Continuous system of freeze concentration of sucrose solutions: Process parameters and energy consumption
Tipus de documentArticle
Data publicació2017-01
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Abstract
Continuous processes to freeze-concentrate aqueous solutions of sucrose are proposed that
integrates the falling film technique, fractionated thawing, and block freeze-concentration.
Data reported in our previous studies were used to study the two first techniques. Block freeze
concentration tests were performed to recover the solutes present in the diluted fractions. Starting
with a solution with 5% w/w solids, a concentrated liquid with 20% w/w solids and an effluent
with 0.3% w/w solutes were obtained. The falling film freeze technique effectively concentrated
the sucrose solution. Fractionated thawing increased the recovery of solutes retained in the ice
from 39 to 50%. Block freeze concentration increased solute recovery to 95%. A concentration
index of 4.0 and a concentration efficiency of 98.5% were obtained by integrating the techniques.
Under the assumptions considered in this work, theoretically the energy consumption of the
process can reach a value of 10.3 kWh/1000 kg of ice removed, which represents a saving of 30%
compared to the energy consumption of the most efficient evaporation systems.
CitacióPazmiño, N., Raventos, M., Hernandez, E., Gulfo, R., Robles, C., Moreno, F., Ruiz, Y. Continuous system of freeze concentration of sucrose solutions: Process parameters and energy consumption. "Journal of Food Technology and Preservation", Gener 2017, vol. 1, núm. 1, p. 1-5.
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