Showing papers in "Chemical Engineering Science in 1984"

TL;DR: The cubic autocatalytic reaction (A + 2B → 3B) forms the basis for the simplest homogeneous system to display "exotic" behaviour even under well-stirred, isothermal, open conditions (CSTR).

TL;DR: In this paper, the relative importance of internal and external heat transfer and of the intrinsic (first order) pyrolysis kinetics can be determined from the Biot number (hR/K).

TL;DR: In this article, a mathematical model of the regeneration process is formulated as a system of nonlinear partial differential equations describing the conservation of mass, momentum and energy, and numerical solutions are obtained by using a combination of finite element and finite difference techniques for the spatial discretization and using an implicit ordinary differential equation solver for the resulting time integration.

TL;DR: In this article, the independent non-dimensional parameters governing the dynamics of fluidized beds are found by nondimensionalizing the differential equations governin by proper adjustment of the length scales, the particle density, and the bed superficial velocity, it is possible to obtain exact similitude between geo

TL;DR: In this article, a simple general model for the interaction between a particle and the fluid in a fluidized suspension, enables a hydrodynamic criterion for the onset of bubbling in fluidized beds to be formulated in a compact and fully predictive form.

TL;DR: In this article, an analytical study is made to calculate the axial velocity and pressure distributions in both the intake and exhaust conduits of plate heat exchangers, the flow distribution in the channels between the plates and the total pressure drop.

TL;DR: In this paper, the effects of pressure upon bed voidage at minimum fluidization and expanded bed height were analyzed for several types of particles, including coal, char and Ballotini.

TL;DR: In this article, a series of experimental viscosity data for seven different North Sea oils is presented, and a new corresponding states method for prediction of the viscosities of both gaseous and liquid hydrocarbon fluids has been developed.

TL;DR: The analysis of Cox and Brenner as mentioned in this paper for the particle motion in a nonporous duct is extended to include the effect of the wall porosity, and particle trajectories and concentrations profiles are calculated for a plane Poiseuille flow with one porous wall.

TL;DR: In this article, an ensemble of LoIs d'extrapolation is proposed for concevoir un lit fluidise dans les conditions ambiantes, which peuvent servir a caracteriser les regimes d'ecoulement and le comportement dynamique du fluide d'un lit fluidis quelconque.

TL;DR: In this paper, a systematic, efficient scheme is presented for finding parameter values corresponding to a specific number of solutions. But this scheme is not suitable for large-scale systems, where many chemical reactions occur simultaneously with a large number of parameters.

TL;DR: The main aim of the review is to introduce the biochemical principles on which the technique is based in order to lay the foundations for the adoption of the process in the near future as a new industrial unit operation.

TL;DR: A new mean has been developed as an approximation to the logarithmic mean as mentioned in this paper, which is a refinement of the arithmetic mean, which has been a useful approximation in economic analysis, and should find use both in flowsheeting programs and in rapid rating calculations.

TL;DR: Calcul de la vitesse axiale et de la distribution des pressions dans les conduites d'entree et de sortie de l'echangeur, de la transmission of l'ecoulement entre les plaques and de la perte de charge totale.

TL;DR: In this article, the Van Der Waals equation of state has been modified in order to improve its accuracy and the introduction of a temperature dependence of the attraction term allows reproducing accurately pure-compound vapour pressures.

TL;DR: In this paper, a two-resistance mass transfer model has been developed based on film resistance and homogeneous solid phase diffusion for Basic Blue 69 dye onto silica in a batch adsorption system.

TL;DR: In this paper, the expansion characteristics of non-bubbling fluidized beds of powders having mean sizes from 125 to 3 μm have been measured and the ratio of the tapped bulk density to most loosely packed bulk density gives a good indication of the cohesivity of the powder and has been used in conjunction with the Richardson-Zaki equation to correlate the data.

TL;DR: In this article, gas absorption rates in a laminar liquid jet were measured for carbon dioxide in methyl- diethanolamine (MDEA) solutions, and it was found that for the short contact times (

TL;DR: In this article, the results of investigation of hydraulics in a two-phase gas-liquid flow in vertical and horizontal rectangular channels have been presented, where flow regime maps have been worked out and a method for calculating the pressure drop in a 2-phase mixture flow has been proposed.

TL;DR: In this article, the spatial averaging theorem is used to develop transport equations for the average concentration of a solute being distributed between two phases by convection, diffusion, and interfacial transport.

TL;DR: In this article, the authors reexamine some of their previous results concerning the kinetics of reaction of CO2 with methyldiethanolamine (MDEA) and introduce an amine-catalyzed reaction with a rate constant 3.2 ( ± 1.0) M −1 s −1.

TL;DR: In this article, experimental results for the adsorption of propane and n -butane in a column packed with Linde 5A zeolite crystals, and methane, propane n -and iso-butane, and silicalite crystals were reported.

TL;DR: In this article, an atmospheric fluidized bed combustor and a cold bed constructed to operate at the same values were verified for scaling relationships for fluidized beds, and the scaling relationship was verified for both combustors and cold beds.

TL;DR: In this paper, the separation equations for the enrichment of heavy water in a batch-type thermal diffusion column have been derived for low-concentration operations, and the experimental works for various feed concentrations of H 2 OHDO-D 2 O system has been also conducted and the results quantitatively confirm with the prediction.

TL;DR: In this article, a new appraisal of free radical polymerization modeling is presented, where the authors deal with more complex cases, such as transfer to polymer, β-scission, terminal double bond propagation, etc.

TL;DR: In this article, the diffusion coefficients of helium, hydrogen, oxygen and nitrogen in water have been determined from the permeability of a stagnant liquid layer in the quasi-steady state (SLL method).

TL;DR: In this paper, the authors investigated the hydrodynamic properties of a gas-liquid-solid spouted bed with a draft tube and found that the friction factor accounting for the friction loss in the bed varies linearly on a logarithmic scale with the Reynolds number defined based on the apparent liquid circulation rate.

TL;DR: The sequential experimental design procedure for discriminating among single response rival models outlined in Chem.

TL;DR: In this article, a theory is proposed for predicting the transfer of a gas through a fluidized bed of small particles to a large particle, which enables prediction of the Sherwood number (Nsh, the dimensionless mass transfer coefficient).

TL;DR: In this paper, a study involving small scale reactor experiments coupled with detailed non-isothermal reactor modelling has been carried out and it has been shown that "isoia" is more stable than "isothermal".