Journal•ISSN: 0009-2509

# Chemical Engineering Science

About: Chemical Engineering Science is an academic journal. The journal publishes majorly in the area(s): Mass transfer & Bubble. It has an ISSN identifier of 0009-2509. Over the lifetime, 25326 publication(s) have been published receiving 845508 citation(s).

Topics: Mass transfer, Bubble, Catalysis, Fluidized bed, Heat transfer

##### Papers published on a yearly basis

##### Papers

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Abstract: A modified Redlich-Kwong equation of state is proposed. Vapor pressures of pure com- pounds can be closely reproduced by assuming the parameter a in the original equation to be tempera- ture-dependent. With the introduction of the acentric factor as a third parameter, a generalized correla- tion for the modified parameter can be derived. It applies to all nonpolar compounds. With the application of the original generalized mixing rules, the proposed equation can be extended successfully to multicomponent-VLE calculations, for mixtures of nonpolar substances, with the exclusion of carbon dioxide. Less accurate results are obtained for hydrogen-containing mixtures.

4,853 citations

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Abstract: When a fluid flows through a vessel at a constant rate, either “piston-flow” or perfect mixing is usually assumed. In practice many systems do not conform to either of these assumptions, so that calculations based on them may be inaccurate. It is explained how distribution-functions for residence-times can be defined and measured for actual systems. Open and packed tubes are discussed as systems about which predictions can be made. The use of the distribution-functions is illustrated by showing how they can be used to calculate the efficiencies of reactors and blenders. It is shown how models may be used to predict the distribution of residence-times in large systems.

1,842 citations

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Abstract: Summary All technically interesting reactions carried out with vanadium oxide catalysts are marked by their highly exothermic character, which forms an impediment to the investigation of the kinetics of these processes. In the present study use was made of a fluid bed, in which the temperature is uniform. The oxidation of the following substances: benzene, toluene, naphthalene, and anthracene has been studied. The partial pressures of the reacting substances were varied to the greatest possible extent. Both reaction components appeared to influence the reaction rate. A formula depicting this influence is derived. This formula may be interpreted by assuming two successive reactions, namely the reaction between the aromatic and the oxygen on the surface, and the re-oxidation of the partly reduced surface by means of oxygen. The formula may be reduced to an equation by which also the data on the oxidation of sulphur dioxide by means of vanadium oxide catalysts found in the literature are well described. Using kinetic data it is possible to determine the optimum temperature distribution in a fixed bed reactor used for the oxidation of sulphur dioxide and to make calculations of the ratio between the amounts of catalyst to be used in the various stages of a multiple-stage reactor. The results of these calculations have been compared with practical experience.

1,444 citations

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Abstract: Bipolar co-ordinates are employed to obtain “exact” solutions of the equations of slow, viscous flow for the steady motion of a solid sphere towards or away from a plane surface of infinite extent. Two cases are considered: (i) the plane surface is rigid and fluid adheres to its surface; (ii) the plane is a free surface on which the tangential stresses vanish. Deformation of the surface in the latter case is neglected. Numerical results are provided for the corrections to Stokes' law necessitated by the presence of the plane boundary at a finite distance from the particle. Application of the results to end-effect correlations in the falling-ball viscometer are discussed.

1,419 citations

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Abstract: Summary--When a fluid flows through a vessel at a constant rate, either "piston-flow" or perfect mixing is usually assumed. In practice, many systems do not conform to either of these assumptions, so that calculations based on them may be inaccurate. It is explained how distribution-functions for residencetimes can be defined and measured for actual systems. Open and packed tubes are discussed as systems about which predictions can be made. The use of the distribution-functions is illustrated by showing how they can be used to calculate the etficiencies of reactors and blenders. It is shown how models may be used to predict the distribution of residence-times in large systems.

1,394 citations