04) Petroleum Fluids 9607 - Petroleum Fluids 9/6 PT...

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Petroleum Fluids 9/6
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PT Diagrams Single component PT diagram 2 component PT diagram
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Differences Single line for vapor pressure curve vs. broad region where two phases coexist One side of the two-phase region is the bubble-point line, one side is the dew- point line Two lines join at the critical point Percentage of liquid and gas found inside this two-phase region
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Critical point Single component: Critical point: Upper limit of the vapor-pressure line (T c : critical temperature, and p c : critical pressure, are the coordinates of the critical point). Above critical temperature gas cannot be liquefied, above critical pressure, gas and liquid cannot coexist Mixture: Point at which all properties of the liquid and gas become identical Critical pressure of a two component mixture usually higher than the critical pressure of either component
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Cricondentherm – highest temperature on the saturation envelope Cricondenbar – highest pressure on the saturation envelope C a and C b are the individual components vapor pressure lines Ex 2-3 – 2-4
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04) Petroleum Fluids 9607 - Petroleum Fluids 9/6 PT...

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