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Artículo

Improving the purification of hydroxyethyl starch by means of supercritical and near-critical fluid extraction using CO2 and a mixture of CO2-ethanol: A combined experimental and modeling study

Piqueras, Cristian MartinIcon ; Eberhardt, Andrea MarielIcon ; Vega, Daniel AlbertoIcon ; Damiani, Daniel EduardoIcon
Fecha de publicación: 20/11/2014
Editorial: Elsevier Science
Revista: Chemical Engineering And Processing
ISSN: 0255-2701
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ingeniería Química

Resumen

The hydroxyethyl starch purification was performed by means of supercritical and near-critical fluid extraction within single-phase conditions using CO2 and a mixture of CO2?ethanol. Hydroxyethyl starch with concentrations of ethylene glycol in the range of 28,000 to 3000 ppm was successfully purified in a single stage. The intraparticle mass transfer was determined through a hot sphere diffusion model. The values of the effective diffusion coefficients, obtained from the model fitted to experimental data, indicate that the hindrance for ethylene glycol extraction is due to mass transfer limitations attributed to the closed pore structure generated during the crystallization of the solid. In the same sense, the strong interaction between the contaminant and the hydroxyethyl starch at specific points of the surface could also be a detrimental factor. We show that, under these working conditions, most of the contamination can be removed, providing a simple process which saves the high consumptions of deionized water employed in the traditional ultrafiltration.
Palabras clave: Hydroxyethyl Starch , Supercritical Carbon Dioxide , Ethylene Glycol , Purification
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/24927
URL: http://www.sciencedirect.com/science/article/pii/S0255270114002499
DOI: http://dx.doi.org/10.1016/j.cep.2014.11.012
Colecciones
Articulos(IFISUR)
Articulos de INSTITUTO DE FISICA DEL SUR
Articulos(PLAPIQUI)
Articulos de PLANTA PILOTO DE INGENIERIA QUIMICA (I)
Citación
Piqueras, Cristian Martin; Eberhardt, Andrea Mariel; Vega, Daniel Alberto; Damiani, Daniel Eduardo; Improving the purification of hydroxyethyl starch by means of supercritical and near-critical fluid extraction using CO2 and a mixture of CO2-ethanol: A combined experimental and modeling study; Elsevier Science; Chemical Engineering And Processing; 88; 20-11-2014; 89-98
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