Liquid–Liquid Mass Transfer Enhancement in Milliscale Packed Beds

Abstract

The mass transfer of cyclohexanone oxime (CHO) from n-octane (continuous phase) to H 2 SO 4 (dispersed phase) was enhanced in milliscale packed beds under large phase ratios. The holdups of two phases were determined, and the effects of structure and operating parameters on the overall mass transfer coefficient of the organic phase (K 0 a) were also investigated, including placement mode, surface property, size of particle and bed, flow rate and phase ratio, and CHO concentration. Different flow regimes were found in different placement modes and surface properties. Compared with tubes, packed beds showed 1 order of magnitude increase of K 0 a. A prediction model for K 0 a was proposed and showed good agreement with the experimental results. Pressure drop and energy dissipation were further measured to access the mixing efficiency. These results are therefore expected to contribute to the novel process of the caprolactam industry and expand the applications of microflow technology.

Micromixing Intensification within a Combination of T-Type Micromixer and Micropacked Bed

“…Herein, we tried to establish a predictive dimensionless correlation with a wide range of applications. Considering the existing microreactor mixing performance prediction correlations in the literature [ 14 , 24 , 46 , 51 ] and the above-mentioned micromixing experimental results, we proposed the following equation for correlation. where the effects of fluid properties, micropacked bed characteristics, and each microstructure on the micromixing process were reflected by the ratio of the initial Reynolds number of the two fluids ( ), the Reynolds number in the connecting pipe after the micromixer ( ), the Reynolds number in the micropacked bed ( ), and the time for the fluid to enter the micropacked bed from the T-type micromixer ( ).…”

“…Herein, we tried to establish a predictive dimensionless correlation with a wide range of applications. Considering the existing microreactor mixing performance prediction correlations in the literature [14,24,46,51] and the above-mentioned micromixing experimental results, we proposed the following equation for correlation.…”

“…The liquid–liquid micromixing is challenged by the incremental differences between the mixing fluids in terms of viscosity, density, and wettability [ 1 , 14 , 46 ]. In particular, the low diffusion coefficient in high-viscosity fluids resulted in slow molecular motion [ 14 ], and increasing the viscosity also decreased the Reynold number and inhibited the generation of convection individually.…”

Continuous flow synthesis of β-hydroxyethyl hydrazine in microreactors: process behavior and impurity formation mechanism

“…To enhance fluid mixing in a low Reynolds number situation (approximately 100-200), the microreactor was packed with stainless steel triangular screw packing. 25,26 The effects of various operational parameters, including the molar ratio of…”

I&EC Research Special Issue on Fluidic Devices without Moving Parts

“…Some applications not envisaged at the time of the call are also seen (for example, a cook stove as a fluidic device without any moving parts). The contributions in this special issue may be broadly classified into four groups: Microfluidics/microreactors − Coils, curved channels, and inserts − Specialized fluidic devices − Other − …”