EXTRACTION OF SELECTED METAL CATIONS WITH THE ALKYLARYLPHOSPHINIC ACID: 2, 4, 4-TRIMETHYLPENTYLPHENYLPHOSPHINIC ACID

摘要

The synthesis and physical properties of 2,4,4-trimethylpentylphenylphosphinic acid (TMPPPA) is described. Extraction of several metals, mostly from the first row transition elements, was examined and compared to that of other phosphinic acids. As a function of increasing pH the metals studied were found to extract in the order: Fe < Zn < Al < Mn, Ca, Cu < Co < Mg < Ni The metals Mn(II), Ca(II), and Cu(II) were observed to have very similar pH extraction profiles. Compared to bis(2,4,4-trimethylpentyl)phosphinic acid - the main component of CYANEX~(~R) 272 - the extraction order was similar, with the exception of Ca(II), which was observed to extract in preference to Co(II) and Mg(II). For all the metals studied extraction was observed at lower pH for TMPPPA by 1.1 to 1.6 pH units compared to CYANEX 272.