ISSN:0001-1541    

DOI:10.1002/aic.690190303

出版商:American Institute of Chemical Engineers    

年代:1973

数据来源: WILEY

摘要:

AbstractRaw rice hulls contain about 20% silica in very finely dispersed form. Pyrolyzed hulls can be chlorinated at 1000°C to give a nearly quantitative yield of silicon tetrachloride free of most other inorganic chlorides. Solid, organic, chlorine‐containing species have been found to be reaction intermediates. Commercial application appears economically attracti

ISSN:0001-1541    

DOI:10.1002/aic.690190304

出版商:American Institute of Chemical Engineers    

年代:1973

数据来源: WILEY

摘要:

AbstractAtactic polystyrene was molded at pressures up to 3000 atmospheres, and the effects of this pressure history were studied by permeability measurements using helium, neon, and argon as probe molecules. The permeabilities were significantly reduced by molding at higher pressures. The diffusion coefficients decreased monotonically with molding pressure, reflecting more extensive interchain cohesion. In contrast, the solubility coefficients showed a broad minimum around a molding pressure of 1000 atm, indicating that changes in local order were induced by higher pressures. These changes were shown to affect permeation, mechanical characteristics, and other properties. An optimum molding pressure somewhat below 1000 atm is indicated for polystyrene.

ISSN:0001-1541    

DOI:10.1002/aic.690190305

出版商:American Institute of Chemical Engineers    

年代:1973

数据来源: WILEY

摘要:

AbstractThe theory of adsorption from binary liquid mixtures on solids is extended to an arbitrary number of components. An equation for the surface excess is derived in terms of the free energy of immersion of the adsorbent, the capacity of the adsorbent at saturation, and activity coefficients in the bulk and adsorbed phases.Experimental data are reported for adsorption from binary and ternary liquid mixtures of benzene, ethyl acetate, and cyclohexane on activated carbon at 30°C. These systems exhibit nonidealities in the adsorbed phase. The theory provides accurate estimates of adsorption from the ternary mixture using data for adsorption from binaries

ISSN:0001-1541    

DOI:10.1002/aic.690190306

出版商:American Institute of Chemical Engineers    

年代:1973

数据来源: WILEY

摘要:

AbstractA model of radiant energy emission for tridimensional sources has been developed and used to predict radiation flux density profiles in an annular photochemical reactor. This paper presents results for a reactor without dispersion or absorption effects; that is, reflexions and refractions have been neglected and the energy has been assumed to propagate in a transparent medium.Computed radiation profiles agree well with published experimental data in a similar lamp‐reactor set up.Also, the formulation does not introduce, as it is the case with all line models, any form of singularities in the prediction of radiation flux density values.Finally, a parametric study of the effects of lamp dimensions on the shape of the radiation profiles was also mad

ISSN:0001-1541    

DOI:10.1002/aic.690190307

出版商:American Institute of Chemical Engineers    

年代:1973

数据来源: WILEY

摘要:

AbstractA new approach for the lumping analysis of reversible and/or irreversible monomolecular reaction systems (MRS) with constant or time‐dependent rate coefficients in discrete and continuous mixtures is presented. The observer theory initiated by Luenberger is proposed and extended to obtain the necessary and sufficient conditions of exact and approximate lumping of such systems. Examples are given to illustrate the implications of lumping and to demonstrate the generality and promising aspects of the observer approach. It is shown that this theory is a unifying method for the lumping analysis of MRS. New insights on lumping analysis are discusse

ISSN:0001-1541    

DOI:10.1002/aic.690190308

出版商:American Institute of Chemical Engineers    

年代:1973

数据来源: WILEY

摘要:

AbstractThe effect of specific gravity differences as a primary factor of nonideal mixing was investigated and demonstrated by means of a combined M‐T (mixed‐tubular) reactor in a simple cylindrical flow tank. Specific gravity differences were provided by a temperature gradient created by a strongly exothermic, second‐order adiabatic chemical reaction. The results also allow investigation of the effects of the inlet feed rate, agitator diameter, and speed on the agitator fraction of the combined re

ISSN:0001-1541    

DOI:10.1002/aic.690190309

出版商:American Institute of Chemical Engineers    

年代:1973

数据来源: WILEY

摘要:

AbstractA critical evaluation and modification of the available methods for the estimation of critical properties of pure hydrocarbons was undertaken to determine the most accurate method which has general applicability with minimum input data. As a result of the study, the method of Nokay as modified by the authors is recommended for the estimation of critical temperature while the method of Reidel is the best general method for critical volume. For critical pressure the Lydersen method is preferred for saturated hydrocarbons, while the method of Forman and Thodos is somewhat better for unsaturated hydrocarbons.

ISSN:0001-1541    

DOI:10.1002/aic.690190310

出版商:American Institute of Chemical Engineers    

年代:1973

数据来源: WILEY

摘要:

AbstractThe Marker‐and‐Cell numerical technique has been adapted to develop a method of solution for three‐dimensional, unconfined, isothermal flow of a highly viscous, Newtonian fluid in a region bounded by two, nonparallel traveling surfaces. Results are reported only for plane and elliptical surfaces, but the analysis is general enough to handle any shape of interest.A computer program was developed which can be used to generate and plot the flow and pressure fields. Numerical results were obtained for the special case of symmetrically opposed convergent surfaces for a wide range of condi

ISSN:0001-1541    

DOI:10.1002/aic.690190311

出版商:American Institute of Chemical Engineers    

年代:1973

数据来源: WILEY

摘要:

AbstractA new correlation method for binary gaseous diffusion coefficients from very low temperatures to 10,000 K is proposed based on an extended principle of corresponding states, and having greater range and accuracy than previous correlations. There are two correlation parameters that are related to other physical quantities and that are predictable in the absence of diffusion measurements. Quantum effects and composition dependence are included, but high‐pressure effects are not. The results are directly applicable to multicomponent mixture

ISSN:0001-1541    

DOI:10.1002/aic.690190312

出版商:American Institute of Chemical Engineers    

年代:1973

数据来源: WILEY