反应详情

990 parts of the same crude β-naphthol as used in Example 2 were melted and added to 1,300 parts of ethanol under stirring, and the mixture was heated while stirring until the crude naphthol was completely dissolved. Then the solution was gradually cooled to 0° C. with crystals separating. The mixture was then filtered using a centrifuge. 923 parts of the crystals were obtained with 230 parts being ethanol as a solvent. Therefore, it can be said that centrifugal removal of the mother liquor is not good. The crystals were dried to remove the ethanol and the β-naphthol thus obtained had a purity of 96.1% and contained 1.4% of α-naphthol, 0.3% of isopropylnaphthalene and 0.6% of acetylnaphthalene. The recovery of the β-naphthol obtained as crystals was 77.0%.