METHOD OF DETERMINING COMPOSITION OF NONVARIANT EQUILIBRIUM PHASES OF MULTI-COMPONENT WATER-SALT SYSTEMS Russian patent published in 2011 - IPC G01N33/18 G01N31/00 

FIELD: chemistry.

SUBSTANCE: method involves predicting composition of a nonvariant solution, experimental determination of compositions of mixtures on boundaries of the nonvariant region and nonvariant liquid phases with optimum initial mixtures of components, lying in a strictly defined order, from measurements of the physical property of the liquid phase after establishing equilibrium using the "composition-property" functional relationship. Further, for all experimental points lying arbitrarily on all boundaries of the nonvariant region, based on the average ratios of content of the component which is absent in compositions of equilibrium solid phases on corresponding planes or extreme nodes of the nonvariant region of the system to content of water, the composition of the nonvariant liquid phase is calculated and equilibrium solid phases are determined using true coordinates.

EFFECT: obtaining accurate data on phase equilibria in a system without using chemical analysis methods, considerable increase in accuracy mathematical prediction of the composition of the nonvariant solution, avoiding loss of accuracy and reliability of determining composition of the nonvariant solution with increase in the number of components in systems of any type.

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