Abstract
Research was conducted to find molten salt mixtures, compatible with alkali metal sulfates, as media for ammonium hydrogen sulfate reactions. Mixtures of mono- and divalent metal sulfates having freezing temperatures of ∼ 550 K were sought, pure sulfates melt at 1000 to 1300 K. Nine divalent metal sulfates with three alkali metal sulfates were used.For interpretation of experimental data a thermodynamic model was developed, the key parameter being the entropy-enthalpy function, positive values of the excess function produce greatest effect. Results gave for 4-comppnents 640 K; for 5-components 631 K; for 6-components 596 K; and 7-components 593 K.
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