Resumo

BENAVIDES-PRADA, Omar Andrés  e  MUVDI-NOVA, Carlos Jesús. Evaluación de la ósmosis inversa y de la evaporación de película ascendente como técnicas de concentración de hidrolizados de almidón de yuca. Rev. ion [online]. 2014, vol.27, n.1, pp.59-70. ISSN 0120-100X.

During the production of glucose syrup from yucca starch, the concentration step carries the highest energy costs in the process. Membrane technology (reverse osmosis) and unconventional evaporation methods (climbing film evaporation) arise as alternatives to traditional evaporation, because they are more energy efficient process. In this study, feed glucose solutions were used at 0.1 and 0.4g/ml. In the case of reverse osmosis, Filmtec^® and PCI^® membranes were used at 22 and 35.5°C and 21 and 37.5 bar of transmembrane pressure. For climbing film evaporation, pressures of 100 and 200bar and temperatures of 105 and 115°C were evaluated. With respect to reverse osmosis, the best results were obtained at 37.5bar and 35.5°C (higher transmembrane pressure and higher temperature), obtaining a volumetric concentration factor of 3.3 in 18min (with an initial glucose concentration of 10%w). Due to the final concentration reached (<25%w), this method would be classified as pre-concentration technique. Climbing film evaporation showed energy requirements low to 3500kJ/kg evaporated water (1.48 times over for pure water at the same pressure conditions). In terms of feed, results showed the supplied energy was low to 1900kJ/kg of feed solution; likewise, concentration factors of this technique did not depend meanly on the operating conditions tested.

Palavras-chave : glucose syrups; starch hydrolyzed; reverse osmosis; climbing film evaporationn.

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