ISSN:0001-1541    

DOI:10.1002/aic.690170202

出版商:American Institute of Chemical Engineers    

年代:1971

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690170205

出版商:American Institute of Chemical Engineers    

年代:1971

数据来源: WILEY

摘要:

AbstractRelationships have been developed for the calculation of second virial coefficients of polar fluids from the critical constants, acentric factorw, and fourth parameterxof the substance. Coefficients for the expansion of the reduced second virial coefficient inwandxare presented for 0.64 ≤TR≤ 0.94. Comparisons with available experimental data indicate that good results are obtained by the method of this study for most polar fluids. The second virial coefficient for water is found to exhibit anomalous behavior. Procedures have also been established for extending the relationships for pure fluids to the second virial coefficient of mixtures containing nonpolar or polar compone

ISSN:0001-1541    

DOI:10.1002/aic.690170206

出版商:American Institute of Chemical Engineers    

年代:1971

数据来源: WILEY

摘要:

AbstractConversion data for the reduction of nitric oxide with C1to C8hydrocarbons over a bariumpromoted copper chromite catalyst were obtained in an integral flow reactor operated at atmospheric pressure and temperatures of 225°C to 525°C. In general, an increase in carbon number in the hydrocarbon studied resulted in a decrease in the required temperature for a given nitric oxide conversion. For a given carbon number the required temperature for a given nitric oxide conversion decreased with degree of saturation. The data were fitted to empirical rate expression

ISSN:0001-1541    

DOI:10.1002/aic.690170207

出版商:American Institute of Chemical Engineers    

年代:1971

数据来源: WILEY

摘要:

AbstractThe kinetics of simultaneous, noncatalytic solid‐gas reaction systems has been analyzed in terms of the selectivity and effectiveness factor, based on the unreacted core shrinking model. The reaction systems discussed include the first‐order independent, parallel, and consecutive reactions with the simultaneous influences of heat and mass transfer. The effects of various chemical and transport properties on the stability, selectivity, and effectiveness factor of the system are discussed. The pseudosteady state approximation is employed to reduce the mathematical difficult

ISSN:0001-1541    

DOI:10.1002/aic.690170208

出版商:American Institute of Chemical Engineers    

年代:1971

数据来源: WILEY

摘要:

AbstractThe modification of the Blake‐Kozeny equation for porous media flow using the power law has been shown to hold for molten polymers as well as for the previous cases for polymer solutions. The present work extended the correlation of friction factor with Reynolds number an additional three decades.It was also shown, however, that the modified Blake‐Kozeny equation broke down when bed shear rates were in the range of excessive curvature on the polymer flow curves (shear stress‐shear rate). In such cases it is suggested that the Newtonian Blake‐Kozeny equation, together with apparent viscosity data, could be used to correlate such porous media flow of non‐Newtonians.Appearance of viscoelastic effects at the critical Deborah number value of 0.05 predicted earlier were not found to hold. The data of the present investigation show that such a critical value must be at least 0.19 or even higher. This result helps to resolve partially the anomalous results obtained by previous inve

ISSN:0001-1541    

DOI:10.1002/aic.690170209

出版商:American Institute of Chemical Engineers    

年代:1971

数据来源: WILEY

摘要:

AbstractThe following nucleation rate and growth rate relationships for the aqueous, continuous, cooling crystallization of potassium dichromate were determined from experimental crystal size distributions:J= 3.9 × 1010(C–Ceq)0.9;r= 3.0 × 103(C–Ceq)1.7. Since nucleation rate is of lower kinetic order than growth rate, higher levels of supersaturation will yield crystal distributions with a larger mean size. Therefore for this system, batch or plug‐flow reactors are preferred to continuous‐stir

ISSN:0001-1541    

DOI:10.1002/aic.690170210

出版商:American Institute of Chemical Engineers    

年代:1971

数据来源: WILEY

摘要:

AbstractA secondary concentric cylinders cell was used to measure the thermal conductivity of binary mixtures of argon‐nitrogen, argon‐helium, and argon‐neon approximately 20, 40, 60, and 80 vol. % at 75°C, and pressures to 2,800 atm. Measurements were made also on the pure gases argon and ni

ISSN:0001-1541    

DOI:10.1002/aic.690170211

出版商:American Institute of Chemical Engineers    

年代:1971

数据来源: WILEY

摘要:

AbstractAn analysis is made of the Van der Waals forces of two different species when separated by a third continuous component. Results show that under certain circumstances, attractions as well as repulsions can exist between the two different species. The theory is applied to a fibrous bed coalescer to determine what type of material would best serve as a coalescence medium.

ISSN:0001-1541    

DOI:10.1002/aic.690170212

出版商:American Institute of Chemical Engineers    

年代:1971

数据来源: WILEY

摘要:

AbstractThe rates of diffusion of CH4,nC4H10, iso‐C4H10, and C4F10into well‐characterized single crystals of sodium mordenite were studied at 25°C to 100°C., using a rapidly responding constant‐volume system. The diffusion coefficients are of the order of 10−8to 10−9sq. cm/sec. and exhibit a maximum value with time, probably due to an initial temperature increase caused by the heat of sorption. The implications to catalysis of these and other studies of diffusion in zeolites ar

ISSN:0001-1541    

DOI:10.1002/aic.690170213

出版商:American Institute of Chemical Engineers    

年代:1971

数据来源: WILEY