PARA-TERTBUTYLBENZOIC ACID "N', N'-DIALKYLHYDRAZIDES Russian patent published in 2012 - IPC C22B15/00 C22B3/26 

FIELD: chemistry.

SUBSTANCE: invention relates to novel compounds of the N',N'-dialkylhydrazide class and can be used in copper hydrometallurgy. Para-tertbutylbenzoic acid N',N'-dialkylhydrazides of general formula tertC₄H₉C₆H₄CONHN(R)₂ are obtained, where R is an aliphatic radical C_nH_2n+1 n=1-10. The compounds, preferably with number of carbon atoms per radical (n) from 6 to 10, are used as an extraction agent for copper (II) from ammonia solutions. Degree of extraction of copper (II) from solutions with ammonia content of up to 8 mol/l is equal to 96.5-99.4%.

EFFECT: compounds have high solubility in aliphatic hydrocarbon solvents.

2 cl, 3 tbl, 5 ex