Reversible stoichiometric reactions defined

When the titration curve is symmetrical about the equivalence point the end point, defined by the maximum value of AE/AV, is identical with the true stoichiometrical equivalence point. A symmetrical titration curve is obtained when the indicator electrode is reversible and when in the titration reaction one mole or ion of the titrant reagent reacts with one mole or ion of the substance titrated. Asymmetrical titration curves result when the number of molecules or ions of the reagent and the substance titrated are unequal in the titration reaction, e.g. in the reaction... 

The model also assumes that physiologically reversible reactions operate in either direction. Here the reactions PGI (reaction 2), TRALD (reaction 6), TRKET (reaction 7), PGK (reaction 8), PGM (reaction 9), LACDH (reaction 14), PFLASE (reaction 15), PTACET (reaction 16), ACO (reaction 22), ISODH (reaction 23), SCOASN (reaction 26), FUMARASE (reaction 28), TRANSH2 (reaction 32), and ATPASE (reaction 39) are considered reversible. The fluxes of all other reactions are constrained to operate in the direction defined as positive by the stoichiometric matrix. 

The results given in Section 9.3.2 for the thermal cracking of naphtha and of a mixture of ethane-propane were obtained with very detailed radical kinetic schemes for these processes [Willems and Froment, 1988a, b]. The present problem formulates ethane cracking in terms of a drastically simplified molecular model containing 7 reactions. This reaction scheme and the corresponding kinetic model was derived from the radical scheme developed by Sundaram and Froment [1977]. Table 1 gives the kinetic parameters of these reactions. It should be mentioned that the kinetic parameters for the reverse reactions (2) and (5) were obtained from equilibrium data. Table 2 is the matrix of stoichiometric coefficients ay defined by... 

Add the components ethanol, diethylamine, triethylamine, and water to the reaction. Make the stoichiometric coefficients -1 for ethanol and dieth-lyamine (because they are being consumed) and 1 for both triethylamine and water (because they are being produced with a stoichiometry of 1). The forward order is automatically defaulted to the stoichiometric number 1 for this case, it is different than how we defined our reaction data. Assume no reverse reactions. Change the reaction order to 2 with respect to ethanol and 0 with respect to diethylamine for the forward reaction order. Since the reaction is irreversible, under Rev Order, type zero for all components. 

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