Block freeze concentration intensification by means of vacuum and microwave pulses

(Eng) Block freeze concentration has gained interest as a separation technology since it is simpler than the suspension process. However, it has not been implemented at an industrial level because its separation efficiency is lower than that of the traditional freeze concentration process. Therefore...

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Autores:
Pardo, J. Mauricio
Sánchez, Ricardo
Tipo de recurso:
Article of journal
Fecha de publicación:
2015
Institución:
Universidad del Valle
Repositorio:
Repositorio Digital Univalle
Idioma:
eng
OAI Identifier:
oai:bibliotecadigital.univalle.edu.co:10893/18432
Acceso en línea:
https://hdl.handle.net/10893/18432
Palabra clave:
Crioconcentración
Calentamiento por microondas
Eficiencia de separación
Vacío
Cryoconcentration
Microwave heating
Separation efficiency
Vacuum
Rights
closedAccess
License
http://purl.org/coar/access_right/c_14cb
Description
Summary:(Eng) Block freeze concentration has gained interest as a separation technology since it is simpler than the suspension process. However, it has not been implemented at an industrial level because its separation efficiency is lower than that of the traditional freeze concentration process. Therefore, numerous assisting techniques are being studied around the world to overcome this deficiency. In this paper, the combination of microwave heating and vacuum separation is being studied and compared with convection heating and gravity separation. Separation efficiency was measured using the cumulative concentration factor (CumCI) and the area under the curve defined by yield (Y) as a function of the thawed fraction (f). It has been observed that all treatments that used vacuum as separation method showed a higher efficiency than those in similar processing conditions that used gravity as the separation method. Regarding the effect of microwave pulses, it has been observed that pulses below 2.4 kJ increased the separation efficiency when combined with the hydrodynamic effect generated by the vacuum pulses.