Liquid–liquid flow and mass transfer characteristics in micro-sieve array device with dual-sized pores

Liquid–Liquid Microdispersion Method for the Synthesis of TS-1 Free of Extra-Framework Ti Species

“…The main contraction is that the mass transfer rate of Ti species is still far below the requirements in the batch stirring process. However, the problem that the mass transfer rate is far less than the hydrolysis rate for Ti sources may be solved by liquid–liquid microdispersion technology using a microreactor for its superior mixing abilities. − The micromixer is a good passive mixing device where the dispersed droplet size can be less than or equal to the size of microchannels on the order of micrometers. − So a larger specific surface area and a shorter diffusion distance can be provided where a smaller disperse drop size appears, the mass transfer coefficient K c a could raise to 0.020–2.1 s –1 in a microsieve pore reactor compared to the mass transfer coefficient K c a of 10 –4 –10 –3 s –1 in conventional liquid–liquid batches based on our groups’ previous work. , In recent years, some fast chemical reactions where the key control step is mass transfer for reactants or intermediates have been enhanced by the microreactor system, such as synthesis of CaHPO 4 particles, synthesis of polyvinyl butyral, Beckmann rearrangement of cyclohexanone oxime, and so on. By the way, the microreactor system could be operated in a continuous way, , so the controllable precursor may be synthesized continuously.…”

“…23−25 So a larger specific surface area and a shorter diffusion distance can be provided where a smaller disperse drop size appears, the mass transfer coefficient K c a could raise to 0.020−2.1 s −1 in a microsieve pore reactor compared to the mass transfer coefficient K c a of 10 −4 −10 −3 s −1 in conventional liquid−liquid batches based on our groups' previous work. 26,27 In recent years, some fast chemical reactions where the key control step is mass transfer for reactants or intermediates have been enhanced by the microreactor system, 28 such as synthesis of CaHPO 4 particles, 29 synthesis of polyvinyl butyral, 30 Beckmann rearrangement of cyclohexanone oxime, 31 and so on. By the way, the microreactor system could be operated in a continuous way, 32,33 so the controllable precursor may be synthesized continuously.…”

Bubble generation rules in microfluidic devices with microsieve array as dispersion medium

“…It was found that the Ca number of continuous phase and channel size mainly influence the droplet size. The mass transfer of liquid-liquid system in such devices was studied by Shao et al 20 However, we still need more studies on bubble generation rules in microsieve dispersion devices for gas-liquid system.…”