| 摘要 |
PURPOSE:To produce the title substance by carrying out reaction in a reactor in the first stage in a stirred state and reducing the residence time of a reaction solution to a short time in successively reacting phenol with a formaldehyde source and oxalic acid as a catalyst in a multistage type reactor. CONSTITUTION:Phenol is successively reacted with a formaldehyde source and oxalic acid in a multistage type reactor to produce the title substance. In the process, the reaction in a reactor in the first stage is carried out in a stirred state for <=40min (preferably <=10min) to simply afford the objective high-purity substance excellent in hue, according to a method suitable for mass production. Although reactors in the second stage or thereafter may be provided with stirrers, a reaction vessel with rotating stirring blades, a pump circulating type reaction vessel, etc., are preferably used as the reactor in the first stage. The residence time in the whole multistage type reactor is within the range of 1 to 3hr and the reaction temperature is 60-90 deg.C. |
