Abstract The relation between modelling and design of control systems for chemical reactors is discussed, using several practical examples. Criteria for controlability and satisfactory response are proposed. The dependence of the controller structure on the properties of the reactor model is investigated, and it is shown that the most important decisions in controller design occur during process design. The information required for controller design is different from the information required for scaleup, and depends on the design approach. Examples chosen are control of a fluid catalytic cracker, a hydrocracker, and a crystallizer. Control and reactor modelling are not only often separate activities by themselves, but they are done in separate groups and current practice is to call the control engineering in after the design is finished or the plant either operates or is scheduled to start operation. If we want to make significant advances, we have to realize that some of the most important decisions that...
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