SALTING-OUT EFFECT OF SINGLE SALTS Na2SO4 AND NaNO3 ON THE LLE OF THE SYSTEMS (WATER + TOLUENE + ACETONE), (WATER + CYCLOHEXANE + ETHANOL OR 2-PROPANOL) AND (WATER + XYLENE + METHANOL)

The effect of sodium nitrate and sodium sulphate on the distribution of acetone, ethanol, methanol and 2-propanol between toluene, Cyclohexane, xylene and water at 25°C has been experimentally investigated. The McDevit and Long method has been employed to correlate the tie line data. Compared with previous work, the order of decreasing salting out, on a weight basis, is: Na2SO4 > NaCl >KCl > NaNO3      for water + toluene + acetone Na2SO4 > NaCl > NaNO3 > KCl     for water + cyclohexane or xylene+ alcoho

Extraction synergique du cuivre(II) par l'acide di-2-ethylhexyl phosphorique et le TOPO

Ce travail porte sur l'extraction synergique du cuivre(II) en milieu sulfate par l'acide di-2-ethylhexyl phosphorique (D2EHPA) et l'oxyde tri-n-octyl phosphine (TOPO) dans le chloroforme et dans le 1-octanol. L'étude du comportement acido-basique du D2EHPA dans les systèmes chloroforme-eau(Na2SO4) et 1-octanol-eau(Na2SO4) a montré que : pKA 1-octanol <. pKA chloroforme L'étude du comportement acido-basique du mélange (D2EHPA-TOPO) dans le système chloroforme-eau(Na2SO4) a mis en évidence l'interaction entre le D2EHPA et le TOPO. Les complexes extraits dans la phase organique ont pour stoechiométries CuL22HL et CuL2 dans le chloroforme et le 1-octanol respectivement, conformément aux les équilibres d'extraction suivants : Cu2+ +2(HL)2 orgCuL2 2 HL org + 2H+Kex1 0.2 -5,411±=exLogK Cu2+ +2 HLorgCuL2 org +2H+Kex2 0.1 -4,842±=exLogK La présence de l'oxyde tri-n-octyl phosphine dans le système chloroforme-eau (Na2SO4) a montré que l'antagonisme augmente avec la concentration de l'agent synergique. Dans le système 1-octanol-eau(Na2SO4), la présence du TOPO a changé les coefficients stoechiométriques de l'équilibre d'extraction du cuivre(II) par le D2EHPA

ETUDE DU TRANSFERT DE MATIERE MULTI- CONSTITUANT DANS LES PROCEDES DE SEPARATION AVEC TRANSFERT ET REACTION CHIMIQUE

Liquid-liquid equilibrium (LLE) measurements of the solubility (binodal) curves and tie-line end compositions were carried out for the ternary systems (water+ acetic acid + dichloromethane), (water + acetic acid + methyl isobutyl ketone), (water + lactic acid+ methyl isobutyl ketone) (water + acetic acid + iso-amyl alcohol), (water + lactic acid + iso-amyl alcohol), (water + acetic acid + ethyl acetate) and (water + lactic acid + ethyl acetate); and quaternary system (water + acetic acid + lactic acid + iso-amyl alcohol) is studied at constant temperature 20 ±1°C and ambient pressure.. The reliability of the experimental tie-line data was ascertained by means of the Othmer-Tobias and Hand correlations. For the extraction effectiveness of solvents, the distribution and selectivity curves were plotted. In addition, the interaction parameters for the UNIQUAC and NRTL models were retrieved from the obtained experimental results by means of a combination of the homotopy method and the genetic algorithm. In this work Inverse problem optimization-simulation method is applied to estimate the interaction parameters for the reactive system. Finally, these results demonstrate that the optimization procedure proposed is very convenient for estimating the interaction parameters for the proposed systems