ISSN:0001-1541    

DOI:10.1002/aic.690030422

出版商:American Institute of Chemical Engineers    

年代:1957

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690030423

出版商:American Institute of Chemical Engineers    

年代:1957

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690030424

出版商:American Institute of Chemical Engineers    

年代:1957

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690030425

出版商:American Institute of Chemical Engineers    

年代:1957

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690030402

出版商:American Institute of Chemical Engineers    

年代:1957

数据来源: WILEY

摘要:

AbstractThis paper proposes a theory of filter‐cake washing on continous filtration equipment based upon the assumption that mixing of the strong liquor and wash fluid is controlling. The theory can be conventiently applied to experimental filtration leaf tests for determining wash efficiency and is easily extrapolated to full‐scale results with the normally experienced uneven cake thickness and wash‐fluid distribution taken into account.To obtain the necessary wash‐fluid volume for proper soluble removal, a correlation method of wash time as a function of wash ratio with parameters of cake‐formation time has been derived from commonly accepted filtration theory. Experimental and plant data indicate a close agreement with the theory, and the method can be employed to predict filtration rate as a function of wash ratio. A typical illustration has been given to determine filtration requirements for recovering soluble uranium after leaching of the ore by continuous filtration. Washing rate was proved to be conrolling, and this design based only on cake‐formation rate would yield insufficient wash ratios and excessive soluble uranium loss. Final filter and flow‐sheet design must be based on uranium recovery which can be predicted by the pro

ISSN:0001-1541    

DOI:10.1002/aic.690030403

出版商:American Institute of Chemical Engineers    

年代:1957

数据来源: WILEY

摘要:

AbstractThe problem of axial mixing in straight pipes is analyzed by a modification of G. I. Taylor's analysis. The treatment presented here includes the effect of both Schmidt and Reynolds numbers throughout the turbulent‐flow range. All applicable data on flow of gases and liquids are found to confirm the validity of the method.The analysis indicates that axial mixing increases rapidly as the flow approaches the laminar region, especially for liquids, and that pipe roughness causes a relatively small increase in axial mixing. Turbulent eddy diffusion in the axial direction has a negligible effect.The results of the analysis are applicable to those systems wherein the kinematic viscosity of the flowing mixture does not vary greatly from one region to another and in which the concentration region of interest is spread out along a sufficient length of pipe. These limitations are broad enough to permit most practical problems to be treated by the metho

ISSN:0001-1541    

DOI:10.1002/aic.690030404

出版商:American Institute of Chemical Engineers    

年代:1957

数据来源: WILEY

摘要:

AbstractA method is presented for the analysis of a reaction between a porous solid and a gaseous reactant where the kinetic expression is linear in the concentration and where appreciable concentration gradients are established in the pore system as a result of diffusive transport rate. Two cases are treated mathematically: a single cylindrical pore initially of uniform diameter and a porous solid initially containing uniform cylindrical pores with random intersections. The mathematical solutions to the latter case are used to interpret the experimental results reported in the literature on the gasification of graphite rods with carbon dioxide. Values of the computed effective diffusivity are an order of magnitude smaller than the bulk diffusivity at the same temperature and pressure.

ISSN:0001-1541    

DOI:10.1002/aic.690030405

出版商:American Institute of Chemical Engineers    

年代:1957

数据来源: WILEY

摘要:

AbstractThe production and refining of petroleum involve many processes in which conditions deviate markedly from equilibrium. For prediction of the behavior of such nonequilibrium systems, information concerning the molecular‐transport characteristics of the paraffin hydrocarbons is of practical interest.Fick diffusion coefficients for methane were measured in the liquid phase of the methane–n‐heptane system at temperatures between 40° and 340°F. at pressures up to 3,500 lb./sq. in., but the pressure range was limited at the higher temperatures by approach to the critical state of this binary system.The measurements obtained confirmed the fact that the Fick diffusion coefficients for methane decrease with an increase in the concentration of this component and increase rapidly with an increase in temperature for a constant composition. These data together with similar information for other binary paraffin hydrocarbon systems indicate that the Fick diffusion coefficients for methane decrease with an increase in the molecular weight of the less volatile co

ISSN:0001-1541    

DOI:10.1002/aic.690030406

出版商:American Institute of Chemical Engineers    

年代:1957

数据来源: WILEY

摘要:

AbstractThe fragmentary thermal‐conductivity data for argon available in the literature have been correlated by use of a residual thermal conductivityk–k* vs. density ρ relationship. This correlation produced a unique continuous curve which was found to be singularly independent of temperature and pressure for both gaseous‐ and liquid‐state data. From low‐pressure thermal‐conductivity valuesk* and the relationship given above, it is possible to determine thermal conductivities at any condition of temperature and pressure for which a corresponding density is available. This procedure was used to calculate reliable thermal conductivitieskfor high‐pressure regions where experimental data were lacking.In a similar manner the critical thermal conductivitykcfor argon was established directly from the critical density and the quantityk T c*. Thekcvalue permitted the calculation of reduced thermal conductivitieskRand made possible the construction of an extensive reduced‐state chart. Although this correlation was developed mainly from data for argon, it was found to apply equally as well to the other inert gases as postulated from the theory of corresponding states.A comparison of thermal conductivities calculated from the reduced‐state plot with over 200 experimental points produced an average deviation of 1.8% for all the inert gases. This chart was also found applicable to the diatomic gases and their mixtures but produced significant deviations for substances having more than

ISSN:0001-1541    

DOI:10.1002/aic.690030407

出版商:American Institute of Chemical Engineers    

年代:1957

数据来源: WILEY