| 摘要 |
PROBLEM TO BE SOLVED: To produce diphenyl carbonate of sufficient color phase without development of hydrogen chloride by making phenol with phosgene by using a pyridine compound as a catalyst under specifically controlled conditions, including concentration of the catalyst to the phenol, reaction temperature and reagent composition. SOLUTION: This diphenyl carbonate is produced by reacting 1mol of phenol with 0.5mol or less phosgene at a phenol conversion ratio of 90% by the use of a pyridine compound of formula I (R is H, methyl or methoxy) as a catalyst. The reaction is carried out under the conditions that [C] is 1.2-10mol%, [T] 138-165 deg.C, [X] 1.5-8, where [C]: concentration of the catalyst to phenol (mol%), [T]: reaction temperature ( deg.C), [X]: mol ratio of phenol to phenyl chloroformate present in the reaction system at the end of reaction, and [Y]: mol ratio of phosgene used for the reaction with phenol, and also under conditions that satisfy formulae II and III (A is a constant expressed by formula III; B is a constant expressed by formula IV), thus obtaining the objective compound at a high yield. |
