PUBIFICATION OF WET PROCESS PHOSPHOHIC ACID BY SOLVENT EXTRACTION WITH DIBUTYL ETHER. PART. I. LIQUID-LIQUID EQUILIBRIUM OF THE SYSTEM WATER-PHOSPHORIC ACID-DIBUTYL ETHER AT 25°C.

Solubility and liquid-liquid phase equilibrium data have been determinated for the ternary system water-Phosphoric Acid-Dibutyl Ether at 25°

Data for the binodal curve have been obtained by analyzing the phosphoric acid percentage in both aqueous and organic phases. The plait point composition has been calculated by the Hand, Coolidge and Sherwood methods. The phosphoric acid extraction capacity of dibutyl ether has been compared to that of several solvents previously studied in the Alicante Chemical Engineering Division, showing that dibutyl ether has a phosphoric acid extraction capacity similar to propyl-ether and lower than isoamyl alcohol.     

PURIFICATION OF WET PROCESS PHOSPHORIC ACID BY SOLVENT EXTRACTION WITH DIBUTYL ETHER. PART II. STUDY OF THE IMPURITIES DISTRIBUTION

The results obtained when studying the purification of wet process phosphoric acid wdith dibutyl ether are reported. Percent PA, and impurities: Fe, Al, Mg SO₄ ^? and F^? extracted into the organic phase are shown. The variation of the percent extracted in to the organic phase for the different components has been studied as a function of the PA wt% in the organic phase. Results have been compared with those corresponding to other solvents previously studied. Dibutyl ether shows good purification behaviour for metallic impurities and SO₄ ^?, but seems to be not very suitable for F^? purification due to its high F^? extraction capacity.