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Solid-Liquid Equilibria in the Quaternary System NaCl-KCl-NH4Cl-H2O

Farelo F.

Polish Journal of Chemistry

2006

Vol. 80, nr 1

161-172

The mixture parameters of themole-fractionmodel of Pitzer-Simonson-Clegg pertaining to the aqueous salt pair NH4Cl + KCl were obtained by fitting the semi-empirical equations to the solid-liquid distribution data measured for KCl and NH4Cl, at 293, 313 and 333 K, as well as to experimental solubilities of NaCl in the quaternary system NaCl + KCl + NH4Cl + H2O. The fitted parameters and the solid-liquid equilibria (SLE) data were used to estimate the activity coefficients of KCl and NH4Cl in the solid phases, thus allowing the calculation of the eutonic points of the discontinuous series of solid solutions precipitated from aqueous solutions containing both chlorides.

Solubility of n-alkanes in ethyl tert-butyl ether

Domańska U., Venkatesu P.

Polish Journal of Chemistry

1998

Vol. 72, nr 8

1981-1993

The solid-liquid equilibrium (SLE), of 11 binary mixtures of n-alkanes (octadecane, nonadecane, eicosane, heneicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane) in ethyl tert-butyl ether, (ethyl 1,1-dimethylethyl ether, ETBE) have been determined from 275 K to the melting temperature of n-alkane. Results of solubility are compared with values calculated by Wilson, NRTL and UNIQUAC equations utilizing parameters from SLE. The existence of solid-solid first order phase transition in hydrocarbons has been considered in the solubility calculations. The best correlation of the solubility data has been obtained by the NRTL equation, where the average root-mean-square deviation of the solubility temperaures is 0.84 K.

Measurement and correlation of the solubility of crown ethers in selected organic solvents

Domańska U.

Polish Journal of Chemistry

1998

Vol. 72, nr 5

925-939

The solid-liquid equilibrium (SLE), of 13 binary mixtures {18-crown-6(1) + selected organics solvents: benzene, 1-heptene, 1-heptyne, tert-butanol, ethyl mathyl ketone, methyl n-propyl ketone, isobutyl methyl ketone, 1-hexanal, epichlorohydrin, DMSO, 1,1,1-trichloroethane, tetrachloroethylene, 1-chlorobutane (2)} have been determined between 240-315 K. The data have been correlated with three G(E) equations: Wilson, NRTL and UNIQUAC. Moreover published earlier nineteen sets of SLE data for different crown ether: {12-crown-4 or 18-crown-6, or dibenzo-8-crown-6, or dibenzo-24-crown-8(1) + organic solvent (2)} published earlier have been examined, using the same correlation equations. The best cerrelation of the solubility data have been obtained by Wilson's equation, where the root-mean-square deviation of the solubility temperatures varied from 0.44 K to 1,87 K and were dependent on the solute calculated. In the calculations, the existence of solid-solid forst-order phase transition in 18-crown-6 and dibenzo-24-crown-8 have been taken into consideration.