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Influence of Agitator Geometry in the Dissolution Kinetics of a Spherical Solid
Influencia de la geometría del agitador en la cinética de disolución de un sólido esférico
DOI:
https://doi.org/10.15446/ing.investig.94110Keywords:
solid dissolution constant, activation energy, agitator geometry, agitation rate (en)constante de disolución de sólidos, energía de activación, geometría del agitador, tasa de agitación (es)
An experimental study has been performed in order to establish both the effect of the agitator geometry and the agitation rate onthe dissolution kinetics of spherical candies. To do so, the dissolution constants were determined in aqueous solution by way ofthe Hixson-Crowell model on three types of agitators, namely, a paddle agitator of two blades, and two turbine agitators of four andsix blades respectively. Subsequently, for a fixed agitation rate the temperature was varied in order to experimentally determine theactivation energy for each agitator. It was found that while the geometry of the agitator has an effect on the pre-exponential factorsof the dissolution constant, the activation energy remains constant. Finally, differences on the dissolution constants as a functionof the angular frequency of the agitator were also found.
Se ha realizado un estudio experimental con el fin de establecer el efecto de la geometrıa de un agitador y su tasa de agitacion en lacinetica de disolucion de dulces esfericos. Para esto, las constantes de disolucion fueron determinadas en solucion acuosa usandoel modelo de Hixson–Crowell en tres tipos de agitadores, a saber, un agitador de paleta de dos aspas, y dos agitadores tipo turbinade cuatro y seis aspas respectivamente. Posteriormente, para una tasa fija de agitacion, se vario la temperatura con el proposito dedeterminar experimentalmente la energıa de activacion para cada agitador. Se encontro que mientras la geometrıa del agitador tieneun efecto en el factor pre-exponencial de la constante de disolucion, la energıa de activacion permanece constante. Finalmente,tambien se encontraron diferencias en las constantes de disolucion como funcion de la frecuencia angular del agitador.
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