Switchability issues

It should be noted that these questions do not fit comfortably within any of the conventional categories of operability analysis, such as controllability (regulatory capability about a steady state), switchability (ability to switch between operating modes), flexibility (ability to accommodate uncertainty at steady state), and robust control (ability to maintain stability and performance of a control scheme despite perturbations in the characteristics of the controlled system). Rather, we attempt to develop an integrated design approach that allows us to consider operability issues on a par with economic issues, thus permitting design and synthesis decisions to be made within a common framework. 

Assumption 6 The process flowsheet was designed to operate about a nominal operating state. When the issue of switchability (Switchability is the ability of a process to operate at different operating slates in a stable fashion.) is addressed this assumption is relaxed... 

Jessop and coworkers [46] recently developed a method of using switchable additives for hydroformylation, which allows homogeneous catalysis to take place in a monophasic solvent mixture with subsequent catalyst/product separation occurring in a biphasic solvent mixture. The method overcomes the traditional mass-transfer issues that accompany biphasic reactions, and tolerates alkenes of lower water solubility better than traditional aqueous/organic biphasic catalysis. 

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