Experimental determination of the phase diagrams of the Co-Ni-X (X = W, Mo, Nb, Ta) ternary systems using diffusion multiples

An approach to the determination of free variables required for calculating the material balance of the flowsheet of ternary mixtures separation is presented. Phase diagrams of the considered ternary systems are characterized by the presence of a two-phase splitting area and by the presence of different amounts of azeotropes (classes 3.1.0, 3.1.1, 3.2.1 and 3.3.1). For all the systems flowsheets containing three rectification columns and a florentine vessel for separation were suggested. The multivariance of the solution of the balance problem was shown. The approach was illustrated by the example of real ternary systems characterized by different phase diagrams (methanol - chloroform - water, butyl alcohol - water - toluene, nitromethane - hexane - water). The parameters of the rectification columns were presented.

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Experimental Determination of Thermodynamic Quantities and Phase Diagrams

CALPHAD: Calculation of Phase Diagrams - A Comprehensive Guide - Pergamon Materials Series ◽

10.1016/s1470-1804(98)80024-2 ◽

1998 ◽

pp. 61-87

Keyword(s):

Experimental Determination ◽

Phase Diagrams ◽

Thermodynamic Quantities

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Theoretical Prediction and Experimental Determination of Vapour-Liquid Equilibrium for Ternary Systems Trimethyl Borate-Methanol-N,N-Dimethylformamide/N,N-Dimethylacetamide

Asian Journal of Chemistry ◽

10.14233/ajchem.2015.18272 ◽

2015 ◽

Vol 27 (8) ◽

pp. 2883-2886

Author(s):

Zhenyu Bao ◽

Weijiang Zhang ◽

Xianbao Cui ◽

Jiao Xu

Keyword(s):

Theoretical Prediction ◽

Experimental Determination ◽

Ternary Systems ◽

Trimethyl Borate ◽

Liquid Equilibrium

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Experimental determination of activity interaction coefficients of components in Si-B-Fe and Si-B-Al ternary systems at 1723 K

Journal of Mining and Metallurgy Section B Metallurgy ◽

10.2298/jmmb190731006y ◽

2020 ◽

Vol 56 (2) ◽

pp. 153-160

Author(s):

F. Yang ◽

Y.-Q. Zhou ◽

J.-J. Wu ◽

W.-H. Ma ◽

Y. Lei

Keyword(s):

Experimental Determination ◽

Ternary Systems ◽

Interaction Coefficient ◽

Boron Removal ◽

Interaction Coefficients ◽

Concentration Method ◽

Equilibrium Concentrations ◽

Silicon Materials ◽

Determination Of Activity

The interactions among impurity components in Si-based solution are the important thermodynamic parameters for the purification of silicon materials. A ?same concentration? method was used to determine the activity interaction coefficients of Fe to B and Al to B in the silicon solution. Fe and Al were respectively dissolved into the binary Si-B solution at 1723 K with the holding time of 5 h, 7 h, 9 h, and 11 h. The equilibrium concentrations of Fe, B in the Si-B-Fe system and Al, B in the Si-B-Al system were determined. The interaction coefficients of Fe to B and Al to B were obtained by fitting the solubility data of B, Fe, and Al. The solubility relationships between B and [%Fe], and between B and [%Al] were obtained, respectively. It was found by the SEM and EPMA pictures of the samples that the third component Fe or Al added to the binary Si-B solution was alloyed, which verifies the accuracy of the experimental determination results. The significance of the activity interaction coefficient of B on boron removal from industrial silicon was analyzed.

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