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The growth of a pure culture of microorganisms in a steady state fermentor is studied analytically. Processes involved in the life cycle of a single microbial cell form the basis of the treatment. Equations are developed which relate stochastic growth and reproductive processes on the cellular level to the behavior of the cell population. These equations are used to predict culture age distribution and metabolic rates in the steady state. The stability of the steady state is considered finally. Gos-liquid kinetics: the absorption of carbon dioxide in diethanolamine, Nunge, RichardAbstract: The absorption of carbon dioxide in pure diethanolamine was studied in a gas-liquid stirred reactor at 85", 95", and 105°F. Experimental data were consistent and reproducible.The experimental data were correlated with the simplified equation by both integral and differential methods and indicate that the reaction follows a third-order rate equation: first order in carbon dioxide and second order in diethanolamine. A mechanism explaining the observed order is described. Effects of solute purity, temperature, and surfactants on solid-liquid mass transfer, GhoshAbstract: The mass transfer coefficients for a process of solid dissolution vary with solute purity. The Reynolds and Schmidt number exponents which ore used in the usual dimensionless group correlations also depend on solute purity, even over a narrow range of only several percent, The effect of temperature on the mass transfer process may be attributed to Schmidt-number variation. Surfactants may increase or decrease the transfer rate or leave it unchanged; specific behavior depends on the solute purity as well as the concentration and ionic nature of the surfactant. h Performance of packed columns VII. The effect of holdup on gas-phase mass transfer rates, Shulman, H. L., C. G. Savini, and R.Abstract: To account for the differences in the gas-phase mass transfer coefficients obtained by the use of vaporization and absorption techniques, data were obtained for ring and saddle packings in a 12-in. diam. column employing water vaporization and methanol absorption. The ratio of the vaporization to absorption coefficient, corrected for differences in diffusivity, is found to be directly proportional to the ratio of the total holdup to the operating holdup thus confirming the proposed model in which the effective interfacial area for each type of operation is proportional to the holdup of the liquid active for that operation.Abstract: Reaction rate measurements were made for the ortho-para hydrogen conversion a t -196°C. and 1 atm. pressure with nickel oxide catalysts using alumina and silica gel as carriers. Data were obtained for fine particles and for larger particles and pellets where pore diffusion resistances were significant. From these data experimental effectiveness factors were evaluated.Theoretical effectiveness factors were predicted from measured properties of the pores in the catalysts and a previously developed theory. Comparison between experimental and theoret...

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