Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/196884
Type: Artigo de periódico
Title: Simulation And Optimization Of A Supercritical Extraction Process For Recovering Provitamin A.
Author: de Moraes, Elenise Bannwart
Alvarez, Mario Eusebio Torres
Maciel, Maria Regina Wolf
Maciel Filho, Rubens
Abstract: In this work, a simulation procedure of a supercritical extraction process was developed through the use of the commercial simulator HYSYS (Hyprotech Ltd.), adapting the existing units to the operating conditions typical of the supercritical extraction process. The objective is to recover provitamin A (beta-carotene) from palm oil (esterified) using carbon dioxide/ethanol as the supercritical mixed solvent. This example characterizes the problem for recovering high added value product from natural sources, as the palm oil, which is desired by the market. Owing to the fact that esterified palm oil is a complex mixture, made by several components, in order to characterize this system in the simulator, it was necessary to create hypothetical components using the UNIFAC (universal function-group activity coefficients model) group contribution, because they are not present in a conventional database and, then, their physical properties must be estimated and/or predicted before the simulation. The optimization was carried out in each simulation for each equipment, in terms of operating conditions (temperature and pressure), in order to obtain the maximum recovery of carotenes. According to the results, it was possible to concentrate carotenes through two cycles of supercritical extraction with high yield. Furthermore, ethyl esters (biodiesel) were also obtained, as a byproduct of the proposed process, which can also be used as an alternative fuel, with the important characteristic that it is renewable.
Subject: Carbon Dioxide
Chemical Fractionation
Chromatography, High Pressure Liquid
Computer Simulation
Ethanol
Models, Chemical
Models, Molecular
Plant Oils
Steam
Vitamin A
Beta Carotene
Rights: fechado
Identifier DOI: 
Address: http://www.ncbi.nlm.nih.gov/pubmed/16915711
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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