Liquid−Liquid Equilibria for Aliphatic Alcohols + Dipotassium Oxalate + Water

Abstract

Liquid−liquid equilibria (LLE) in ternary mixtures of water + dipotassium oxalate + alcohol (2-propanol, 1-propanol, 2-methyl-2-propanol, and 2-butanol) have been studied at 298.15 K and atmospheric pressure. The experimental binodal and tie line data were determined at 298.15 K. The binodal curves were correlated using a three-parameter equation, and tie lines were satisfactorily correlated using the Othmer−Tobias, Bancroft, and modified Setschenow equations. The phase separation abilities of the investigated alcohols are in the order of 2-butanol > 2-methyl-2-propanol > 1-propanol > 2-propanol. The effect of temperature on the cloud points as a function of alcohol mole fraction has been studied at temperature range (293.15 to 328.15) K at 5 K intervals. The results show that the lower alcohol concentration is required for phase separation at higher temperatures.

Increased significance of food wastes: Selective recovery of added-value compounds

“…Particularly, for the systems composed of K 2 HPO 4 and K 3 PO 4 , the alcohol with a branched-alkyl chain, 2-propanol, is less effective for undergoing liquid-liquid demixing, when compared with its isomer, 1-propanol. These results are in good agreement with the literature (Greve & Kula, 1991;Ooi et al, 2009;Shekaari, Sadeghi, & Jafari, 2010;Zafarani-Moattar, Banisaeid, & Beirami, 2005), where ternary systems based in the same alcohols and organic citrate salts (sodium-and potassium-based) were used. This trend can be explained by the higher hydrophobicity of 1-propanol.…”

Phase separation in aqueous solutions of polypropylene glycol and sodium citrate: Effects of temperature and pH

“…Recently, the above equations have been successfully used for the correlation of binodal data of some aqueous ionic liquid-based ABS [24][25][26][27], polymer-based ABS [28,29] and hydrophilic alcohol-based ABS [30,31]. The fitting parameters obtained from the correlation of the experimental binodal data given in Tables 2S and 3S along with the corresponding absolute average deviations (AAD) are collected in Tables 2 and 3, respectively.…”

Liquid–liquid equilibrium of 1-propanol, 2-propanol, 2-methyl-2-propanol or 2-butanol+sodium sulfite+water aqueous two phase systems

“…Different versions of the Setschenow-type equations were used in this regard by some authors to assess the salting-out effect of an electrolyte on non-electrolyte in different ATPSs. In this regard, we attempt to analyze our studied systems and compare the results with the recommended literature data, using two Setschenow-type equations introduced previously [28,30]. One of the latest versions of the Setschenow-type equations which is frequently used to study the salting-out of different salts in different ATPSs is as follows [30]: …”

“…The obtained LLE data in this work along with the ones reported previously for some other alcohol + water + salt systems [26][27][28][29] were fitted to Eqs. (2) and (3) to find a relation between the saltingout ability and k ca coefficient, and are reported in Tables 6 and 7, respectively.…”

“…Also, to study the effect of temperature on the phase separation ability of the studied systems the cloud point data as a function of alcohol mole fractions at T = 293.15-323.15 K with 5 K intervals was measured. Also, the use of the Setschenow-type equations to study the slating-out effect of the mentioned ATPSs along with some previously studied alcohol + salt + water systems [26][27][28][29][30][31][32][33] was discussed. Moreover, the modified segment based Wilson equation [23] was generalized to represent the mixed solvent electrolyte systems and the performance of this model in the correlation of the studied ATPSs was examined.…”