Pd(II) extraction from acid solutions by bis-(2-hidroxyl-5-alkylbenzyl)amine

Abstract

It is known that a series of organic compounds contained in the molecule SH, NH qroups have the ability to form the intracomplex compounds under certain conditions. These compounds allow to carry out the extraction in acidic medium and therefore prevent the hydrolysis process. They are not dissolved in water but are soluble in various solvents and form colored solutions and so may be used in extraction chemistry. The main purpose of this paper was to study the ability to extract palladium by bis-(2-hidroxyl-5-alkylbenzyl)amine, synthesized in the laboratory on the basis of industrial alkylphenols. Ammonium acetate with various pH was used as a buffer to extract palladium from PdCl2·2H2O 0.1 mkg/ml solution. The main task for the use of inert organic compound in extraction is the selection of a reagent which dissolves it but does not form any compound. For this purpose the influence of different solvents on this reagent was researched. The experiments show that bis- (2-hidroxyl-5-alkylbenzyl)amine is dissolved well in organic solvents. Its solution, for example in kerosene, is light-resistant, does not hydrolyze in water, alkalis and acids. Thus bis-(2-hidroxyl-5-alkylbenzyl)amine may be recomended for palladium extraction.