ISSN:0001-1541    

DOI:10.1002/aic.690270102

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractExperimental binary and ternary equilibrium data for the adsorption of hydrocarbon mixtures of methane, ethane, ethylene, and propylene on activated carbon at 20°C are presented and discussed. Reproduction of binary adsorption equilibria and prediction of ternary adsorption equilibria exclusively with data of binary systems have been carried out using a real adsorbed solution theory, which requires the calculation of the activity coefficients for the components in the adsorbed phase.Predicted equilibrium data are found to be in excellent agreement with experimental values using Wilson and UNIQUAC equations to calculate the activity coefficients. The real absorbed solution theory provides a much more accurate method for predicting multicomponent adsorption equilibria than the ideal adsorbed solution theory

ISSN:0001-1541    

DOI:10.1002/aic.690270103

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractA suboptimal control algorithm is derived for a continuous latex reactor subject to deterministic and stochastic disturbances to control the pathological behavior of the reactor. An extended Kalman filter based on an instantaneous local linearization technique is used to estimate the reactor states, and a quadratic performance index is used to derive the suboptimal feedback control law. This study successfully demonstrates the application of the multivariable control theory to the control of a simulated continuous latex reactor operating under limit‐cycle conditions. The mathematical model used for the control studies was previously developed and has been shown to describe the performance of an actual reactor system extremely well over its entire range of operatio

ISSN:0001-1541    

DOI:10.1002/aic.690270104

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractThe trend observed on variation of the operating conditions during CO oxidation on platinum in a CSTR is as follows: stable states → simple oscillations → multipeak oscillations → stable states. Analysis of the experimental results indicates that a third or higher order system of differential equations is necessary to describe most of the observa

ISSN:0001-1541    

DOI:10.1002/aic.690270105

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractA branched pore kinetic model for aqueous phase activated carbon adsorption is presented in which the carbon particle is separated into rapidly and slowly diffusing regions. The model was developed to overcome problems arising from a single rate parameter analysis and is shown to describe experimental data well. In addition to very different rates of transport in the two regions, parameters estimated by regression analysis indicated differences in the adsorptive characteristics.

ISSN:0001-1541    

DOI:10.1002/aic.690270106

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractInfinite dilution activity coefficients (γ∞) in binary liquid mixtures are data of wide practical and theoretical applicability, but their extensive use has been hindered by the experimental limitations of classical vapor‐liquid equilibrium techniques. Two new experimental methods for accurate γ∞determinations are presented. These techniques, both faster and more accurate than classical methods, are complementary, and their applicability to different types of binary systems is di

ISSN:0001-1541    

DOI:10.1002/aic.690270107

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractThe catalytic activity of supported V2O5‐alkalimetal sulfate catalysts was studied by oxidizing toluene and methanol to aldehydes and water. An isothermal, fixed‐bed reactor, operating at atmospheric pressure and temperatures of 320, 345, and 370°C, was used to obtain the reaction rate data for different partial pressure combinations of the reaction components of these two systems. Three different approaches, Langmuir‐Hinshelwood, Hinshelwood, and two‐step redox mechanisms, have been used to study the kinetics, with statistical data interp

ISSN:0001-1541    

DOI:10.1002/aic.690270108

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractThe pore‐bulk distribution coefficientKfor a solute species is calculated by modelling the solute molecules as hard spheres.Kis expanded in a virial‐type series in powers of the bulk‐phase concentration. The leading term is the Henry's law constant. The next two coefficients are reported for three pore s

ISSN:0001-1541    

DOI:10.1002/aic.690270109

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractKerosine or propane was injected near the base of a small, air‐fluidized bed of sand at 940°C. The fraction of fuel burnt within the bed was determined from a heat balance, for various particle sizes, fluidizing velocities, and bed depths.Assuming the initial formation of a train of fuel vapor bubbles, theoretical analysis indicated two stages of combustion: (1) rapid consumption of the oxygen initially between fuel vapor bubbles; (2) slow consumption of oxygen initially outside the fuel vapor region by radial diffusion of oxygen and fuel vapor, analogous to a diffusion flame.Comparison of experiment with theory gave effective radial diffusion coefficients of the same order of magnitude as the molecular diffusion coefficient. It was inferred that combustion occurs largely by a diffusion flame within the bed, with diffusion through the particulate phase being the rate‐controlling step. This explains why fuel distribution is so important in attaining efficient combus

ISSN:0001-1541    

DOI:10.1002/aic.690270110

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY

摘要:

AbstractOne of the most persistent obstacles in the study of oxygen mass transfer in bubble columns is the technical difficulty of using large liquid and gas flow rates economically. This experimental limitation is reflected in the present, very incomplete, understanding of the mass transfer characteristics of these two‐phase systems. In this work, a new experimental technique has been developed and used.The use of computer‐calculated concentration contour diagrams permitted a detailed study of the mass transfer characteristics of the zone near the distributor. No similar study has been reported in the literature until now. The ability of the axial dispersion and two‐zone models to describe the experimental data is analyzed.Finally, liquid side volumetric mass transfer coefficients have been calculated for both models. The results indicate thatKLaincreases, often linearly, with the superficial gas velocity. Furthermore, for the liquid‐phase range [0, 10] cm/s,KLahad a minimum atVl∼ 7.5 cm/s. For larger liquid superficial velocities, an increase inKLawas found. These observations were valid for the axial dispersion (ADM), plug flow (PFM) and two‐zone (T

ISSN:0001-1541    

DOI:10.1002/aic.690270111

出版商:American Institute of Chemical Engineers    

年代:1981

数据来源: WILEY