Water Solubility Methods

Three options are available for determining the solubility of water in the hydrocarbon phase for water decant calculations.

SimSci Method

A correlation developed by SimSci that relates water solubility to the number of carbon and hydrogen atoms in the component. For petroleum pseudocomponents, the water solubility is correlated with the Watson K Factor. This method is the default.

Components available for the SimSci method include: petroleum pseudocomponents, paraffins, unsaturates, naphthenes, aromatics, methyl mercaptan, NH3, CO2, HCl, N2, O2, CS2, Argon, Helium, H2S, NO and SO2. If other components are present in the system, their parameters are estimated and a warning message is issued.

SIMSCI (Extrapolation method)

When SIMSCI method is used for calculating "Solubility of water in hydrocarbon", it has a limitation for temperatures below 0 deg C. If tried below 0 Deg C, SIMSCI method defaults to one value. In such a case, make use of SIMSCI (Extrapolation method) to get the extrapolated values in this temperature region.

Kerosene Correlation

The curve for kerosene on Figure 9A1.2 in the API Technical Data Book is used to determine the solubility of water in the hydrocarbon liquid.

Compute from Equation of State

The equation of state which is used for the hydrocarbon components is used to compute the water K-value. Missing parameters for the water-hydrocarbon pairs are estimated with the SRK-Kabadi-Danner method. This option is only available when the Soave-Redlich-Kwong or Peng-Robinson methods are used.