Showing papers in "Chemical Engineering Journal in 1985"

TL;DR: In this paper, a fixed bed adsorption theory is introduced to analyze the performance of large-scale affinity separations in a rotating annular chromatograph and a batch operation of the adorption and wash steps.

TL;DR: A pulse technique for evaluating rate coefficients and equilibrium constants and for characterizing non-specific adsorption on affinity packings is described and is also a convenient method for screening affinity carriers and for optimizing Adsorption, wash and elution conditions.

TL;DR: In this paper, the effective radial thermal conductivity and apparent wall heat transfer coefficient in a packed bed were determined experimentally in a laboratory-scale packed bed heat exchanger, where care was taken to use a thermo-couple support cross made out of low conductivity materials and to measure the wall temperature profile.

TL;DR: In this paper, a numerical procedure based on the method of characteristics is presented for the simulation of the average overall heat transfer behavior of a heat exchanger which is subjected to chemical reaction fouling.

TL;DR: In this paper, the influence of small amounts of natural gas, C2H6 and CO on the homogeneous gas phase reduction of NOx by NH3 was investigated in air-rich flue gas from an oil-fired boiler (1 MJ s−1) at temperatures from 1100 K to 1350 K.

TL;DR: In this article, an empirical procedure to change the Co ion catalyst concn. was used to establish a procedure for the measurement of O2 transfer coeff. (KLa).

TL;DR: In this paper, the feasibility of Penicillin G recovery by reactive extraction at room temperature in a Karr column was demonstrated, where the pH values were kept between 5 and 6, as opposed to losses larger than 10% in the industrial process using a centrifugal extractor at pH values 2 − 2.5 and 5 °C with short contact times.

TL;DR: In this paper, the reaction rate of carbon dioxide with ethylenediamine in non-aqueous solvents such as methanol, ethanol and ethyleneglycol was investigated using a stirred tank absorber with a plane gas interface at 303 K. The reaction rate could be expressed as first order with respect to carbon dioxide for every solvent.

TL;DR: In this article, the application of a conical fluidized bed as a remedial measure for certain inherent drawbacks of gas-solid systems is suggested, and investigations were carried out in Perspex cones with apex angles of 10°, 30°, 45° and 60°, with spherical glass beads of different sizes as the bed material, and air as the fluidizing medium.

TL;DR: In this paper, a 100 cm × 5.7 cm internal diameter tower fermentor was fabricated and operated continuously for 11 months using the flocforming yeast, Saccharomyces cerevisiae (American Type Culture Collection 4097), and steady state operation was characterized at 32 °C and pH 4.0 for glucose concentrations ranging from 105 to 215 g l−1.

TL;DR: In this paper, sound spectra of gas dispersion phenomena were obtained using a hydrophone and a spectrum analyzer at three locations (the sparge ring, the impeller and a position in the bulk of the tank) in an agitated tank as a function of gassing rate and impeller rotational speed.

TL;DR: In this article, a biofilm model has been developed in order to comprehend the biological processes in a packed bed reactor and the effects of diffusional resistance inside the biofilm and the backmixing of the bulk liquid have been incorporated to obtain general analytical solutions for zero-order and first-order kinetics.

TL;DR: In this paper, a new method to find the shape factor and density of porous and non-porous particles is proposed, based on pressure-drop data and the Blake-Kozeny equation.

TL;DR: Fuzzy modelling is applied to a biocatalytic conversion process, sucrose inversion by immobilized whole cell yeast invertase, and the development of a simple expert system is demonstrated.

TL;DR: In this article, a modele mathematique de denitrification par Thiobacillus denitrificans sur filtres garnis par du soufre and du carbonate de calcium (maerl) is presented.

TL;DR: In this article, an electrochemical technique was used to measure the wall mass transfer coefficient in a trickle bed reactor in the pulsed-flow regime, and the results were compared with heat transfer measurements carried out in previous work and satisfactory agreement is observed.

TL;DR: In this paper, an experimental analysis of the relationship between the taille of cristaux and their humidite interne is presented, and it is shown that l'humidity interne tends to increase with the vitesse de refroidissement.

TL;DR: Wilson and NRTL correlations are used to derive equations for predicting the composition and temperature of multicomponent azeotropes from binary equilibrium data as mentioned in this paper, which lead to an efficient and reliable algorithm for their solution.

TL;DR: In this article, non-linear analyses of a bubble column reactor are carried out to elucidate its oscillatory behavior, and the pertinent integrodifferential equations are reduced to a set of finite dimensional ordinary differential equations by spectral expansion with an orthogonal set of polynomial basis functions.

TL;DR: In this paper, the stability of non-isothermal flow through porous media is investigated experimentally when both density and viscosity are functions of temperature and the instability phenomena are due to the buoyancy effect of an upward-directed density gradient and fingering effect of the displacement of a more viscous fluid by a less viscous one.

TL;DR: In this paper, the synthese de l'acetate de menthyle par transesterification is mise en oeuvre dans une colonne de resine echangeuse de cations sous forme H + dans laquelle on injecte transitoirement des quantites limitees de menthol dans l'sacetate d'ethyle (solvant reactif), on montre qu'il est alors possible d'obtenir the conversion totale du menthol, malgre un equilibre thermodynamique

TL;DR: In this article, the effects of mass and momentum transfer parameters such as fluid flow velocities, drop characteristics, film resistance layers, and the residence time of an accelerating isothermal stream of drops on the absorption and oxidation rates of sulfur dioxide were investigated.

TL;DR: In this article, the reaction time and catalyst initial activity that maximize the apparent production rate of isothermal fixed-bed reactors operated in reaction-regeneration cycles have been computed and compared with those from experiments on reaction and regeneration carried out for a system where kinetic equations for the main reaction, deactivation and regeneration, and the activity-coke relationship are known.

TL;DR: In this article, the mass transfer and hydrodynamic characteristics of 0.038 m stainless steel Pall rings and 0.05 m polypropylene Pall rings were determined in a column with 0.385 m internal diameter and the values of effective interfacial area and liquid-side mass transfer coefficient were obtained by chemical methods.

TL;DR: The methode du gradient reduit as discussed by the authors is a technique used by the ordinateur de procedes chimiques to traiter le classique d'optimisation du volume reactionnel d'une cascade de reacteurs.

TL;DR: In this article, a modelisation of the operation d'echange dions is proposed, in which equations de transfert de matiere en phase liquide and solide sont resolus numeriquement for the couche fixe and la couche fluidisee of un ou plusieurs etages.

TL;DR: Poly(ethylene glycol) can be considered as effectively replacing centrifugal acceleration in achieving a given level of enzyme recovery, and a possible quantitative explanation using an elementary particle statistics approach is proposed.

TL;DR: In this paper, an equation for the dependence of mixing time on mixer rotational velocity has been proposed, which has the very simple form tN 1.76 = const and it is independent of the method of the mixing time measurement.

TL;DR: In this paper, a modified packet model for mass transfer between an immersed surface and a gas-fluidized bed of particles with non-zero mass capacity is presented, which explains the effect of solid mass capacity C ms particle size d s and packet residence time τ - p, on the surface-to-packet mass transfer coefficient.