| 摘要 |
A process for production of 4,4'-biphenol, characterized by comprising the following steps (a) and (b): the step (a) of dealkylating an alkyl-4,4'-biphenol represented by the general formula (2) in the presence of a phenol selected from the group consisting of phenol, monoalkylphenols, dialkylphenols and trialkylphenols wherein the dealkylation is either conducted under a reduced pressure or continued under atmospheric pressure until the amount of formed monoalkyl -4,4'-biphenol decreases to 5 to 20 parts by weight per 100 parts by weight of 4,4'-biphenol, and the step (b) of precipitating 4,4'-biphenol from the reaction fluid obtained in the step (a) and separating it. (2) [In the general formula, T is alkyl having 3 to 8 carbon atoms; and m and n are each 0, 1, or 2, the sum of m and n ranging from 1 to 4.]
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