Colorless leaf crystals. The melting point is 114.8 ° C, the boiling point of 216 ° C, the relative density of 0.8850 (120 / 4 ° C), the refractive index of 1.4087 (130 ° C), soluble in water and alcohol, slightly soluble in ether.
It is obtained by amination of n-butyric acid. The n-butyric acid is heated and reacted with ammonia. After about 40 hours, the temperature of the reaction solution reaches 200-215 ° C, the heating is stopped and ammonia is passed, the mixture is cooled to below 20 ° C, and filtered to obtain butanamide. Another method is to react with n-butyric acid and urea: firstly, 8 kg of n-butyric acid and 3 kg of urea are heated to reflux for 10 h, and then cooled to 70-80 ° C, poured into an appropriate amount of hot ethanol, decolorized, filtered, cooled, and filtered. The crude product was recrystallized from ethanol to give a finished product.
Colorless crystal powder
216°C at 760 mmHg
Cool,dry and hermetic place