Effect of long-chain amines on the extraction of boron from CaCl2 brine with CTMP in petroleum benzine

The effect of TOA (tri-n-octylamine), TOMA (tri-n-octylmethylammonium iodid e), DEDA (N,N'-didodecylethylenediamine), DEDMA (N,N'-didodecyl-N,N'-tetram ethylethylene-diammonium diiodide), and NDM (N-dodecylmorpholine) upon the solvent extraction of boron from CaCl2 brine with CTMP [2-chloro-4(1,1,3,3, -tetramethylbutyl)-6-methylolphenol] in petroleum benzine has been studied. In order to extract boron effectively and reject other cations such as Ca2 +, the extraction of boron with CTMP was investigated in terms of extractan t, the concentration of an amine, and solvent polarity. The results show th at in the presence of long-chain amines, boron extraction with CTMP in all solvent systems was shifted To a more acidic pH range. Larger extraction, h ence distribution, and an increase in selectivity are observed when CTMP is used together with long-chain amines and their ammonium salts in petroleum benzine.