Showing papers in "Chemical Engineering Journal in 1979"

TL;DR: In this article, a special measuring system has been developed with which investigation of undisturbed suspension pipe flow is possible, even close to the wall, based on laser-Doppler anemometry.

TL;DR: In this paper, the hydrodynamic behavior of a column filled with dumped PALL rings has been investigated, while some results have been obtained with RASCHIG rings and cylindrical screens as packing The solid used was a microspherical catalyst carrier.

TL;DR: In this paper, an interpretation of the influence of the gas velocity on pulsing inception is also hazarded; correlations based on the energy dissipation in the column are proposed, when added to those of the literature, cover quite a wide range of operating conditions, packing shapes and tower sizes.

TL;DR: In this article, the authors evaluated axial dispersion of gas and solid phases in a gas-solid packed column at trickle flow using residence time distribution (RTD) experiments.

TL;DR: In this article, the effect of interfacial viscosities on the creeping motion of a bubble or drop in another fluid medium containing trace amounts of impurities such as surfactants was analyzed.

TL;DR: In this paper, axially dispersed plug-flow model was used to determine axial dispersion coefficients in the liquid phase of gas-liquid (three-phase) fluidized beds.

TL;DR: A novel method for determining gas recirculation rates through impeller cavities in sparged agitated vessels is described, based on the withdrawal, particularly from the cavities themselves, of gas samples for subsequent analysis.

TL;DR: In this paper, the height of an overall transfer unit in a gas-solid packed column at trickle flow has been evaluated by measuring column performance during steady state adsorption experiments using Bodenstein numbers for the gas and solid phases from a previous investigation.

TL;DR: In this article, a three-environment model was developed to characterise the effects of mixing on the performance of a chemical reactor which is fed separately by feedstreams each of which may have arbitrary flowrate and residence time distribution.

TL;DR: In this article, a straight vertical Perspex tube of diameter 25 mm and length about 2 m with a water-air system at room temperature was measured at gas velocities below 50 m/s and liquid flow rates up to 265 cm 3 /s.

TL;DR: In this paper, the Beer-Lambert law is reformulated allowing unambiguous determination of the radiation field inside the reactor, including the limiting cases of diffuse and unidirectional radiation.

TL;DR: In this paper, a simple mathematical model has been developed for catalyst fouling in an adiabatic packed-bed reactor, where the main reaction was taken to be of Langmuir-Hinshelwood form, while first-order kinetics with respect to both the fouling precursor and the concentration of active sites were used for the rate.

TL;DR: In this paper, the authors measured the power dissipation in a vibrating disc column of 17.2 cm inside diameter in a liquid single phase system and in a gas-liquid two-phase system.

TL;DR: In this paper, the absorption of lean SO2 in aqueous solutions of Na2CO3 was carried out using a stirred vessel with a plain gas-liquid interface and the rates of absorption of SO2 and desorption of CO2 accompanying the chemical absorption were measured.

TL;DR: In this paper, the radial and axial dispersion coefficients of cocurrent, liquid-supported, gas-fluidized beds were evaluated from radial concentration profiles downstream of a point-source, steady state tracer injector.

TL;DR: In this article, the energy balance of a single non-adiabatic continuous stirred tank (CSTR) and a cascade of n CS was analyzed for a single CSTR and n CS.

TL;DR: In this paper, the authors examined the effect of distributor design on the total heat transfer coefficient between a 12.7 mm diameter electrically heated copper tube and a square fluidized bed (0.305 m × 0.305m) of glass beads.

TL;DR: In this article, Hougen, Watson and Ragatz (HWR) and the other by Dotterweich and Mooney (DM) were used to compute motive steam consumptions in a single-stage, single-fluid, steam jet ejector as a function of nozzle and diffuser efficiencies.

TL;DR: The diffusivities of carbon dioxide in aqueous solutions of mixed electrolytes were measured at 25 °C and 1 atm by means of a diaphragm cell techniqu

TL;DR: In this article, the fractional gas hold-up, effective interfacial area a and the liquid side mass transfer coefficient k L a were obtained from 100 and 200 mm i.d. packed bubble columns using wire gauze packings.

TL;DR: In this paper, the performance of a trickle bed is analyzed in terms of a mixing-cell concept in which the three-phase reactor is visualized as a number of mixing cells in series.

TL;DR: In this paper, a classification of the entire kinetic parameter space on the basis of maximum yield of the desired product versus recycle ratio behavior is presented, where region wherein a CSTR, a PFR or a PFO with recycle are optimal can be readily indentified.

TL;DR: In this paper, the mass transfer coefficients and drop size distributions produced in liquid-liquid cocurrent flow through fluidized beds of solid particles were determined, consistent with the results of an analysis of droplet collision with an element of the fluidized bed.

TL;DR: In this article, Taitel and Tamir presented a fully predictive model for the condensation of multicomponent mixtures and verified the predictions of the theoretical model were successfully verified by condensing several binary mixtures (acetone-methanol, acetone-ethylanol, methanol-ethanol) onto a cooled vertical wall.

TL;DR: In this paper, the method of inequalities is used to design feedback controllers for an open loop unstable model of the non-isothermal continuous stirred tank reactor, which is used in this paper.

TL;DR: In this paper, the effectiveness of an encapsulated enzyme particle was investigated by considering complete internal and external mass of the enzyme particle by considering both the particle and the mass of its external mass.

TL;DR: In this paper, the authors proposed an analytical method for estimating mass transport rates in a magnetoelectrolytic cell in moderate magnetic fields, and experimental data were presented to show that the method is of reasonable accuracy.