| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique being suitably used for improving the thawing speed in a freeze-thaw concentration, and easily extracting a highly concentrated solution with ease in good yield. <P>SOLUTION: The present concentrated solution extracting method includes vertically placing a plate-like or pillar-like ice which is obtained by freezing an aqueous solution, and has a weight of ≥3 kg and a thickness of ≥2 cm, and thawing the product in an air temperature of ≤3.5°C so as to obtain a concentrated solution. In more details, the concentrated solution extracting method includes finishing a freezing process of freezing an aqueous solution when a temperature of the central part of the aqueous solution is lower by a prescribed temperature than a freezing point of the aqueous solution before concentrating, and thawing through vertically placing a container in which the aqueous solution is put. <P>COPYRIGHT: (C)2009,JPO&INPIT |
