Showing papers in "Chemical Engineering Journal in 1992"

TL;DR: In this paper, a semi-empirical model for estimating the solubility of N2O in amine mixtures is presented, which is based on the work by Prausnitz and Chueh.

TL;DR: In this article, a correlation has been proposed for estimating saturated liquid viscosity based on its relationship with vapour pressure, and the viscosities at the normal b are estimated.

TL;DR: In this paper, the effect of alcohol, organic acid and potassium chloride concentration on bubble size, bubble stability, terminal bubble rise velocity and gas hold-up in bubble columns was investigated.

TL;DR: A group contribution method for the prediction of the molar volume at the normal boiling point has been developed in this paper, which can be used for both organic and inorganic compounds.

TL;DR: In this paper, the effect of sonication on the performance of a Michael reaction in toluene under solid-liquid phase transfer conditions has been investigated, and the results showed that the initial reaction rate is increased by a factor of 10 under sonication.

TL;DR: In this article, an experimental study of residence time distribution (RTD) by pulse response analysis in a continuous Couette flow device with rotating inner cylinder and stationary outer cylinder was performed under conditions of negligible and significant influence of molecular diffusion and Taylor vortex flow.

TL;DR: In this paper, a fractional equation for describing transport in fractal and disordered structures is proposed, which is consistent with known results for diffusion on fractals and should also apply to systems showing more general anomalous transport behaviour.

TL;DR: In this article, a model based on dimensional analysis is proposed for cross-flow microfiltration processes, which gives the permeate flux f in terms of the pressure drop across the filtration membrane ΔP and the velocity V of the feed fluid in the membrane tubes.

TL;DR: In this article, a new model was developed for the gas hold-up in bubble column reactors based on two different expressions for the energy dissipation rate used to derive the correlations for the heat transfer rate.

TL;DR: In this paper, a detailed mechanistic model for a batch solution polymerization of methyl methacrylate is presented and compared for their suitability for process optimization and control applications.

TL;DR: In this paper, an apparatus was designed to measure the evaporation rates of the components comprising a binary liquid mixture, from a horizontal surface, under condi Evaporation studies were conducted on the ethanol-water system.

TL;DR: In this article, experimental air holdup data for air-water and airwater-glass bead systems are reported as a function of superficial air velocity, dispersion temperature and slurry concentration of glass bead powders of different average diameters.

TL;DR: In this paper, a new method for calculating the critical constants using the Rackett equation is proposed, which requires the introduction of an exponential term function of the reduced temperature, which is more accurate than the original Rackett value of 2 7 in the case of high molecular weight compounds, and a trial-and-error calculation according to which all critical constants can be derived from two experimental data of density and a known Z RA value.

TL;DR: In this article, a unified similarity transformation has been proposed which can deduce a class of possible similarity solutions during forced-, free- and mixed-convection flow of non-newtonian inelastic fluids through porous media under Darcy and non-Darcy conditions.

TL;DR: In this article, a simulated moving column continuous countercurrent chromatographic reactor-separator (SCCR-S) system was used for combined bioreaction and separation of dextran from sucrose.

TL;DR: In this paper, a fixed-bed test reactor suitable for studying non-isothermal reaction kinetics was developed, which allows axial and radial temperature measurem The water-gas shift reaction over a commercial iron-based catalyst was chosen as the subject of a case study.

TL;DR: In this article, a high performance compact reactor (HCR) is visualized as a continuous flow stirred tank reactor with sludge recycle; a simple mathematical model based on Monod kinetics and Michaelis-Menten kinetics for substrate utilization has been used to evaluate the biokinetic coefficients.

TL;DR: In this article, a kinetic model for the simulation of the formation of aldehydes has been proposed, where the nucleus which gave an aldehyde was assumed to consist of components with different susceptibilities to degradation, although the degradation of each component was taken to obey first-order kinetics.

TL;DR: In this paper, a coherent model was developed to predict the pressure drop in homogeneous (bubbly flow) and heterogeneous (churn-turbulent) regimes.

TL;DR: The importance of growth and separation of the gas boundary layer in the diffuser section of venturi scrubbers has been examined in this article, where experiments in three small venturis which differed only in their diffuser angle were used.

TL;DR: In this paper, the effect of surface tension reduction on observed flow pattern, holdup and pressure drop was investigated for cocurrent air and air-surfactant solution two-phase flow in a pipe 0.0935 m in inside diameter.

TL;DR: In this paper, the catalysts of two nickel catalysts and of a commercial platinum catalyst were compared for benzene formation by dehydrogenation of cyclohexane and cyclomethane, and it was shown that the orientation of adsorbed benzene depends on the dispersion of metal in the nickel catalyst and also on the temperature.

TL;DR: In this paper, a more general model for microbial growth under any form of dual limitation is presented, which allows a variable extent of interaction between the two limiting factors, and also allows the presence of a variable number of interacting factors.

TL;DR: In this article, a new model has been developed for the liquid phase flow pattern in bubble columns, which satisfies the mass, momentum and energy balances for the gas and liquid phases.

TL;DR: In this article, the local non-linear equilibrium approach is used to compare three blowdown policies, and it is shown that the intermediate policy (partial recovery of the blowdown gas) is optimal.

TL;DR: In this article, power consumption and mixing times for helical ribbon agitators of different pitch and ribbon width under laminar flow conditions in newtonian liquid were measured.

TL;DR: In this paper, the assumption of constant axial dispersion coefficient in residence time distribution (RTD) experiments is examined for liquid fluidized beds and a quantitative criterion is proposed for the constraint required to achieve the true value of the axial density in RTD experiments.

TL;DR: In this paper, a simple rational description of trickle flow is given, which may be extended to a radial dispersion study, and analytical relations between liquid flow-rate distributions, and the irrigated fraction of the bed and the operating conditions are derived by maximizing the informational entropy of the system.

TL;DR: A typical biological process is compared with its counterpart chemical process and the role of the chemical engineer in designing and developing such a process is examined through a series of examples.

TL;DR: In this article, it was found that bubble size distribution is dependent on aeration time, and the distribution curves do not change after an “establishment time, the small bubble holdup and the total gas hold-up reach their final values, while the contribution of small bubbles to the gas volume in the dispersion reaches about 60%.