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Application of new chemical test reactions to study mass transfer from shrinking droplets and micromixing in the rotor-stator mixer

Bałdyga J., Kotowicz M.

Chemical and Process Engineering

2017

Vol. 38, nr 3

477--489

A pair of fast competitive reactions, neutralization and 2,2-dimetoxypropane (DMP) hydrolysis, has been applied do study mass transfer and micromixing in a T 50 Ultra-Turrax® - IKA rotor-stator device. In experiments the dispersed organic phase containing p-Toluenesulfonic acid (pTsOH) dissolved in diisopropyl ether, whereas the continuous phase was represented by the aqueous solution of sodium hydroxide, 2,2-dimetoxypropane (DMP) and ethanol. During mixing a fast mass transfer of a solute (pTsOH) from organic phase droplets, which were shrinking due to fast dissolution of the organic solvent, was followed by micromixing and chemical reactions in the continuous phase. Measured hydrolysis yields were applied to express effects of mixing on the course of chemical reactions. Modeling was based on application of models describing drop breakup, mass transfer in the liquid-liquid system and micromixing. Combined effects of mass transfer and drop breakage on drop population were expressed using the population balance equations. The model has been used to interpret experimental results, in particular to identify the efficiency of mixing.

Application of test reactions to study micromixing and mass transfer in chemical apparatus

Bałdyga J., Jasińska M., Trendowska J., Tadeusiak W., Cooke M., Kowalski A.

Czasopismo Techniczne. Mechanika

2012

R. 109, z. 1-M

11--20

Chemical parallel test reactions are used to investigated micromixing efficiency in homogeneous systems and effects of mass transfer on selectivity of complex reactions in two-phase liquid-liquid systems. Mixing phenomena in stirred tanks, rotor-stator mixers and microreactors are investigated.

Równoległe, testowe reakcje chemiczne zastosowano do badań efektywności mikromieszania w układach jednofazowych oraz badań wpływu transportu masy na selektywność przebiegu reakcji złożonych w układach dwufazowych ciecz-ciecz. Badania prowadzono w reaktorach zbiornikowych, mieszalnikach typu rotor- stator i mikroreaktorach.