A comparison of the specific productivity which can be achieved with our three reactor types is illustrated in Fig 11 . As can be observed, the specific productivity obtained in the pRS-SDR is approximately 2.6 times higher than the microflow reactor. This was obtained with a 50 ml•min -1 liquid flowrate (1 mol% RB, 0.1 M substrate, 3:1 gas-to-liquid ratio) for full conversion in the pRS-SDR and with a residence time of 60 s for full conversion in the microflow reactor (1 mol% RB, 0.1 M substrate, 3:1 gas-to-liquid ratio). Therefore, to obtain the same total productivity as obtained with the pRS-SDR, the microflow reactor would have to be scaled up 71 times. This would be challenging due to reasons previously mentioned. On the other hand, the pRS-SDR works without any significant pressure drops across the reactor and the dispersed type flow, essential for effective mass transfer, was consistently observed at high rotation speeds for the high throughputs used.