| 摘要 |
PURPOSE:To obtain a benzaldehyde continuously in a very short time, by hydrolyzing a benzal chloride which may be substituted by a halogen or CF3, in the vapor phase in the presence of an inexpensive active carbon treated with an acid as a catalyst. CONSTITUTION:A benzal chloride expressed by formulaI(X is halogen or CF3; n is 0, 1 or 2) in the vapor phase is hydrolyzed in the presence of active carbon treated with an acid, e.g. sulfuric acid, as a catalyst to prepare a benzaldehyde expressed by formula II. The catalyst is capable of advancing the hydrolysis in a very short time even in the case of the benzal chloride having a strong electron attractive group, e.g. CF3, as a raw material , and the activity thereof is not deteriorated by hydrogen fluoride generated by the hydrolysis of part of the CF3. Thus, the activity can be maintained for a long time. |
