| 摘要 |
PURPOSE: Provided is a method of producing 4,4'-biphenol with high efficiency and yield, in which 3,3',5,5'-tetra-t-butyl-4,4'-biphenol is sequentially debutylated under relatively mild reaction conditions using reaction bathes arranged in series for two or more steps. CONSTITUTION: The method for producing 4,4'-biphenol comprises the steps of preparing serially arranged reaction bathes for two or more steps; and carrying out a debutylation reaction of 3,3',5,5'-tetra-t-butyl-4,4'-biphenol sequentially in the presence of an acid catalyst in a reaction solvent by supplying at least one kind of phenols selected from the group consisting of phenol, monoalkylphenols, dialkylphenols, and trialkylphenols, in a proportion of at least 0.5 mole part relative to one mole part of 3,3',5,5'-tetra-t-butyl-4,4'-biphenol, to each reaction bath as a solvent for addition, wherein the number of carbon atoms of alkyl groups in alkylphenols consisting of the monoalkylphenols, the dialkylphenols, and the trialkylphenols, is each independently in the range of 1 to 4, and wherein a solvent for addition to a reaction bath (2) for the latter step is at least one kind of the phenols having a smaller average number of alkyl groups than phenols used as a solvent for addition to a reaction bath (1) for the former step.
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