METHOD OF OBTAINING ALKYYDDIMETHYLAMINES Russian patent published in 2017 - IPC C07C209/16 C07C211/08 

FIELD: chemistry.

SUBSTANCE: method consists in carrying out catalytic amination of higher alcohols selected from 1-dodecanol or 1-octadecanol, dimethylamine in the presence of a copper chromium catalyst additionally containing nickel and alumina and hydrogen in the reactor. In this case, a hydrogenation catalyst prepared from an aqueous solution of nickel nitrate with the addition of alumina, copper carbonate and chromium oxide is placed in the reactor to obtain a mixture which is dried overnight at 100°C, calcine at 400°C for 4 hours and activated in a stream of hydrogen 200 cm³/min for 2 hours, and 100 grams of higher alcohols selected from 1-dodecanol or 1-octadecanol. The resulting reaction mixture is purged with nitrogen and bubbled with hydrogen in a liquid phase at a current of 50 cm³/min, then mixed, heat up to 200°C. Then, together with hydrogen, dimethylamine is supplied with a current of 200 cm³/min, the reaction is continued for 4 hours at 200°C. After that, the bubbling is stopped, the resulting reaction product is cooled to 40°C and filtered through a glass filter with pores of 20 mcm, and the outlet gas during the reaction is passed through a condenser to remove water and dimethylamine. Preferably, the hydrogenation catalyst is an aqueous solution of nickel nitrate prepared from 9.9 g of hexahydrate of nickel nitrate in 15 grams of distilled water to which 10 grams of alumina, 2 grams of copper (II) carbonate and 1 g of chromium (III) oxide, the resulting mixture was dried overnight at 100°C and calcined at 400°C for 4 hours.

EFFECT: high yield of the product with a small amount of unreacted substances and by-products.

2 cl, 1 tbl, 2 ex