modelling of pH in complex, time-varying systems have been carried out. To assist in network training and testing, a simplified, ‘global first principles’ (FP) model of the pH of such systems was developed, and used successfully to simulate input-output data. Neural networks with input information vectors enhanced by the introduction of auxiliary variables derived from acid-base principles were trained and tested on this data, using both Levenberg-Marquardt (L-M) and heuristic training algorithms. Both algorithms produced good predictions, but the heuristic algorithm required data pre-treatment to minimize its error. However, it trained much faster than the standard, L-M algorithm.

References (24)

  • T.K. Gustafsson et al.

    Dynamic modelling and reaction invariant control of pH

    Chem Eng Sci

    (1983)
  • B.D. Kulkarni et al.

    Nonlinear pH control

    Chem Eng Sci

    (1991)
  • F.G. Shinskey
  • V.L. Trevathan

    Characteristics of pH control, industrial process control, AIChE workshop Tampa.

    (1979)
  • N. Bhat et al.

    Use of neural nets for dynamic modelling and control of chemical process systems

    Comput Chem Eng

    (1990)
  • Kwok, D. P., Tarn, P. and Zhou, K., 1994, Control of a neutralization process using a modified elman neural net, IEEE,...
  • Domanski, P. D., Brdys, M. A. and Tatjweski, P., 1998, Design and stability of fuzzy logic multi-regional controllers,...
  • I.M. Campbell

    Acidity and Properties of Major Industrial Acids

    (1992)
  • M.F.C. Ladd et al.

    Introduction to Physical Chemistry

    (1986)
  • T.J. McAvoy et al.

    Dynamics of pH in controlled stirred tank reactor

    Ind Eng Chem Process Des Dev

    (1972)
  • T.J. McAvoy

    Dynamic modelling of pH in aqueous systems. Industrial process control, AIChE workshop Tampa

    (1979)
  • B. Westerlund et al.

    On the uniqueness in pH calculations

    Chem Eng Sci

    (1986)
  • View full text