Gas-liquid phase equilibrium below 0Uc in the system NH3N2H2 and in the system NH3Kr

Abstract

In a previous publication 1) an instrument has been described for studying the gas-liquid phase equilibrium of a two- or multicomponent system. For testing purposes the system NH3N2H2 had been used, which, as a first approximation, is assumed to behave like a binary system. The temperature range covered spread from 0–120°C. The present publication describes the extension of this range to lower temperatures (−14.90°C and −30.96°C). For operation below room temperature it was necessary to make two alterations: first, in the temperature control; secondly, in the analyzing apparatus to meet the difficulties connected with the low concentrations encountered of the gas dissolved in the liquid phase. In addition, as an example of a real two-component mixture, the system NH3Kr has been studied at the temperatures −5.1°C and −20.1°C; the pressure range was limited to 200 atm. and only the composition of the liquid phase was measured. The results for both systems are presented in diagrams, which give the isotherms in the P−x projection.