Showing papers in "Chemical Engineering Journal in 1990"

TL;DR: In this paper, an attempt is made to review the current state of the art of mathematical models for design parameters in bioreactors from the viewpoint of isotropic turbulence theory.

TL;DR: The interaction-by-exchange-with-the-mean (IEM) and engulfment models are similar or even identic when the volume ratio of the two reagent solutions is increased, but all other important quantities (temperature, reactor, stirrer speed, stoichiometri) are not increased as mentioned in this paper.

TL;DR: In this paper, the authors compared the two most suitable processes for ethanol dehydration: azeotropic distillation with benzene as entrainer and extrophenous distillation.

TL;DR: In this paper, the effect of fine particles on gas hold-up was studied in 0.2 and 0.4 m inside diameter (i.d.) three-phase sparged reactors.

TL;DR: In this article, the kinetics of reactions of carbon dioxide with aqueous diglycolamine and morpholine solutions were studied at various temperatures and amine concentrations, using a stopped-flow technique.

TL;DR: In this article, a mass transfer model has been developed to represent the experimental data and various options for treatment of the diffusion coefficients in the model have been examined, including pre-wetting the ground corn in ethanol before oil extraction.

TL;DR: In this article, the simulation of the flow patterns generated in a disc and doughnut column was performed using a k-ϵ turbulent model and the calculated values of the mean velocities were compared with experimental results at Re = 6000, obtained by the laser doppler anemometry technique.

TL;DR: In this article, the axial dispersion coefficient of the solid phase in a fluidized bed of glass beads (0.362 mm) in the slugging and turbulent flow regimes was studied in a Plexiglas column.

TL;DR: In this article, the heat transfer coefficients between a 19 mm heat transfer probe and surrounding two-and three-phase dispersions and the air holdup were measured as functions of air velocity.

TL;DR: In this article, the individual phase holdup characteristics in three phase fluidized beds with a wide range of liquid properties have been examined, showing that the holdup increases with liquid velocity and viscosity, column diameter and liquid surface tension; it decreases with gas velocity, parti

TL;DR: In this article, the authors simulate the hydrodynamic operation of a pneumatically pulsed countercurrent liquid-liquid extraction column, where a balance on the droplet population is compiled at all levels of the column.

TL;DR: In this paper, the critical angle of bubble formation was measured for plunging liquid jets with varying density, viscosity and surface tension, and also with jets of varying diameter, flow velocity and height.

TL;DR: Three different lumped Kinetic models for methanol conversion to hydrocarbons on a ZSM-5 catalyst over the 302-370 °C temperature range were developped in this paper.

TL;DR: In this paper, a simple method requiring the average boiling point (sometimes referred to as the 50% boiling point) as the only input, was found to predict the viscositi

TL;DR: In this article, an automatic device devoted to routine working and suitable for any industrial two-phase system was developed to determine breakage abilities of droplets in a Kuhni column stage.

TL;DR: In this article, a modified Ghose kinetic growth model was used to fit the kinetic data generated here and elsewhere to a good approximation using the experimental data, including the effect of data weighting on the numerical values of the best coefficients.

TL;DR: In this article, the conductivite thermique de grains de charbon actif AC-35 was used to identify a modele a partir de mesures de la conductivité d'un lit en presence of differents gaz (temperature 30 °C).

TL;DR: A membrane microreactor was used with a Kluyveromyces marxianus strain flocculating in the presence either of calcium ions or of a flocculation additive to confirm the existence of internal diffusion limitations.

TL;DR: The mass transfer and hydrodynamic characteristics of packed bubble columns using 0.385 m i.d. column where the gas was dispersed into quiescent liquid were determined by using chemical methods.

TL;DR: In this article, the authors deal with experimental work on flow-through tightly packed beds of long cylinders and deal with axial dispersion, liquid-to-particles diffusional mass tr

TL;DR: In this article, ternary ion exchange equilibria have been predicted from measured binary equilibrium data, using the Wilson equation for solid phase activity coefficients, with a significant reduction in experimental effort.

TL;DR: In this article, holdup was predicted for a pipe inclined at +2.75° to the horizontal and compared to data on the basis of the 12 possible flow regimes present.

TL;DR: In this article, the synthesis of methyl tertiary butyl ether (MTBE) using methanol and isobutene was studied using macroporous cation exchange resin, Amberlyst 15 in the hydrogen form, as a catalyst in the temperature range 328-348 K.

TL;DR: In this paper, the authors used IR spectroscopy and a variable pressure cell (up to 30 bar) to investigate the solubility of various solutes in liquid nitrogen, liquid oxygen and liquid argon.

TL;DR: A parametric theoretical study for a solar-powered steam jet refrigeration (SJR) system was performed in this paper, in order to evaluate to what extent the SJR system par

TL;DR: In this paper, an oxygen microsensor was used to determine the thickness of the boundary layer outside a spherical biocatalyst particle in liquid flow, and the results were compared with correlations available in the literature using the superficial liquid velocity.

TL;DR: In this paper, a multivariable control strategy for wastewater sludge stabilization by anaerobic digestion has been developed by developing a multivariability control strategy, which is solved by digital simulation.

TL;DR: In this article, the laminar flow characteristics of oil-in-water emulsions with oil concentrations greater than 59% by volume have been investigated experimentally and the flow curve, i.e., shear stress vs. shear rate plot on a log-log scale, clearly exhibited the presence of a yield-stress.

TL;DR: In this paper, an investigation was made into the reaction kinetics and methods of particle size control in the hydrolytic polycondensation of tetraethyl orthosilicate (TEOS) to form spherical silica particles in ethanol with ammonia as catalyst.

TL;DR: In this article, a theoretical model for a packed bed biological loop reactor is presented by considering both external and internal resistances for the general case of Monod kinetics, and numerical solutions have been obtained by the method of orthogonal collocation for a wide range of saturation parameters to cover the two limiting cases of zero-order and first-order kinetics.