Design equations dehydrogenation

Table 9.4 Design equations for the membrane reactor for oxidative dehydrogenation of butane... 

Table 9.5 Design equations for the integrated Pd/Ag membrane reactor for the coupling reaction of ethylbenzene dehydrogenation and nitrobenzene hydrogenation... 

These are slightly simplified forms of the equations which Jeffreys solves by finite differences using a step length of = 0.0722. The added complication that Jeffreys faces in his very full treatment of the design of this plant is that there are side reactions by which the ketene can be decomposed and the acetone can be dehydrogenated. The complete set of reactions is... 

In conclusion, the Box-Wilson composite design is a convenient method for modeling of product yield as a function of reaction parameters (independent variables) especially when their number exceeds 2. In the dehydrogenation of n-decane, effect of reaction parameters on monoene selectivity / yield and n-decane conversion are represented satisfactorily by full II degree polynomial equations. The canonical form of the equations in the present study is indicative of an approximately stationary ridged system, with the reaction parameters close to center of design being optimum for monoene yield at conversion levels of 12 - 13 %. The polynomial equations were found to be consistent, with mechanistic considerations. 

The equations shown in Table 3.2 deal with variants on monomolecular or bimolecular reaction rate equations in general A to D terms. For a more concrete example in terms of chemical species, let us consider the speeifie ease of the dehydrogenation of butene to butadiene over a chromia/alumina eatalyst as detailed by Dumez and Froment [F.J. Dumez and G.F. Froment, Ind. Eng. Chem. Proc. Design Devel., 15, 291 (1976)]. In Table 3.3a is a number of reaetion sehemes for dehydrogenation classified as to atomic or molecular with the various possibilities listed as to the nature of the hydrogen recombination, (a)-(e), and with subdivisions as to... 

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