METHOD AND INSTALLATION FOR THE MANUFACTURE OF DIACETONITRILE Russian patent published in 2022 - IPC C07C253/00 C07C255/30 C07C255/61 

FIELD: chemical industry.

SUBSTANCE: invention relates to the field of chemical industry, namely to a method for producing technical diacetonitrile. The proposed method involves feeding a suspension of crushed potassium tert-butoxide in dry acetonitrile to the reactor in a ratio of 200 g of potassium tert-butoxide per 1 liter of acetonitrile and heating the reaction mixture in the reactor to 60°C with ultrasonic irradiation at a frequency of 35 kHz to mix the reaction mixture and mass transfer in a heterogeneous system of potassium tert-butoxide-acetonitrile until the end of the reaction. At the same time, the methane formed during the reaction is removed, and then the reacted reaction mixture is pumped from the reactor to the receiver, in which, after cooling to room temperature, it is neutralized with 10% hydrochloric acid to pH =2. The diacetonitrile obtained in the form of light yellow oil is washed with cold water at a temperature of 4-5°C to a neutral reaction and left to stand under a layer of cold water at a temperature of 4-5°C for 10 hours, after which it is separated by filtration with a nutsche filter. The invention also relates to an installation for the production of technical diacetonitrile by the specified method.

EFFECT: proposed method makes it possible to obtain technical diacetonitrile with a purity of 88% in industrial conditions without the use of flammable liquids, high temperatures and aggressive media.

2 cl, 2 dwg, 1 ex