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1 1999

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Problems and practice of pH process modelling and control in stirred tank reactors

Jutila P., Hyotyniemi H., Ylen J.

Archives of Control Sciences

1999

Vol. 9, no. 3/4

5-31

The control of pH processes in stirred tank reactors includes a wide variety of different types and levels of control tasks. The possible difficulties may arise from the quality of process or reagent liquids, the type and size of the mixing reactor, the accuracy of the instrumentation, the (perhaps time-variant) nonlinearity of the process, and last but not least the difficulties in the measurement of the pH value. In this paper these different aspects are discussed. The applications of pH control have a wide spectrum in different types of engineering problems. In this paper the environmental, chemical, and algorithmic aspects are given the main emphasis, and less attention is paid to the problems of device technology and pH measurement.