Showing papers in "Chemical Engineering Science in 1986"

TL;DR: In this paper, a new method for the correlation and prediction of salt effects on VLE is proposed, which combines a term of the Debye-Huckel type with a modified UNIQUAC equation with concentration-dependent parameters.

TL;DR: In this article, a new concept for the development of mixing rules for cubic equations of state consistent with statistical-mechanical theory of van der Waals mixing rules is introduced.

TL;DR: In this article, the results of an investigation of the behavior of one particular amine, 2-amino-2-methyl-1-propanol (AMP), as a chemical solvent for CO2 in aqueous solutions are reported.

TL;DR: Sahimi et al. as discussed by the authors investigated the dispersion in two-phase flow through disordered porous media represented by square and simple cubic networks of pores of random radii using Monte Carlo experiments.

TL;DR: In this article, a simple equation has been theoretically developed to predict the bubble detachment diameter in quiescent liquids under constant volumetric gas flow conditions, which is valid in the bubbling regime up to transition to the jetting regime and for very low up to very high viscosities.

TL;DR: In this article, a simplified filtration model was proposed to describe the flow of stable, dilute emulsions in unconsolidated porous media, where emulsion drops are captured in pores by straining and interception and, thus, reduce the overall permeability.

TL;DR: In this article, a theoretical analysis based on the assumption of steady-state quasi-equilibrium allows the size of these clusters to be estimated, typically they contain of the order of 103 molecules and are between about 4 and 10 nm in size.

TL;DR: In this article, an equation relating interfacial tension to the equilibrium compositions of the liquid phases has been developed from an interfacial layer model, which has been successfully tested for correlating data for a large number of binary systems.

TL;DR: In this paper, the use of an X-ray-heavy metal tracer method for the study of mixing patterns in opaque fluids in agitated vessels is described, and a short motion picture of the caverns and flow patterns has been made.

TL;DR: In this article, a model of breakage of drops in a stirred vessel has been proposed to account for the effect of rheology of the dispersed phase, where the deformation of the drop is represented by a Voigt element.

TL;DR: In this article, a review of PET synthesis and its kinetics has been presented, including the network of main reactions and side reactions, as well as thermodynamic and transport data pertaining to PET formation.

TL;DR: In this article, an analysis of the existing models for the description of the radiation field inside photochemical reactors for homogeneous systems is presented, where incidence and emission models are critically analysed and the contributions of the main research groups are presented.

TL;DR: In this article, the regeneration of polyacrylamide gels is effected largely by altering the ionization of carboxylic acid groups within the gel, and less influenced by ion pairing.

TL;DR: In this article, the Bethe network description of the pore space developed in Part I is used to evaluate effective diffusivities and permeabilities during char gasification and the role of pore topology on perimeter fragmentation of the gasifying particle is included.

TL;DR: In this paper, the concept of complete segregation of a binary-solid particulate fluidized bed is generalized to accommodate cases where the bottom zone contains an equilibrium mixture of the two solid components.

TL;DR: In this article, it was shown that earlier attempts to identify velocity distribution without relating it to bed structure have resulted in wrong characterization of the system and explains the difficulties arising from attempts to provide a rational basis for correlations of film heat transfer coefficients at the wall of packed tubes.

TL;DR: In this paper, the long-wave equation for film flow in vertical pipes with and without interfacial stress is studied numerically, and two sets of boundary conditions are imposed: periodic and infinite, corresponding to monochromatic and multi-frequency waves.

TL;DR: In this paper, generalized Taylor dispersion theory is extended to include position-dependent irreversible first-order reactions in the bulk fluid and on the boundaries, and the authors go beyond prior analyses in considering: (i) flows whose streamlines are curvilinear rather than rectilinear; (ii) position dependent tensorial molecular diffusivities; (iii) (conservative) external forces exerted on the reactive species; and (iv) nonuniform surface reaction velocity constants.

TL;DR: In this paper, it was shown that the rate of mass transfer of oxygen into an aqueous solution can be enhanced by the presence of small amounts (0.5-1 vol%) of a dispersed organic phase (e.g., hexadecane or cyclohexane), provided that the droplet diameter is in the order of or smaller than the film thickness.

TL;DR: In this article, a new predictive model for slug/churn transition is presented, and it is suggested that the transition takes place when the gas void fraction within the liquid slug reaches the bubble maximum volumetric packing.

TL;DR: In this article, a new theory based on deep-bed filtration concepts was proposed to describe the flow of dilute, stable emulsions in underground porous media and quantitatively test the proposed theory against experimental data.

TL;DR: In this paper, a simplified dynamic model for a PSA air separation process based on linearized mass transfer rate expressions and binary Langmuir equilibrium is developed, which provides a good representation of the experimentally observed behaviour over a wide range of conditions.

TL;DR: In this article, the adsorption and diffusion of N2 and O2 in two samples of carbon molecular sieve (Bergbau-Forschung) have been studied by gravimetric and chromatographic methods.

TL;DR: In this article, the voluem averaging method is used to derive the governing differential equations for multiphase transport, and a general closure scheme for the spatial deviations is developed for the spatially periodic boundary conditions.

TL;DR: In this paper, the relative importance of the above factors in the hydrogenation of o-nitrotoluene using palladium-on-carbon (POC) catalyst is investigated.

TL;DR: In this article, correlations based on numerous experimental data are developed for diffusional-type mass transfer, both for single drops and drop swarms, for rigid and internally circulating drops.

TL;DR: In this paper, a novel approach is presented for the physical interpretation of the slow and fast modes of process dynamics and the synthesis of multivariable and nonlinear control structures by the use of extensive thermodynamic variables.

TL;DR: In this paper, fundamental qualitative features of the dynamic response of chemical reacting systems to periodic forcing are described, including entrainment, frequency locking, bifurcations to invariant tori, and period doubling cascades.

TL;DR: In this paper, a series of model suspension experiments in a large stirred vessel (4.3 m in diameter) were studied and the tests were repeated carefully at the laboratory in a small-scale vessel under identical conditions.

TL;DR: In this article, two alternative ejection mechanisms were proposed, one from the roof of each bursting bubble, and the other from bubble wakes of the bursting bubbles, depending on bed geometry, fluidizing velocity U and particle type.