Hougen

Whiting E E, Schadee A, Tatum J B, Hougen J T and Nicholls R W 1980 Recommended conventions for defining transition moments and intensity factors in diatomic molecular spectra J. Moiec. Spectrosc. 80 249-56... 

The expressions for the rotational energy levels (i.e., also involving the end-over-end rotations, not considered in the previous works) of linear triatomic molecules in doublet and triplet II electronic states that take into account a spin orbit interaction and a vibronic coupling were derived in two milestone studies by Hougen [72,32]. In them, the isomorfic Hamiltonian was inboduced, which has later been widely used in treating linear molecules (see, e.g., [55]). 

FIG. 2-30 Entbalpy-concentration diagram for aqueous sulfuric acid at 1 atm. Reference states enthalpies of pure-bquid components at 32 F and vapor pressures are zero. NOTE It should be observed that the weight basis includes the vapor, which is particularly important in the two-phase region. The upper ends of the tie bnes in this region are assumed to be pure water. (Hougen and Watson, Chemical Process Principles, I, Wiley, New York, 1943. )... 

Details of the derivations of these and some other equations are presented by Yang and Hougen (Chem. Eng. Prog., 46, 146 [1950]),... 

In the case of exothermic reactions, underestimating the transfer coefficients makes the real gradients less than the estimated ones. As such, this makes our estimates conservative, in the sense that if a criterion calls gradients negligible then they surely are. The intent here is to do most of the kinetic study and catalyst testing at gradientless conditions and this book will make use of the Colburn-type correlations as developed by Hougen (1951) and his associates. 

Heterogeneous catalytic studies should also be concerned with the significance of adsorption and desorption rates and equilibria of the reactants, intermediates and products. Yang and Hougen (1950) tabulated the expressions for surface catalyzed reactions controlled by various steps. 

Those entries that incorporated the reversibility of the reaction in the kinetics came closer to the exact performance. Submission 5, L. H. Hosten and J. J. Perou, assistants of professor G. F. Froment at Gent, Belgium used the table of Yang and Hougen to assemble the model. They used only one temperature dependent term, the energy of activation. The value for this in their correlation was E= 30,376 cal/mol from 27 experimental results. This almost matches the results derived in Chapter 6.3 from 8 experimental results at 4 conditions. 

A. Hougen and K. M. Marshall Adsorption from a Fluid Stream Flowing Through a Stationary Granular Bed, Chemical Engineering Progress, 43 197 (1967). 

Yang, K. H. and Hougen, O. A. Determination of Meehanism of Catalyzed Gaseous Reaetions, Chemical Engineering Process, p. 146, Mareh 1950. 

Source O. Hougen, K. Watson, and R. 4. Ragatz, Chemical Process Prir... 

Hougen and Watson in an analysis of Kassel s data for the homogeneous, vapor-phase dehydrogenation of benzene in a tubular-flow reaetor eonsidered two reaetions ... 

Sinee the reaetor is isothermal, the equilibrium eonstants Kj and Kj are estimated at 1,400°F from equations developed by Hougen and Watson. The results are ... 

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