Estimation of mass transfer parameters in a Taylor-Couette-Poiseuille heterogeneous reactor

Abstract

-A bench-scale, continuous vortex flow reactor (VFR), with a radius ratio, , equal to 0.48 and an aspect ratio, , equal to 11.19 was studied. This reactor may be used in the enzymatic hydrolysis of polypeptides obtained from sweet cheese whey with enzymes immobilized on agarose gel. Operational conditions were 2410 < Re < 11793 and 30-min residence time for glycerol-water, 14% w/w, 27 o C (Re ax = 1.1) and for water, 38 o C (Re ax = 1.5). Residence time distributions (RTDs) were obtained after pulse injections of different tracers (including dyed solid particles). Mass transfer coefficients of a lumpedparameter model of the reactor were estimated from these data. Model fitting to experimental data was accurate. Working conditions were selected so that transport properties of the fluids would be similar to the ones in the actual process at the final stages of whey hydrolysis.

Anodized titania nanotube array microfluidic device for photocatalytic application: Experiment and simulation

“…This can be assumed equivalent to increasing the rate constant. To examine this modeling analog, we have conducted simulations of fractional conversion at different flow rates while varying the diffusion coefficient (D = 1.6 × 10 −10 m 2 /s for methylene blue [34,49]) and pseudo-first order rate constant (k = 0.2238 min −1 ), respectively (Fig. 10).…”

Taylor‐Couette reactor: Principles, design, and applications

“…The performance of the reactor was close to that of a plug flow reactor for low rotational speeds, although at higher ω the by-pass flow and the mixing between vortices decreased the performance and were worse than a stirred tank 42 . Subsequently, the authors applied immobilized enzymes in the protein cleavage of cheese whey in a continuously operated TCR to obtain a uniform molecular weight distribution without damaging the fragile catalyst beads 117 . Another example is the utilization of immobilized Penicillin G acylase is immobilized in bi-dispersed gel matrix particles for the synthesis of β-lactam antibiotics like ampicillin for which, again, the low strain on solid enzyme supports is also required.…”

“…This is also evident in the correlations for Pe presented below. Giordano et al investigated water and water glycerol mixtures in a TCR (Λ = 0.48, Γ = 11.19) with low axial velocity Re ax = 1–1.5 for 2,410 < Ta < 11,793 76 . For this range, Pe was described by Equation ().…”

Improving the Yields and Reaction Rate in the Ethanolysis of Soybean Oil by Using Mixtures of Lipase CLEAs

“…This kind of reactor is a good option when the catalysts are fragile but need to be homogenously suspended and mixed in the reaction medium, due to their gentle but efficient stirring system [53,54,55,56]. The reaction medium is confined in the gap between two concentric cylinders, the inner rotating and the outer generally stationary [54,57]. The agitation promoted by the inner cylinder is less aggressive than that one obtained with conventional stirrers [55,56].…”