| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple method for the purification of crystals by using a purification column and provide a purification apparatus having a simple structure free from a driving part in the column. SOLUTION: The crystal purifying apparatus has a crystal filling part B formed in a vertical cylindrical column body of a purification column, a feeding part 23 to feed stock crystals to the crystal filling part and an extraction part 28A to extract a liquid heating medium containing impurities and the purified crystals from the crystal filling part B in liquid state. The feeding part 23 is positioned at or near the top of the column body 11 and the extraction part 28A is positioned at the bottom part of the column body 11. A filtering apparatus 21 for passing the liquid heating medium containing impurities and the purified crystals in liquid state is placed above the extraction part 28A, and the stock crystals are heated and melted with a heating means at the upper part of the column body 11. COPYRIGHT: (C)2006,JPO&NCIPI
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