| 摘要 |
PURPOSE:To obtain the titled substance inexpensively and simply, by reacting propionic acid with methylal in a gaseous phase by the use of a calcined solid phosphate catalyst and bringing a formed mixture to a silica catalyst containing an alkali metal of group I of the periodic table immediately. CONSTITUTION:Propionic acid is reacted with methylal in a gaseous phase by the use of a solid phosphate catalyst calcined at high temperature of 500-1,000 deg.C and a formed gas containing formaldehyde, methanol and methyl propionate is immediately brought into contact with an alkali metal of Group I of the periodic table to give the titled substance. The solid phosphate catalyst, for example, is prepared by a method wherein a solution obtained by diluting 85% phosphoric acid sold on the market in water is sprayed upon a carrier (e.g. silica gel of alumina) and preferably previously calcining the carrier at <=300 deg.C before high-temperature calcination is carried out. The catalyst of the second stage is preferably that obtained by supporting an alkali metallic compound on a porous amorphous silica. |
