Showing papers in "Chemical Engineering Science in 1976"

TL;DR: In this article, the dynamic behavior of the continuous stirred tank reactor is analyzed and classified for a variable reactor residence time, and plots are given to show the influence of system parameters on the reactor behavior.

TL;DR: In this paper, a limiting case of flow in a pre-metered coating device is analyzed using a singular perturbation method, and the ability of this device to coat a range of film thicknesses at the same coating speed is traced to the freedom of the two free surfaces to adopt any curvature within certain limits.

TL;DR: In this paper, the velocity of air entrainment is found to be a function of surface tension and viscosity for viscosities less than 4.65 poise.

TL;DR: In this paper, the internal and external effective wetting of a porous catalyst in a trickle bed reactor was considered, and the internal diffusivity (Di)app was determined on the basis of a model which assumes a total external wetting.

TL;DR: In this paper, the infusion rate of tracer into a batch mixer can be characterized by a single quantity, a decay rate constant, which is then used to define a dimensionless mixing-rate number.

TL;DR: In this paper, the electrical conductivity of fluidized beds has been extended to cover the full range of conductivity ratio of the two phases, α and a wide range of dispersed phase volume fraction, f.

TL;DR: In this article, it was shown that existing data on bubble size can be described by where (U − Umf) is the excess gas flow, h is the height above the distributor and h 0, a measure of the initial bubble size, characterises the distributor.

TL;DR: In this article, a new theoretical model for calculating bubble formation at an orifice submerged in an inviscid liquid is presented, which is able to determine the instant of detachment as the moment at which the neck of the bubble closes.

TL;DR: In this article, the effect of particle removal on observed deposition rates is considered by combining previous sublayer analyses, and the functional dependence of deposition on wall shear stress for combined deposition and removal has been derived for the cases where diffusional, inertial and gravitational forces are dominant.

TL;DR: In this paper, balance scheme reduction is applied to the problem of multi-component mass balance calculations, and four categories of streams are distinguished according to the distribution of measured and unmeasured parameters.

TL;DR: In this article, the axial dispersion coefficients for helical coiled tubes were calculated for Dean numbers smaller than 16, and the ratio of the dispersion coefficient in coiled tube to that in straight tubes can with good approximation be given as a function of Dn2Sc, provided R/a > 20.

TL;DR: In this paper, the authors developed equations for air entrainment by plunging water jets with velocities in the range between 2 and 5 m/sec. Energy considerations are shown to be a good basis for predictive equations.

TL;DR: In this article, the effect of particle diameter on the rate of flotation was analyzed. But the particle charge had a drastic effect on the flotation rate, an increase by an order of magnitude being observed when the zeta potential was reduced from 60 to 30 mV.

TL;DR: This paper presents a first step to organize the evotutionary synthesis of process flowsheets by discussing the rules to make modifications and their desired properties, strategies to use these rules, and the various means to compare flowsheet.

TL;DR: In this article, it is shown that the ordered pseudo turbulence deviates so much from isotropic conditions that the usual interpretation in terms of the turbulence parameters of scale intensity is of doubtful value in this region.

TL;DR: In this article, the authors investigated the effect of the oil phase on the bubble-to-emulsion mass transfer coefficient and showed that the effect is independent of the volume fraction of n-alkans and oleic acid.

TL;DR: In this article, the authors examined X-ray cuts of particles in the range 40-260 μm when fluidized by air and observed no discontinuity in behaviour with decreasing particle size.

TL;DR: In this article, a general rate expression based on a dual-path reaction model was developed for the oxidation of coal under mild conditions such as are useful in pretreatment for gasification, and the effects on the oxidation rate of mass transfer, particle surface, oxygen partial pressure, and temperature were considered and incorporated into the derived rate expression.

TL;DR: In this paper, an analysis of hollow-fiber enzyme reactors is presented, for first-order kinetics, which leads to explicit expressions for the concentration fields on both the enzyme and substrate sides.

TL;DR: In this article, a modified Swietoslawski equation has been developed to correlate the boiling points of mixtures, which can be used to predict ternary boiling points from binary data.

TL;DR: In this article, a simple method is proposed whereby the film transfer coefficient and coefficient of diffusion in the particles may be determined from finite bath adsorption experiments, which makes it possible to separate pore and surface diffusion.

TL;DR: In this paper, the authors derived the rate and equilibrium parameters for adsorption and reaction on a single catalyst pellet to measurable properties of pulse-response experiments, and showed that the results may not be of high accuracy when many parameters are to be evaluated from one set of experimental conditions.

TL;DR: In this paper, a system model of the petrochemical industry is presented to determine the strengths and weaknesses of the industry and to perceive opportunities for further development, and a criterion of efficient feedstock utilization on the model of industry reproduces the dominant structure of the actual industry.

TL;DR: In this paper, an experimental kinetic study was made on the oxidation of bituminous coal and the results were used to test the mathematical model presented in Part I. Satisfactory agreement was observed between the data and the derived rate expressions, which included a proposed mechanism change above 230°C.

TL;DR: In this article, a modified images method is presented and used to determine the vapor density field in arrays of up to nine "quasi-stationary" evaporating particles, and the evaporation rate of each particle in an array is calculated as a function of the particle separation.

TL;DR: In this paper, the authors have developed a new system for the measurement of effective interfacial area, a, by the chemical method which allow the use of hydrocarbon solvents, such as toluene, xylene, etc; polar solvent,such as benzyl alcohol, cyclohexanol, etc.

TL;DR: In this paper, the assumption of temperature/concentration being center-symmetric in solid particles in packed beds was found to be faulty at low flow rate, and anomalously low transfer coefficients measured at low Reynolds numbers were considered to result from the erroneous assumption.

TL;DR: In this article, the transient behavior of an adiabatic fixed-bed catalytic reactor has been studied experimentally and theoretically using the hydrogenation of small amounts of CO and CO 2 to methane as the test reactions.

TL;DR: In this paper, isothermal countercurrent, cocurrent and finite bath adsorption has been modelled mathematically by using the method of orthogonal collocation, where the equilibrium between the solid and the fluid phase is assumed to be nonlinear and is described by either the Langmuir or the Freundlich type of equation.