Crystallization method and crystallization apparatus
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United States of America Patent
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Apr 23, 2013
Grant Date -
Jun 16, 2011
app pub date -
Nov 30, 2010
filing date -
Dec 11, 2009
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Abstract
A crystallization method includes: actually measuring a particle number of the crystals precipitated from the saturated solution and a concentration of the saturated solution, while cooling the solution according to a cooling temperature profile; calculating an absolute particle number of crystals precipitated from the saturated solution according to a mass balance, based on an actual measurement value of the particle number and an actual measurement value of the concentration; heating the saturated solution when the absolute particle number exceeds a threshold to perform heating control so that the absolute particle number becomes a set value; and cooling the saturated solution again according to a preset cooling temperature profile after controlling to dissolve excessive crystals in the solution so that the absolute particle number returns to the set value.
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