Limiting Partition Coefficient in a Tubular Ice System for Progressive Freeze-concentration
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A tubular ice system is effective for the scale-up of progressive freeze-concentration. The effective partition coefficient, <I>K</I>, as an index for the effectiveness of progressive freeze-concentration, is defined by the ratio of solute in ice and liquid phase. <I>K</I> is dependent both on the ice crystal growth rate and the mass transfer coefficient at the ice-liquid interface, as described by the concentration polarization model. The limiting partition coefficient, <I>K<SUB>0</SUB></I>, corresponds to <I>K</I> at the infinitesimal ice crystal growth rate and/or infinite mass transfer at the interface. <I>K<SUB>0</SUB></I> is an important process parameter for progressive freeze-concentration. A method is proposed for determining <I>K<SUB>0</SUB></I> experimentally for a tubular ice system. K<I>0</I> increased with increase in the concentration of solute, which suggests that <I>K<SUB>0</SUB></I> is not determined by the equilibrium process but by the nonequilibrium process at the ice-liquid interface.
- Food Science and Technology International, Tokyo
Food Science and Technology International, Tokyo 14(3), 249-252, 2008-05-01
Japanese Society for Food Science and Technology