Vapor-liquid equilibriums data for helium-carbon monoxide and helium-nitrous oxide systems

Cryogenic systems containing helium have been of practical interest for applications ranging from separation processes to pressurized systems. However, few data exist in the literature for helium systems containing carbon monoxide or nitrous oxide. Sinor and Kurata (7) determined liquid-phase compositions of helium-carbon monoxide mixtures at four temperatures between 77 and 128K and at pressures up to 138 bars. Kling (5) made an extensive experimental study of nitrous oxide systems including the helium-nitrous oxide system; however, his data are presented in graphical form only, and the internal consistency of the data could not be assessed. The work reported here was performed to provide a more complete set of phase equilibrium data for these two binary systems.