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[curious_cat]

We have a existing, under-production two-phase reaction (Liquid-Liquid; fed-batch) where I want to determine the maximum limits of performance using lab experiments had the stirring / mixing been ideal. What is the stirring rpm / tip velocity / Power input per unit volume (or any other metric) that I should choose to be reasonably assured that mass transfer limitations are overcome. 

 

The two phases have densities 0.8 and 1.1 and viscosities close to water. Intimate mixing of the two phases can be critical (or maybe not) to conversion and selectivity. I plan to choose a generously sized (i.e. oversized) Rushton Turbine shaped agitator blade to maximize the power draw. 

 

 In order to test this in a glass flask (2 Litre; baffled) I want to reach a point where the inter-phase mixing limitations are as low as can be so as to establish a limit of performance. Then, we can know how well or badly we are doing at-scale & how much scope there is for improvement. 

 

Any thoughts? Would 1500 rpm be good enough for a 2 Litre scale? 

 

Of course, I can always increase the rpm in steps till I see no difference by increasing rpm. But I am at the stage where I must buy / design the stirrer system so want to know what is a reasonable max rpm / Power input to choose. 

Edited by curious_cat, 18 July 2016 - 02:16 AM.