Study On Phase Equilibria Of Binary Systems Containing Carbon Monoxide

A set of variable-volume autoclave with a quartz window has been made domestically for the first time. The accurate volume of a sample can be measured with a Hall-effect probe, and the precise adjustment within wide range of temperatures and pressures can be actualized. At high pressure, the samples can be taken directly from the autoclave with a small steel vessel. So the accurate vapor-liquid equilibrium data can be obtained. The experiment equipment was proved to be reliable and accurate comparing with literature data. A simple equipment was also built up for the analysis the composition of the vapor and liquid samples. The vapor-liquid equilibrium data (including ingredient, density and molar volume) of the four binary systems (carbon monoxide + Ethanol, carbon monoxide + diethyl carbonate, carbon monoxide + ethyl acetate and carbon monoxide + methyl acetate) have been measured at different temperatures and pressures with isothermal static analytical method.The vapor-liquid equilibrium data show that the solubilities of carbon monoxide in the four liquids increase with increasing pressures at the given temperatures, and the contents of four liquids in carbon monoxide al??ncrease with increasing pressures at the given temperatures. While the solubilities of carbon monoxide in the four liquids decrease drastically with increasing temperatures at the given pressures, but the contents of four liquids in carbon monoxide increase faintly.The high-pressure gas-liquid equilibria are also calculated with six methods for above four systems. The PR and PRSV equations of state and four different mixing rules are used. The Suitability of those equations of state and calculated precision are discussed systemically. The method combining PRSV equation of state with van der waals-2 mixing rule giving an excellent results.