| 摘要 |
PURPOSE:To completely remove organic sulfur compounds which are hard to separate, by simple operation and to purify the titled compound useful as a raw material for drugs, etc., in high yield, by adding a hydroxyalkylamine derivative to crude naphthalene, melting under heating, cooling and separating precipitated crystal. CONSTITUTION:Crude naphthalene is blended with a hydroxyalkylamine derivative, preferably monoethanolamine, diethanolamine, triethanolamine, propanolamine, etc. Then the naphthalene is melted under heating preferably about 80 deg.C and cooled (to preferably 10-20 deg.C) to precipitate crystal. The crystal is separated to give purified naphthalene. The amount of the hydroxylamine derivative used in the reaction is 2-6 times, preferably 2-4 times as much as that of the crude naphthalene. A solvent for removing monoethanolamine attached to the separated naphthalene is hexane, etc.
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