3D. Liquid Density by COSTALD (Hankinson-Thomson) Method Back to Main
This page is used to determine the density of liquid using the
Hankinson-Brobst-Thomason method (COSTALD). For pure components, it employs the
basic equation: (Equation 3.22), which is the COSTALD
density correlation.
Where: =
molar volume of saturated liquid
= an
empirical constant similar to
in equation 3.20
It is typically with in 1 to 4% of
= SRK
acentric factor
and
=
reduced volume factors which depend on
This equation is also applicable for mixtures using mixing rules to
determine n * and . For liquid of known
composition, the COSTALD methods is probably the most general and most
accurate. For crude oils and condensates Density – Temperature
Correlation for Liquids (Figure 3.11) and Relative Density of Hydrocarbon
Mixtures (Figure 3.12) provides acceptable results for engineering
calculations.
To calculate the liquid density the Temperature, Pressure, and Mole % of the Liquid must be entered into their entry spaces. Once this has been done, select Run to execute the solution.
The component table is a list of the possible compounds along with their symbols to be used with this program. In the far right column titled Mole % use the mouse to choose the available cell and enter the Mole % of each component in the mixture. Use the Up and Down arrow keys to move from cell to cell. The total for the Mole % should be 100.00.
Temperature is the temperature of the Liquid in SI units Celsius and Kelvin or in English units Fahrenheit and Rankin.
° C = 0.556 (° F - 32), K = ° C + 273, ° F = (1.8)(° C) + 32, ° R = ° F + 460
Pressure is the force exerted per unit area of the liquid. For engineering purposes, absolute pressure is used.
To convert unit values of data, please refer to “Set Auto Convert and Unit Conversion” in the main page.