Experimental measurements of volumetric mass transfer coefficient by the dynamic pressure-step method in internal loop airlift reactors of different scale

Model‐Aided Design of a Three‐Phase Gas‐Lift Reactor for Oxidation Accompanied by Catalyst Reversible Deactivation

“…Analogously with the findings of Juraščík et al [18], the GLR model simulations proved negligible difference in the reactor performance if the number of downcomer tanks varied from 7 to 18. To save the computation time, the number of downcomer tanks was set to 7 in this work.…”

“…The correlation in Eq. (14) of Juraščík et al [5] serves this purpose as, in the full recirculation regime of their ILGLR, the mass transfer coefficient value is likely to be unaffected by different mixing and gas composition in the riser and downcomer of the GLR. The authors used the dynamic pressure-step method for the k L a measurement in the ILGLR.…”

“…The GLR model adjustable input parameters are: degree of Glc conversion, all the feed (and start-up) concentrations, the catalyst concentration, kinetic parameters [1], temperature (fixed at 30°C), atmospheric pressure (fixed), superficial gas velocity, number of tanks, and basic geometrical parameters. The basic geometrical parameters (the reactor type -internal loop GLR, the GLR volume, its separator volume, its bottom height, the liquid height, the outer column diameter, and the riser wall thickness) were adopted from the experimental GLR of volume 40 L (see [4][5][6][7][8]12]). This particular re- actor has been a source of many hydrodynamic correlations employed in the GLR model (see section 2.2).…”

“…For any input operational conditions, maximal productivity of the reactor is only guaranteed in the point of the target GLR optimal geometry. The GLR model proposed employs a tanks-in-series mix-ing model to combine the hydrodynamics of a real GLR [4][5][6][7][8][9][10][11][12] and the kinetics of glucose oxidation by air over the palladium catalyst [1]. This GLR model is much simpler and a bit more realistic than that of Kluymans et al [2], who employed an axial dispersion mixing model with hydrodynamics measured in a small-scale 2D bubble column reactor and considered intraparticle diffusion.…”

Optimal Design of a Multifunctional Reactor for Catalytic Oxidation of Glucose with Fast Catalyst Deactivation

“…The GLR model input adjustable parameters are: degree of Glc conversion, all the feed (and start-up) concentrations, the catalyst concentration, kinetics parameters, temperature (fixed, 30°C), atmospheric pressure (fixed), superficial gas velocity, number of tanks and basic geometrical parameters. The basic geometrical parameters (the reactor type -internal-loop gas-lift reactor (ILGLR), the GLR volume, its separator volume, its bottom height, the liquid height, the outer column diameter and the riser wall thickness) were adopted from experimental GLR, volume 40L (see , , Juraščík, et al (2006), Sikula, et al (2007), , Sikula & Markoš (2008) ). This particular reactor has been a source of many hydrodynamic correlations employed in the GLR model.…”