Method and apparatus for freezeconcentrating substances
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United States of America Patent
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Jun 19, 2001
Grant Date -
N/A
app pub date -
Dec 17, 1998
filing date -
Dec 18, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a crystallization apparatus and to a method for crystallizing a liquid from a solution, a mixture of liquids or a suspension. The apparatus comprises a growth zone in a vertically positioned tank, which growth zone is positioned below a nucleation zone. Via a delivery line the seed crystals are fed from the nucleation zone to the bottom end of the growth zone. In the growth zone the ice slurry slowly moves in a vertical direction at such a low velocity that heavier particles are able to precipitate and to be discharged at the bottom end. Preferentially, the nucleation zone comprises a vacuum apparatus for effecting a reduction in pressure in the nucleation zone to between 10.sup.-4 and 7.multidot.10.sup.-3 bar. Using the apparatus according to the present invention it is possible for waste water and effluent to be concentrated in a simple manner, clogging of, for example, filters owing to the settling of solid particles being prevented.
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