Composition Shift due to the Different Solubility in the Lubricant Oil for Multicomponent Mixtures
نویسندگان
چکیده
The composition shifts of multicomponent mixtures used in low temperature Joule-Thomson refrigerators due to the different solubility in lubricant oils are studied in this paper. A compound of squalane with a high-boiling point temperature is treated as a kind of mineral oil. The Peng-Robinson (PR) equation of state (EOS) is selected to predict the solubilities, in which a group contribution model is used to predict the interact coefficients. The Gas-Liquid equilibria for the squalane and multicomponent mixtures is studied to determine the influence of the solubility on the composition shift. The results show that the dissolution in oil will greatly decrease the concentrations of those components with high-boiling point temperatures. The composition variation can reach about -74% for the highest-boiling component, and about 160% for the lowest-boiling component. Influences of the composition shifts on the thermodynamic performances is also studied.
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