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Proceedings of the 1986 International Congress on Renewable Energy Sources. Enhancement of yield of chemical products by heating using concentrated solar energy. International Congress on Renewable Energy Sources [18-23 Mayo 1986, Madrid].


v. 2

It is known that if a mixture of reacting chemicals is kept for a sufficiently long period of time at constant temperature and density, then it will come to an equilibrium condition. The corresponding concentrations of the constituent chemicals are determined by the rate constants of the various reactions. These rate constants are functions of density and temperature. For fixed density, for example, there will be a temperature at which the equilibrium concentration of one of the constituent chemicals will be maximun. It has been suggested that, after slowly heating a reacting mixture to the temperature at which one of the constituents (the desired chemical) has its maximun equilibrium concentration, further rapid heating can result in achieving even higher concentrations, which can then also be frozen by rapid cooling. Not all chemical mixtures exhibit this response to rapid heating, but for those that do the yield of the desireable chemical may be enhaced by a significant amount. In such processes solar energy can be used as an energy source for heating. This study has two purposes: first, to identify some chemical reactions that can benefit from rapid heating and cooling, resulting in desirable products; and second, to determine, from a simple physical model, the rate of heating by using a gas/particle mixture passing through concentrated solar flux. The kinetic aspects of the chemical reactions, such as NO formation from N2-O2 mixtures and the H2S decomposition, will be analyzed in detail, by resolving the differential equations which gobern these reactions. (Para más información ver documento). ABSTRACT. INTRODUCTION. METHOD. RESULTS. N2-O2 system. H2S system. REFERENCES.

Presenta tbls., gráfs. y diagrs.

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