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A study of butyl acetate synthesis 3. Analysing adsorption on catalyst
Estudio de la síntesis de acetato de butilo - 3. Análisis de adsorción sobre el catalizador
DOI:
https://doi.org/10.15446/ing.investig.v26n1.14674Keywords:
ion exchange resins, sterification, butyl acetate, adsorption (en)resinas de intercambio, esterificación, acetato de butilo, adsorción (es)
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Reactive system (acetic acid-n-butanol-butyl acetate-water, in liquid phase, 0.76 Bar pressure) adsorption on a cationic exchange resin (Bayer Lewatit K-2431) was studied in this work. Solid particle size distribution was verified and low dispersion was noticed with 86% of total mass between 20 and 30 mesh. The dried solid showed a binodal distribution with 40% above 25 mesh and 45% between 25 and 45 mesh. Resin swelling assays were carried out on pure components and non-reactive binary mixtures and increased matrix volume was observed (2.2 to 3 times higher). Selective adsorption on the reactive system was observed in the sequence: water > n-butanol acid > acetate. Both ideal and non-ideal models were tested for calculating adsorption using a composite isotherm, demonstrating these models’ weakness in representing adsorption on ionic polymer matrices. Calorimetric characterisation assays were carried out on swelled catalyst and a change in solid structure caused by thermal treatment was recognised using infrared scanning.
En este trabajo se realizó un estudio de la adsorción del sistema reactivo: ácido acético - n-butanol - acetato de butilo - agua, en fase liquida y presión de 0.76 Bar, sobre una resina de intercambio catiónico (Bayer® Lewatit K-2431). Se verificó la distribución de tamaño de partícula del sólido y se observó baja dispersi6n con un 86% de la masa entre mallas 20 y 30. El sólido seco presenta una distribución binodal con un 40% por encima de la malla 25 y un 45% entre las mallas 25 y 40. Se desarrollaron pruebas de hinchamiento de la resina en los componentes puros y en mezclas binarias no reactivas, y se observó un aumento en el volumen de la matriz entre 2,2 y 3,8 veces. Se notó una adsorción selectiva en el sistema reactivo en el orden: agua > n-butanol ácido > acetato. Se evaluaron dos modelos de tipo ideal y no-ideal para cuantificar la adsorción a través de una isoterma compuesta, demostrando la debilidad de los modelos teóricos para representar la adsorción en matrices poliméricas iónicas. Finalmente, se desarrollaron ensayos de caracterización calorimétrica del catalizador hinchado, y se reconoció a través del análisis del espectro IR un cambio en la estructura del sólido debido al tratamiento térmico.
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Copyright (c) 2006 Álvaro Orjuela Londoño, Fernando Leiva Lenis, Luis Alejandro Boyacá Mendivelso, Gerardo Rodríguez Niño, Luis María Carballo Suárez
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