| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for industrially producing high-purity 1,1-bis(4-hydroxyphenyl)cyclohexanes containing little metallic impurity in good production efficiency. SOLUTION: A primarily crystallized and filtered product is obtained by reacting cyclohexanone with phenols represented by general formula (I) (wherein, R is a hydrogen atom or an alkyl group) in the presence of an acid catalyst, neutralizing the obtained reaction mixture with an alkali, primarily crystallizing the formed 1,1-bis(4-hydroxyphenyl)cyclohexanes, and filtering the crystallized product. A solution is obtained by dissolving 100 pts.wt. of the primarily crystallized and filtered product in 200-400 pts.wt. of a mixed solvent comprising 5-10 pts.wt. of water and 100-200 pts.wt. of a lower aliphatic ketone solvent, or a lower aliphatic alcohol solvent. The high-purity 1,1-bis(4-hydroxyphenyl)cyclohexanes represented by general formula (II) (wherein, R is the same as the above) is obtained by filtering the solution with a zeta potential filter, secondarily crystallizing the 1,1-bis(4-hydroxyphenyl)cyclohexanes from the filtrate in the presence of the water, and filtering the crystallized product. COPYRIGHT: (C)2005,JPO&NCIPI
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