Binary Phase Diagrams

About Binary Phase Diagrams

Binary Phase Diagrams generate vapor-liquid equilibrium (VLE) data or vapor-liquid-liquid equilibrium (VLLE) data for a given pair of components. They help you visualize, analyze, and validate the binary vapor-liquid equilibrium (BVLE) or the binary vapor-liquid-liquid equilibrium (BVLLE).

Currently, Binary Phase Diagrams do not support Fluids that use the Electrolyte NRTL (eNRTL) method as the System method.

Concepts

• Unlike Trends and Profiles, Binary Phase Diagrams appear only on the Canvas, not in the Simulation Manager.

• A Binary Phase Diagram displays data for only one Fluid Type at a time.

• The Fluid Type that you use in the Binary Phase Diagram must contain at least two components and use either the Vapor/Liquid (VLE) or Vapor/Liquid1/Liquid2 (VLLE) selection in the Phases list.

• The Binary Phase Diagram automatically updates when you make any changes to the fluid that it uses or to the configuration of the Binary Phase Diagram.

• You can display the binary phase data in terms of either molar compositions (molar basis) or mass compositions (mass basis).

• You can specify the first component and second component in the binary system; the first component and second component should not be the same.

• The diagrams display plotted data based on the first component that you select for the Binary Phase Diagram configuration.

• You can generate the binary phase data at either a specified constant temperature or a specified constant pressure.

• Each Binary Phase Diagram has the following three tabs:

  • P-X-Y or T-X-Y

    This tab displays the dew curve and bubble curve. If you generate the BVLE or BVLLE data at a constant pressure, the curves include temperature vs. composition data and the tab is named T-X-Y. If you generate the BVLE or BVLLE data at a constant temperature, the curves include pressure vs. composition data and the tab is named P-X-Y.

  • X-Y

    This tab displays the equilibrium curve for the first component that you select for the Binary Phase Diagram configuration.

  • gamma-x

    This tab displays the activity coefficient values (gamma) with respect to liquid composition (x). You can view gamma-x data only when the Binary Phase Diagram is configured at a constant temperature and uses a vapor-liquid equilibrium (VLE) or vapor-liquid-liquid equilibrium (VLLE) Fluid.

• Binary Phase Diagrams that display BVLLE data have the following additional three tabs:

  • P-x1-x2 or T-x1-x2

    This tab displays the detailed liquid-liquid equilibrium data. If you generate the BVLLE data at a constant pressure, the curves include temperature vs. composition data and the tab is named T-x1-x2. If you generate the BVLLE data at a constant temperature, the curves include pressure vs. composition data and the tab is named P-x1-x2.

  • gamma-x1

    This tab shows the activity coefficient values with respect to the liquid composition in the Liquid 1 phase (x1). You can view gamma-x1 data only when you configure the Binary Phase Diagram at a constant temperature and use a vapor-liquid-liquid equilibrium (VLLE) Fluid.

  • gamma-x2

    This tab shows the activity coefficient values with respect to the liquid composition in the Liquid 2 phase (x2). You can view gamma-x2 data only when you configure the Binary Phase Diagram at a constant temperature and use a vapor-liquid-liquid equilibrium (VLLE) Fluid.

• Binary Phase Diagrams display data in the units of measure (UOMs) that are specified in the UOM Slate for the Simulation

Actions

• Create a Binary Phase Diagram on the Canvas.

• Select a Fluid Type for the Binary Phase Diagram; alternatively, drag a Fluid Type onto the Binary Phase Diagram.

• Select whether the Binary Phase Diagram displays data in terms of molar compositions (molar basis) or mass compositions (mass basis).

• Select the first and second component for the Binary Phase Diagram.

• Select whether AVEVA Process Simulation calculates the BVLE or BVLLE data at a constant pressure or at a constant temperature, and specify that constant value.

• For BVLE or BVLLE data, switch between the P-X-Y or T-X-Y tab, the X-Y tab, and the gamma-x tab to view the dew and bubble curves, the equilibrium curve, and the activity coefficient values, respectively.

• For BVLLE data, switch to the P-x1-x2 or T-x1-x2 tab to view the detailed equilibrium data between the two liquid phases.

• For BVLLE data that you configured at a constant temperature, switch to the gamma-x1 tab or the gamma-x2 tab to view the activity coefficient values with respect to the liquid composition in the Liquid 1 phase or the Liquid 2 phase, respectively.

• Change the number of intervals on the Binary Phase Diagram.

• Generate a Microsoft Excel report for the BVLE or BVLLE data.