A variable transformation approach to in-line pH control

NORTCLIFFE, Anne and LOVE, J (1998). A variable transformation approach to in-line pH control. In: Control '98. UKACC International Conference on (Conf. Publ. No. 455). IET, 931-934.

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Current practice and research into pH control principally entails the use of continuous stirred tank reactors (CSTR). Whilst the over-design of this process does indeed damp out disturbances, it is expensive and leads to problems with control. Industry requires systems that are: economical, both in terms of capital and operating costs; robust from a control point of view; operable and flexible from a process point of view. pH control of neutralisation is a difficult nonlinear control problem. This is largely due to the gross nonlinear behaviour of pH measurement, but also due to the variable time delays inherent in the process. Nonlinear processes have traditionally been controlled by a combination of linear control methods and gain scheduling. However in the last few years much progress has been made in the development of nonlinear control systems. This paper outlines a variable transformation approach, that is an anti-logging technique which removes the nonlinearity at source and yields an hydrogen ion concentration which is easier to handle.

Item Type: Book Section
Uncontrolled Keywords: hydrogen ion concentration, variable transformation approach, in-line pH control, CSTR, continuous stirred tank reactors, robustness, neutralisation, nonlinear control problem, variable time delays, anti-logging technique
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Engineering Research
Departments - Does NOT include content added after October 2018: Faculty of Science, Technology and Arts > Department of Engineering and Mathematics
Page Range: 931-934
Depositing User: Anne Nortcliffe
Date Deposited: 19 Jan 2018 15:47
Last Modified: 18 Mar 2021 16:23
URI: https://shura.shu.ac.uk/id/eprint/14469

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