| 摘要 |
<p>A method for producing 4,4'-biphenol, comprising the steps of: providing serially arranged reaction baths 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 phenol 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 the alkyl groups in the alkylphenols selected from the group consisting of the monoalkylphenols, dialkylphenols, and trialkylphenols, is each independently in the range of 1 to 4, and wherein a solvent for addition to a reaction bath for the latter step has a smaller average number of alkyl groups than a solvent for addition to a reaction bath for the former step.</p> |
