FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for synthesis of aminomethyleneamides (Mannich bases), in particular, to synthesis of N,N'-bis-(dimethylaminomethyl)urea representing an intermediate compound used in modification of polyacrylamide and conferring to its high flocculation properties. Method is carried out by interaction of dimethylamine, formaldehyde and urea for two steps. On the first step dimethylamine aqueous solution is mixed with formaldehyde or paraform solution in the mole ratio 1:1, at temperature (+5)-(+40°C) followed by holding for 30 min. On the second step urea solution is added to prepared solution of N,N-dimethtylaminomethanol in the mole ratio urea : dimethylamine = 1:2 and held at temperature (+5)-(+50°C). Invention provides improving technology, enhancing yield and purity of the end product.
EFFECT: improved method of synthesis.
4 cl, 4 ex
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