Instead, it terminates at a point on the phase diagram called the critical point. Two phases can exist at a pressure greater than critical pressure and at a temperature greater than critical temperature, unlike a pure component system. There is also the A complex phase diagram of great technological importance is that of the The x-axis of such a diagram represents the concentration variable of the mixture. The line connecting the triple point and critical points is the vapor pressure curve; the extension below the triple point is sublimation point.

Figure 5‑3 shows the general behavior for a fixed composition of a system consisting of two or more components. When going from the liquid to the gaseous phase, one usually crosses the phase boundary, but it is possible to choose a path that never crosses the boundary by going to the right of the critical point. If we take our slice at a pressure of one atmosphere the new diagram, called a boiling diagram, would look something like, Vapor Pressure Diagrams and Boiling Diagrams … So there is a region that two phases are at equilibrium. At this condition, at some points in the process two phases would form and the dry gas would displace butane immiscibility at reduced microscopic displacement efficiency. Some of the major features of phase diagrams include congruent points, where a solid phase transforms directly into a liquid. The solid–liquid phase boundary can only end in a critical point if the solid and liquid phases have the same For most substances, the solid–liquid phase boundary (or fusion curve) in the phase diagram has a positive Water is an exception which has a solid-liquid boundary with negative slope so that the melting point decreases with pressure. So some amount of the butane may be bypassed during the displacement by dry gas and trapped in the reservoir. Fluid Phase Behavior: Pressure-Temperature Diagram (P-T Diagram) Figure 5‑2 shows a P-T diagram for a pure component. As it shows, there is a transition zone between the complete liquid phase and complete vapor phase. Note that as well as showing the Pressure-temperature diagram in different ways (sometimes with pressure increasing downwards), the units can also vary. Two phases region that is bounded by the bubble point and dew point curves is called “phase envelope”. Thus, the liquid and gaseous phases can blend continuously into each other.

The open spaces, where the In the diagram on the right, the phase boundary between liquid and gas does not continue indefinitely. In that case, One type of phase diagram plots temperature against the relative concentrations of two substances in a A simple example diagram with hypothetical components 1 and 2 in a non-In addition to the above-mentioned types of phase diagrams, there are thousands of other possible combinations. Examples of such thermodynamic properties include Any two thermodynamic quantities may be shown on the horizontal and vertical axes of a two-dimensional diagram. The simplest phase diagrams are pressure–temperature diagrams of a single simple substance, such as water. As this figure shows in pure materials, by decreasing the pressure at a fixed temperature, phase change happens just at a point (vapor pressure curve is a line).

The phase diagram shows, in pressure–temperature space, the lines of equilibrium or phase boundaries between the three phases of solid, liquid, and gas. So a minimum miscible pressure for each temperature could be determined according to graph’s data such as Figure 5‑4. Reservoir fluids are mainly composed of hydrocarbons with similar structure so their phase behavior is not generally highly complex.


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