PROCESS FOR PREPARING BENZAMIDE Russian patent published in 1994 - IPC

FIELD: chemical industry. SUBSTANCE: the product is benzamide. Reagent 1: benzoic acid methyl ester prepared by reacting benzoic acid with CH₃OH in the presence of a strong cationite in H⁺-form, the reaction mixture is then kept till the equilibrium of the esterification-hydrolysis reaction is established on heating, followed by cooling and separation of the cationite. Reagent 2: a 25% aqueous solution. Reaction conditions: NH₃ is added to the resultant reaction mixture and the process is carried out in a homogeneous medium at a benzoic acid to CH₃OH to cationite to NH₃ weight ratio of 1: (5-10): (0.5-1):(4.7-7), followed by removal of NH₃ and CH₃OH from the reaction mixture and distillation of the unreacted benzoic acid methyl ester. EFFECT: improved properties of the title product. 3 cl, 1 tbl