Propane-butane mixture partial oxidation

The best olefin yields were observed over Pt-coated monoliths. In the case of ethane/02 mixtures, selectivities to ethylene up to 65% at 70% ethane conversion and complete O2 conversion were reported." The oxidative dehydrogenation of propane and -butane produced total olefin select vies of about 60% (mixtures of ethylene and propylene) with high paraffin conversions." " Mixtures of ethylene, propylene and 1-butene were observed by the partial oxidation of -pentane and n-hexane ethylene, cyclohexene, butadiene and propylene were the most abundant products of the partial oxidation of cyclohexane." ... 

By the middle of the last century, the partial oxidation of methane and, later, propane, butane, and mixtures thereof extracted from oil-associated, crude stabilization, and processing gases became a widespread petrochemical process in the United States [28]. 

These calculations make it possible to estimate the yields of H2 and CO for the heavier hydrocarbons, such as propane and butane, direct kinetic calculations for which are difficult to perform because of the lack of reliable kinetic models of their oxidation under these conditions. Assmning that the dependences displayed in Fig. 12.4 hold for other hydrocarbons, one estimate the )delds of H2 and CO from propane and butane oxidation by using H C = 2.67 for propane and H C = 2.5 for butane. Thus, the main factor determining the )delds of H2 and CO in the homogeneous partial oxidation of hydrocarbons to syngas is the mixture composition. The optimal composition of the mixture and the corresponding maximum yields of the conversion products are determined by the specific conditions of the partial oxidation of the hydrocarbon. 

Caprio et al. [18] measured heat release rates from i-butane oxidation at 100 kPa in the reactant mixture [i-C4Hio] [O2] [N2] = 1 2 1 (Fig. 6.6). A considerably higher heat release rate than that from propane occurred in this system despite the lower partial pressure of reactant. It seems likely that the differences in residence times in the respective experiments is contributory since variations in the heat release rate from i-butane oxidation were obtained when the mean residence time was changed [18]. However, Lignola et al. [47] showed that, at constant tres, the heat release rate from primary reference fuel mixtures, comprising i-CgHig and n-C7H16, depended on the proportions of the fuel components (Fig. 6.6). 

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