| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to a method of obtaining carboxylic acid amide from aliphatic ketone with 3-5 carbon atoms and hydrocyanic acid. The method includes the following stages: A) interaction of ketone, taken in the molar excess with hydrocyanic acid with obtaining nitrile of the respective hydroxycarboxylic acid, B) hydrolysis of the obtained nitrile of hydrocarboxylic acid in the presence of a manganese dioxide-containing catalyst; C) processing the reaction mixture, obtained after stage B), by distillation. Distillation is realised in two stages: at the first stage the obtained carboxylic acid amide is separated from the mixture, containing water, the said ketone, hydroxycarboxylic acid nitrile and/or hydrocyanic acid, and at the second stage the said mixture is separated with the separation of the said ketone and hydrocyanic acid as the main product, and water as the bottom product, with the mixture, containing ketone, used at stage A), and possessing the lower content of hydrocyanic content than the mixture, taken away in the upper part of the said column, being introduced with reflux into a distillation column, used for the separation of water and hydrocyanic acid.EFFECT: improved method of obtaining carboxylic acid amide, which makes it possible to increase the period of production installation exploitation with the simultaneous increase of the service term of the hydrolysis catalyst.11 cl, 1 dwg, 1 ex |
