Abstract
Extraction of water by tri- n-octyl phosphine oxide (TOPO) dissolved in o-xylene, in the concentration range 0·01–0·30M has been studied at 20±0·1°C and at 40±0·2°C. The equilibrium concentration of water in the organic phase was determined by the Karl Fischer method. TOPO solutions in o-xylene, investigated at 25°C and 37°C osmometrically were found to behave close to ideality in the entire range of concentrations investigated. Equilibrium analysis of the Karl Fischer data indicated the presence of the species (TOPO) q ·(H 2O) p in equilibrium with a monomer, TOPO·H 2O, present in the organic phase. At 20°C, best fit was obtained with the complexes TOPO·H 2O, ( K 11 = 1·80M −1), log K 11 = 0·26) and (TOPO) 3·(H 2O) 4( K 34 = 25·42M −3 log K 34 = 1·41) while at 40°C the data showed the presence of TOPO·H 2O ( K 11 = 2·00M −1, log K 11 = 0·30) and (TOPO) 2·(H 2O) 3, ( K 23 = 0·84M −2, log K 23 = −0·08). I.R. spectra of the system equilibrated at 20±0·1°C gave evidence for the multiple hydrogen-bonding of various hydroxyl groups. Spectral changes appeared near the same TOPO concentration range as expected from the interpretation of the Karl Fischer data.
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