AQUAlibrium©

Software for Phase Equilibria in Natural Gas-Water Systems

Vapor-Liquid-Liquid Equilibrium Calculations

Some of the components in natural gas will begin to liquefy if the temperature is low or if the pressure is sufficiently large. In these cases, three phases will coexist: (1) vapor, (2) an aqueous liquid, and (3) non-aqueous liquid (called a condensate). Follow this link for an introduction to three-phase equilibrium in natural gas-water systems.

AQUAlibrium includes the following three-phase calculations:

  1. Vapor-aqueous liquid-non-aqueous liquid flash calculation: Input the temperature, pressure and feed composition and calculate the compositions of the coexisting phases.

  2. Vapor-aqueous liquid-non-aqueous liquid normal dew point pressure calculation: Input the temperature and feed composition and calculate the pressure at which the third phase (non-aqueous liquid) begins to form and the compositions of the coexisting phases. For pressures less than the normal dew point pressure, only two phases exist in equilibrium.

  3. Vapor-aqueous liquid-non-aqueous liquid retrograde dew point pressure calculation: Input the temperature and feed composition and calculate the pressure at which the third phase (non-aqueous liquid) begins to form and the compositions of the coexisting phases. For pressures greater than the retrograde dew point pressure, only two phases exist in equilibrium.

  4. Vapor-aqueous liquid-non-aqueous liquid dew point temperature calculation: Input the temperature and feed composition and calculate the pressure at which the third phase (non-aqueous liquid) begins to form and the compositions of the coexisting phases. For pressures less than the dew point pressure, only two phases exist in equilibrium.

  5. Vapor-aqueous liquid-non-aqueous liquid bubble point pressure calculation: Input the temperature and feed composition and calculate the pressure at which the vapor phase disappears and the compositions of the coexisting phases. For pressures greater than the bubble point, two liquids are in equilibrium.

  6. Vapor-aqueous liquid-non-aqueous liquid bubble point temperature calculation: Input the pressure and feed composition and calculate the pressure at which the vapor phase disappears and the compositions of the coexisting phases. For pressures greater than the bubble point, two liquids are in equilibrium.

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For more information please contact us at:

AQUAlibrium
P.O. Box 55219
Temple Postal Outlet
Calgary, Alberta, CANADA T1Y 6R6

Or via E-mail at: AQUAlibrium

This page, and all its contents, are Copyright © 1998 by John J. Carroll, Alberta, CANADA.