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Influence des propriétés thermiques des algues brunes (Saccharina latissima) sur le processus de lyophilisation atmosphérique dans un lit fluidisé.

Influence of thermal properties of brown seaweeds (Saccharina Latissima) on atmospheric freeze-drying process in fluidized bed.

Numéro : pap. n. 574

Auteurs : TOLSTOREBROV I., EIKEVIK T. M., SAETHER M.

Résumé

Study explains the influence of thermal properties on the atmospheric freeze-drying process of brown seaweeds in fluidized bed, especially on fluidization, that is important for efficient and rapid drying. Two different types of raw materials (washed and raw) were investigated using differential scanning calorimetry technique. Raw seaweeds contained high amount of salts and water soluble fraction on the surface, that influences significantly the amount of unfrozen water at low temperatures (up to 11.6 % w.b. at -25.0 °C), while washed seaweeds showed almost complete freezing without significant depressing of freezing point. The diagram that shows the amount of ice with respect to temperature and total moisture content was obtained. The efficient drying process can be obtained using washed seaweeds, which do not contain water-soluble elements on the surface, while raw seaweeds showed agglomeration of particles during drying, due to significant depression of freezing point.

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Pages : 8

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Détails

  • Titre original : Influence of thermal properties of brown seaweeds (Saccharina Latissima) on atmospheric freeze-drying process in fluidized bed.
  • Identifiant de la fiche : 30026311
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0574

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