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1 PGE 427 - Properties of Petroleum Fluids - Spring 2020 Problem Set 6 Assignment Date: March 9, 2020 Due Date: March 27April 3, 2020 by 1:00 PM 1.(25 points) Make a Px diagram for the C2/nC5binary at 300 K using PVTsim with the PR EOS. a.(6 points) Draw at least 3 tie lines within the two-phase region. b.(4 points) Indicate saturation (vapor) pressures for 100% C2and 100% nC5on the diagram. c.(4 points) Also indicate the dew-point curve and bubble-point curve. d.(5 points) Is there any critical point in this diagram? Why, or why not? e.(6 points) What will be the bubble point and the dew point for a mixture of 80 mol% C2and 20 mol% nC5at 300 K, on the basis of the diagram created? For this last question, perform a saturation pressure calculation with PVTsim. No critical point is present in this diagram because the temperature, 300 K, is lower than the critical temperatures of the two components (422.05 K and 462.71 K). 010002000300040005000020406080100Pressure, kPaC2mole percentBubble-point curveDew-point curveVapor pressure of nC5Vapor pressure of C2
2 2.(40 points) [PVTsim] This is a question regarding phase envelope and equilibrium concept. a. (10 points) Using PVTsim with the PR EOS, show the following on the same P-T figure: -PT cross section for the equimolar mixture of C2and nC5-Vapor pressure curve of C2-Vapor pressure curve of nC5. Indicate the critical point of the equimolar mixture clearly. b.