Abstract

Recovery of Palladium from Concentrated Nitrate Solutions with N,N′‐Dimethyl‐N,N′‐Dioctyltetradecylmalonamide as new Extractant

Emad A. Mowafy^1,2 and D. Mohamed¹

DOI : http://dx.doi.org/10.13005/ojc/330530

Abstract:

The new unsymmetrical malonamide namely; N,N′‐dimethyl‐N,N′‐ dioctyltetradecyl-malonamide (DMDOTDMA) was prepared and evaluated as agent for the extraction and separation of Pd(II) from nitrate media was studied. N,N′‐dimethyl‐N,N′‐dioctylmalonamide (DMDOMA) was synthesized and used for comparison purpose. The effect of various parameters had been studied in details to explain the extraction properties of pd(II) by using DMDOTDMA in mixed diluents (75 vol.% n-dodecane-25 vol.% n-octanol) from nitrate media. The extraction equilibrium of Pd(II) with the investigated maloamides was reached within 10 minutes. Pd(II) showed remarkable extractability by DMDOTDMA and the maximum extraction percentage of Pd(II) is nearly reached at ~ 5 M HNO₃. Under similar extraction conditions Zn(II),Ni(II), Mn(II) Cu(II) and Pb(II) were found poorly extracted. The dominate extracted species of Pd(II) is Pd(NO₃)₂(MA)₂.The separation of Pd(II) from other studied metal ions was found to be effective in the range of nitric acid solution used. The stripping of Pd(II) was successfully carried out by single contact with 0.1M thiourea solution.

Keywords:

Novel Extractant; Palladium; Base Metal Ions; Extraction/Separation; Nitric Acid

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