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In this study, solid-liquid equilibria of dicarboxylic acids for binary mixtures, hexanedioic acid (1) + octanedioic acid (2) (eutectic temperature T E = 390.54 K, eutectic composition x 1E = 0.419); hexanedioic acid (1) + nonanedioic acid (2) (T E = 372.52 K, x 1E = 0.269); hexanedioic acid (1) + decanedioic acid (2) (T E = 387.43 K, x 1E = 0.514); heptanedioic acid (1) + octanedioic acid (2) (T E = 365.81 K, x 1E = 0.782); heptanedioic acid (1) + nonanedioic acid (2) (T E = 352.50 K, x 1E = 0.558); heptanedioic acid (1) + decanedioic acid (2) (T E = 367.07 K, x 1E = 0.753); octanedioic acid (1) + decanedioic acid (2) (T E = 387.97 K, x 1E = 0.465); nonanedioic acid (1) + octanedioic acid (2) (T E = 367.62 K, x 1E = 0.712); and nonanedioic acid (1) + decanedioic acid (2) (T E = 370.49 K, x 1E = 0.687), are measured using differential scanning calorimetry and correlated using Clarke-Glew equation. An observation here is simple eutectic phase diagrams for these systems. It can be noted that experiment results, correlated with Wilson and nonrandom two-liquid activity coefficient models, are highly satisfactory. [ABSTRACT FROM AUTHOR]

This research focuses on measuring the solubility of three antioxidants--ethylenediaminetetraacetic acid disodium salt hydrate, ethylenediaminetetraacetic acid calcium disodium salt hydrate, and L-cysteine hydrochloride--in supercritical carbon dioxide. Using a semiflow apparatus, the experiment takes data at 308.15, 313.15, and 318.15 K with pressure ranging from 10 to 22 MPa (for ethylenediaminetetraacetic acid disodium salt dihydrate) or from 12 to 24 MPa (for ethylenediaminetetraacetic acid calcium disodium salt hydrate and L-cysteine hydrochloride). Two semiempirical equations--one proposed by Chrastil, the other Mendez-Santiago and Teja--are applied to find the correlated relationship of the experimental data. With the choice of fitted parameters, the correlation derived from the two equations are satisfactory: the average absolute relative deviation is under 5.1%. [ABSTRACT FROM AUTHOR]

In this research, the solubility of sodium l-ascorbate and that of sodium erythorbate monohydrate, both being antioxidants, in supercritical carbon dioxide are measured. Using semiflow type equipment, this experiment gathers the data of solubility for antioxidnats at (308.15, 313.15, and 318.15) K, over a range of pressures from (12 to 24) MPa. The data gleaned from the experiment are forward numerically processed, with the use of the semiempirical equations presented by Chrastil and by Mendez-Santiago and Teja, to make clear the correlation among various characteristics. The final results are satisfactory: when parameters with optimal fitting are picked to examine the correlation, the average absolute relative deviation (AARD) is under 4%. [ABSTRACT FROM AUTHOR]

Solid−liquid equilibria for three organic binary mixtures of hexanedioic acid (1) + benzoic acid (2) (eutectic temperature TE= 378.17 K, eutectic composition x1E= 0.249), benzoic acid (1) + pentanedioic acid (2) (TE= 343.50 K, x1E= 0.402), and hexanedioic acid (1) + pentanedioic acid (2) (TE= 355.87 K, x1E= 0.205) were measured using differential scanning calorimetry (DSC). Simple eutectic behaviors for these systems were observed. The experimental results were correlated using the Wilson and nonrandom two-liquid (NRTL) activity coefficient models with satisfactory results. [ABSTRACT FROM AUTHOR]