CO2 Storage (eNRTL / Duan-Sun)

DWSIM Plus

Available with a DWSIM Plus (Patreon) subscription.

Property package for CO2 geological storage: CO2 with water and chloride brines at reservoir conditions. CO2 solubility in the brine from the Duan-Sun model, water from IAPWS-IF97, the CO2-rich phase from Peng-Robinson, brine density with dissolved CO2, carbonate speciation (pH) and saturation indices of carbonate minerals.

DWSIM.Extensions.PropertyPackages.CCUS.Storage.CO2StoragePropertyPackage
Assembly DWSIM.Extensions.PropertyPackages.CCUS.dll · Object ← PropertyPackage ← ElectrolyteBasePropertyPackage ← BaseElectrolytePropertyPackage ← CO2StoragePropertyPackage
Name in the flowsheet CO2 Storage (eNRTL/Duan-Sun) · FluentAPI PropertyPackages.Plus.CO2Storage

Scope

The package describes CO₂ with water and chloride brines at the conditions of geological storage: saline aquifer injection, CO₂-enhanced oil recovery, and the brine chemistry that leads to mineral trapping. The apparent compounds are water, CO₂, other gases, and the ions or salts of the brine (for instance Sodium (ion) and Chloride (ion), or a salt such as sodium chloride). Ions and salts are non-volatile and stay in the liquid. All parameters are compiled into the package; it reads no data files.

The phase equilibrium combines four parts, run through the standard vapor-liquid flash of DWSIM:

• CO₂ in the aqueous phase from the model of Duan and Sun (2003), with the salting-out terms of Duan et al. (2006) for Na⁺, K⁺, Ca²⁺, Mg²⁺, Cl^- and SO₄^2-. The liquid fugacity of CO₂ is referred to a water-saturated CO₂ phase computed with Peng-Robinson, so under a CO₂ phase the flash returns the Duan-Sun solubility (within 0.25 % in pure water). Other ions are counted by their charge as one of these classes.
• Water from IAPWS-IF97 (vapor pressure and liquid volume), with the Poynting correction and Raoult's law on the dissolved particles.
• The CO₂-rich phase from Peng-Robinson, with k_ij(CO₂-H₂O) = 0.193 fitted to the water content of the Spycher, Pruess and Ennis-King (2003) model. A liquid without water (dense CO₂) takes the fugacity of pure CO₂ from Span-Wagner.
• H₂S and the supercritical gases by Henry's law.

Density and enthalpy. The brine density is IAPWS-IF97 water plus the apparent molar volumes of NaCl, KCl, CaCl₂ and MgCl₂ (fitted to Al Ghafri, Maitland and Trusler 2012) and of dissolved CO₂ (fitted to McBride-Wright, Maitland and Trusler 2015). The liquid enthalpy carries the heat of solution of CO₂ from the temperature dependence of the Duan-Sun model.

pH and minerals. The pH and ionic strength come from a carbonate speciation at the total dissolved carbon (constants of Edwards et al. 1978, Davies activity coefficients), returned by Speciate and LastSpeciation. CalculateMineralEquilibrium gives the saturation indices of calcite, magnesite, siderite and dolomite; dawsonite has a solubility product only, since the package carries no aluminium species.

Validity. Duan-Sun covers 273 to 533 K and up to 2000 bar; the densities were fitted from 283 to 473 K and up to 700 bar; NaCl up to about 6 mol/kg.

Accuracy (NIST ThermoML data; no parameter was fitted to the CO₂ solubilities):

Quantity	Data	Average deviation
CO2 solubility in water	346 points, 9 sets	2.6 %
CO2 solubility in NaCl brines, 1 to 6 mol/kg	580 points, 5 sets	2.6 %
CO2 solubility in KCl, CaCl2, MgCl2 brines	Kamps 2007, Tong 2013, Messabeb 2017	18, 11 and 10 % low
Brine density, four salts	Al Ghafri 2012 (fit)	0.4 to 0.7 kg/m3
NaCl brine with CO2	Song 2013 (check)	1.6 kg/m3
CO2-saturated water	Hebach 2004 (check)	1.0 kg/m3
Heat of solution of CO2	Koschel 2006, 22 points	0.30 kJ/mol
Water in the CO2 phase	Kim 2012, 25 points	7.3 %
Water vapor pressure over NaCl brine	Nasirzadeh 2004, 42 points	0.9 %

Limitations

• Duan and Sun count K⁺ as Na⁺ and Mg²⁺ as Ca²⁺, so the model salts out more CO₂ than measured in KCl, CaCl₂ and MgCl₂ brines, most at high molality and low temperature: up to 24 % at 6 mol/kg CaCl₂ and 15 % at 5 mol/kg MgCl₂.
• The flash forms no solid salt phase: a brine that dries out (at 473 K and 1 bar, for instance) does not precipitate its salt.
• The water content of the CO₂ phase follows Spycher and Pruess and the dew points of Kim et al. (2012); the Raman data of Wang et al. (2018) lie well above both.
• Raoult's law carries no osmotic coefficient: the water vapor pressure over 3.6 mol/kg NaCl comes out 2.2 % high.
• The pH and the saturation indices use Davies activity coefficients and are indicative above an ionic strength of about 0.5 mol/kg.

Example

This code runs on every build of this site, and the output below is what it printed.

Python

fs = (Flowsheet.Create("CO2StorageExample")
      .WithCompounds("Water", "Carbon dioxide", "Sodium (ion)", "Chloride (ion)")
      .WithPropertyPackage(PropertyPackages.Plus.CO2Storage))

water = 1.0 / 0.018015                    # mol/s in 1 kg/s of water

def stream(name, nacl, co2):
    # 1 kg/s of water with nacl mol/s of Na+ and Cl- (molality) and co2 mol/s of CO2,
    # at reservoir conditions; 2 mol of CO2 per kg of water is more than dissolves
    b = (fs.AddMaterialStream(name).At(Q.Celsius(60.0), Q.Bar(150.0))
         .SetCompoundMolarFlow("Water", water)
         .SetCompoundMolarFlow("Carbon dioxide", co2))
    if nacl > 0.0:
        b.SetCompoundMolarFlow("Sodium (ion)", nacl).SetCompoundMolarFlow("Chloride (ion)", nacl)
    return b

brine_co2 = stream("Brine + CO2", 1.0, 2.0)
water_co2 = stream("Water + CO2", 0.0, 2.0)
brine = stream("Brine", 1.0, 0.0)
fs.Solve()

def co2_molality(liquid):                 # mol CO2 per kg of water
    x = liquid.Compounds
    return x["Carbon dioxide"].MoleFraction / (x["Water"].MoleFraction * 0.018015)

s = brine_co2.Object
aq, co2_phase = s.Phases[3], s.Phases[2]  # the brine, and the CO2-rich phase
print(f"CO2 dissolved     = {co2_molality(aq):.3f} mol/kg in the brine, "
      f"{co2_molality(water_co2.Object.Phases[3]):.3f} mol/kg in pure water")
print(f"pH of the brine   = {aq.Properties.pH:.2f} with CO2, {brine.Object.Phases[3].Properties.pH:.2f} without")
print(f"Brine density     = {aq.Properties.density:.1f} kg/m3 with CO2, "
      f"{brine.Object.Phases[3].Properties.density:.1f} without")
print(f"Water in the CO2-rich phase = {co2_phase.Compounds['Water'].MoleFraction * 100:.2f} mol%")

Output

CO2 dissolved     = 0.949 mol/kg in the brine, 1.162 mol/kg in pure water
pH of the brine   = 3.12 with CO2, 6.52 without
Brine density     = 1033.3 kg/m3 with CO2, 1027.1 without
Water in the CO2-rich phase = 0.71 mol%

DWSIM 10.2.11.0, generated 2026-10-08.

Property methods

How the package calculates each property, as it reports it in PropertyMethodsInfo (the property package editor shows the same list).

Property	Method
Vapor fugacity	Peng-Robinson EOS, kij(CO2-water) = 0.193
Liquid fugacity	Duan-Sun (CO2), vapour pressure with Poynting correction and Raoult's law on the solutes (water), Henry's law (other gases)
Vapor enthalpy, entropy, Cp/Cv	Ideal Gas + Peng-Robinson residual
Liquid enthalpy, entropy, Cp/Cv	Ideal gas less heat of vaporization + heat of solution of CO2 (Duan-Sun) + brine excess enthalpy (eNRTL, when enabled); liquid without water: as the vapour; Cp: water and aqueous ion heat capacities, Cv = Cp
Vapor density	Ideal Gas
Liquid density	IAPWS-IF97 water + apparent molar volumes of salts and CO2; liquid without water: Peng-Robinson EOS
Vapor viscosity	Experimental / Lucas / Jossi-Stiel-Thodos
Liquid viscosity	Experimental / Letsou-Stiel (solvent) with the Jones-Dole correction for the ions
Vapor thermal conductivity	Experimental / Ely-Hanley
Liquid thermal conductivity	Experimental / Latini (solvent) with the Riedel correction for the ions
Surface tension	Experimental / Brock-Bird
Solid density	Experimental Data / User-Defined
Solid enthalpy, entropy, Cp/Cv	Experimental Solid Cp / From Liquid Phase Enthalpy + Enthalpy of Fusion

Default flash algorithm: Nested_Loops_VLE.

Configuration saved with the flowsheet

The package writes its settings to the simulation file (SaveData) and reads them back on load (LoadData). The elements below are the ones this package adds to those of every property package, as written for the example.

Element	Content in the example	What it holds
ElectrolyteFlash_ReactionSetID	DefaultSet	Setting of the legacy electrolyte flash (ElectrolyteSVLE) that the base class saves; the flash of this package does not read it
ElectrolyteFlash_Tolerance	1E-07	The same, the tolerance of that flash
ElectrolyteFlash_MaximumIterations	200	The same, its iteration limit
IncludeExcessEnthalpy	false	Adds the eNRTL excess enthalpy of the brine to the liquid enthalpy (off by default)
GenerateSolubilityReactions	false	Salt dissolution equilibria of the base electrolyte package; not used here, since the package replaces its chemical equilibria
UseReactiveKvalues	false	Not used here; the columns take the K-values the flash converges on

Settings common to every property package, as saved for the example

Element	Value
Type	72 characters
ComponentName	CO2 Storage (eNRTL/Duan-Sun)
ComponentDescription	69 characters
Tag	CO2 Storage (eNRTL/Duan-Sun)
UseHenryConstants	true
AutoEstimateMissingNRTLUNIQUACParameters	true
UseImmiscibleListForLiquid2InitialEstimates	true
SingleCompoundCheckThreshold	0.99999
OverrideKvalFugCoeff	false
OverrideEnthalpyCalculation	false
OverrideEntropyCalculation	false
LiquidDensityCalculationMode_Subcritical	Rackett_and_ExpData
LiquidDensityCalculationMode_Supercritical	Rackett_and_ExpData
LiquidDensity_CorrectExpDataForPressure	true
LiquidDensity_UsePenelouxVolumeTranslation	true
LiquidViscosityCalculationMode_Subcritical	ExpData
LiquidViscosityCalculationMode_Supercritical	Letsou_Stiel
LiquidViscosity_CorrectExpDataForPressure	true
LiquidViscosity_MixingRule	MoleAverage
VaporPhaseFugacityCalculationMode	Ideal
SolidPhaseFugacityCalculationMethod	FromLiquidFugacity
SolidPhaseFugacity_UseIdealLiquidPhaseFugacity	false
SolidPhaseEnthalpy_UsesCp	false
EnthalpyEntropyCpCvCalculationMode	LeeKesler
LiquidEnthalpyEntropyCpCvCalculationMode_EOS	EOS
LiquidFugacity_UsePoyntingCorrectionFactor	true
ActivityCoefficientModels_IgnoreMissingInteractionParameters	false
IgnoreVaporFractionLimit	false
IgnoreSalinityLimit	false
CalculateAdditionalMaterialStreamProperties	true
FlashCalculationApproach	NestedLoops
DisplayMissingCompoundPropertiesWarning	false
ForcedSolids	[]
PropertyOverrides	{}
FlashSettings	36 Setting entries

Learn more

• User guide

  ---

  • CO\(_2\) Storage (Duan–Sun)

• Used with

  ---

  • Separator Vessel
  • Pipe Segment
  • Compressor
  • Mixer

API members

Public members declared by this class. Inherited members are documented on the base classes.

Constructors

CO2StoragePropertyPackage()

C#VB.NET

public CO2StoragePropertyPackage()

Public Sub New()

CO2StoragePropertyPackage(bool)

Parameter	Type	Description
comode	Boolean

C#VB.NET

public CO2StoragePropertyPackage(bool comode)

Public Sub New(comode As Boolean)

Properties

FlashBase: A vapour-liquid flash on DW_CalcFugCoeff, with the algorithm DWSIM picks for a molecular package.

A vapour-liquid flash on DW_CalcFugCoeff, with the algorithm DWSIM picks for a molecular package.

C#VB.NET

public override FlashAlgorithm FlashBase { get; }

Public Overrides ReadOnly Property FlashBase As FlashAlgorithm

ImplementsAnalyticalDerivatives

C#VB.NET

public override bool ImplementsAnalyticalDerivatives { get; }

Public Overrides ReadOnly Property ImplementsAnalyticalDerivatives As Boolean

ImplementsCrossPlatformEditor

C#VB.NET

public override bool ImplementsCrossPlatformEditor { get; }

Public Overrides ReadOnly Property ImplementsCrossPlatformEditor As Boolean

LastSpeciation: Carbonate speciation of the last liquid whose pH or ionic strength was calculated, or null.

Carbonate speciation of the last liquid whose pH or ionic strength was calculated, or null.

C#VB.NET

public CarbonateSpeciation LastSpeciation { get; }

Public ReadOnly Property LastSpeciation As CarbonateSpeciation

ShouldUseKvalueMethod3: The columns take DW_CalcKvalue, the K-values the flash converges on, with UseReactiveKvalues on or off.

The columns take DW_CalcKvalue, the K-values the flash converges on, with UseReactiveKvalues on or off.

C#VB.NET

public override bool ShouldUseKvalueMethod3 { get; }

Public Overrides ReadOnly Property ShouldUseKvalueMethod3 As Boolean

Methods

AUX_LIQDENS(double, Array, double, double, bool): Density of an aqueous liquid from BrineDensity: water, the chlorides of the brine's cations, dissolved CO2, and any...

Density of an aqueous liquid from BrineDensity: water, the chlorides of the brine's cations, dissolved CO2, and any other molecular solute at its own liquid molar volume. A liquid without water or ions (dense CO2 that a flash labels liquid) takes the Peng-Robinson density of the CO2-rich phase, as it takes its enthalpy, so that its label does not change its density. Any other liquid takes the electrolyte packages' density.

Parameter	Type	Description
T	Double
Vx	Array
P	Double
Pvp	Double
FORCE_EOS	Boolean

C#VB.NET

public override double AUX_LIQDENS(double T, Array Vx, double P = 0, double Pvp = 0, bool FORCE_EOS = false)

Public Overrides Function AUX_LIQDENS(T As Double, Vx As Array, P As Double = 0, Pvp As Double = 0, FORCE_EOS As Boolean = False) As Double

AUX_LIQDENS(double, double, double, int, bool): The phase overload the phase properties are calculated with, which the electrolyte base class answers on its own...

The phase overload the phase properties are calculated with, which the electrolyte base class answers on its own: the same density for an aqueous liquid and for dense CO2.

Parameter	Type	Description
T	Double
P	Double
Pvp	Double
phaseid	Int32
FORCE_EOS	Boolean

C#VB.NET

public override double AUX_LIQDENS(double T, double P = 0, double Pvp = 0, int phaseid = 3, bool FORCE_EOS = false)

Public Overrides Function AUX_LIQDENS(T As Double, P As Double = 0, Pvp As Double = 0, phaseid As Integer = 3, FORCE_EOS As Boolean = False) As Double

AUX_VAPDENS(double, double): Vapour density: Peng-Robinson on the vapour phase, the equation of state of its fugacities and enthalpy.

Vapour density: Peng-Robinson on the vapour phase, the equation of state of its fugacities and enthalpy. The electrolyte packages' density was the ideal gas.

Parameter	Type	Description
T	Double
P	Double

C#VB.NET

public override double AUX_VAPDENS(double T, double P)

Public Overrides Function AUX_VAPDENS(T As Double, P As Double) As Double

Brine(Array, out double, out double): The ions of the liquid Vx on a molality basis, with the molalities of CO2 and of the other molecular solutes; null...

The ions of the liquid Vx on a molality basis, with the molalities of CO2 and of the other molecular solutes; null when the liquid holds no water.

Parameter	Type	Description
Vx	Array
mCO2	Double	CO2 [mol/kg H2O]
mOther	Double	molecular solutes other than CO2 [mol/kg H2O]

C#VB.NET

public BrineIons Brine(Array Vx, out double mCO2, out double mOther)

Public Function Brine(Vx As Array, mCO2 As Double, mOther As Double) As BrineIons

CalculateChemicalEquilibria(double, double)

Parameter	Type	Description
T	Double
P	Double

C#VB.NET

public override EquilibriumResult CalculateChemicalEquilibria(double T, double P)

Public Overrides Function CalculateChemicalEquilibria(T As Double, P As Double) As EquilibriumResult

CalculateChemicalEquilibria(double, double, double[])

Parameter	Type	Description
T	Double
P	Double
x	Double[]

C#VB.NET

public override EquilibriumResult CalculateChemicalEquilibria(double T, double P, double[] x)

Public Overrides Function CalculateChemicalEquilibria(T As Double, P As Double, x As Double()) As EquilibriumResult

CalculateCO2Solubility(double, double): CO2 solubility [mol/kg H2O] at (T [K], P [Pa]) in the brine of the stream's overall composition, under a CO2 phase...

CO2 solubility [mol/kg H2O] at (T [K], P [Pa]) in the brine of the stream's overall composition, under a CO2 phase with water at its vapour pressure.

Parameter	Type	Description
T	Double
P	Double

C#VB.NET

public double CalculateCO2Solubility(double T, double P)

Public Function CalculateCO2Solubility(T As Double, P As Double) As Double

CalculateCO2Solubility(double, double, double)

Parameter	Type	Description
T	Double
P	Double
mNaCl	Double

C#VB.NET

public double CalculateCO2Solubility(double T, double P, double mNaCl)

Public Function CalculateCO2Solubility(T As Double, P As Double, mNaCl As Double) As Double

CalculateMineralEquilibrium(double)

Parameter	Type	Description
T	Double

C#VB.NET

public List<MineralEquilibriumResult> CalculateMineralEquilibrium(double T)

Public Function CalculateMineralEquilibrium(T As Double) As List(Of MineralEquilibriumResult)

CalculateMineralEquilibrium(double, Dictionary<string, double>)

Parameter	Type	Description
T	Double
ionMolalities	Dictionary<String,Double>

C#VB.NET

public List<MineralEquilibriumResult> CalculateMineralEquilibrium(double T, Dictionary<string, double> ionMolalities)

Public Function CalculateMineralEquilibrium(T As Double, ionMolalities As Dictionary(Of String, Double)) As List(Of MineralEquilibriumResult)

Clone()

C#VB.NET

public override PropertyPackage Clone()

Public Overrides Function Clone() As PropertyPackage

DW_CalcdKdT(double[], double[], double, double, string)

Parameter	Type	Description
Vx	Double[]
Vy	Double[]
T	Double
P	Double
type	String

C#VB.NET

public override double[] DW_CalcdKdT(double[] Vx, double[] Vy, double T, double P, string type = "LV")

Public Overrides Function DW_CalcdKdT(Vx As Double(), Vy As Double(), T As Double, P As Double, type As String = "LV") As Double()

DW_CalcdLnFugCoeffdn(double[], double, double, State): Composition (mole-number) derivative of the natural logarithm of the fugacity coefficients, d(ln phi_i)/dn_j, for...

Composition (mole-number) derivative of the natural logarithm of the fugacity coefficients, d(ln phi_i)/dn_j, for the given phase, evaluated on a total-moles = 1 basis. Returns an (nc x nc) matrix. Base implementation is a finite difference in mole numbers; EOS/activity packages override this with the closed-form partial-molar expression.

Parameter	Type	Description
Vx	Double[]
T	Double
P	Double
st	State

C#VB.NET

public override double[,] DW_CalcdLnFugCoeffdn(double[] Vx, double T, double P, State st)

Public Overrides Function DW_CalcdLnFugCoeffdn(Vx As Double(), T As Double, P As Double, st As State) As Double(,)

DW_CalcdLnFugCoeffdT(double[], double, double, State): Temperature derivative of the natural logarithm of the fugacity coefficients, d(ln phi_i)/dT, for the given phase.

Temperature derivative of the natural logarithm of the fugacity coefficients, d(ln phi_i)/dT, for the given phase. Base implementation is a forward finite difference; EOS/activity packages override this with a closed-form expression. Distinct from DW_CalcdFugCoeffdT, which returns d(phi)/dT (not the logarithm).

Parameter	Type	Description
Vx	Double[]
T	Double
P	Double
st	State

C#VB.NET

public override double[] DW_CalcdLnFugCoeffdT(double[] Vx, double T, double P, State st)

Public Overrides Function DW_CalcdLnFugCoeffdT(Vx As Double(), T As Double, P As Double, st As State) As Double()

DW_CalcEnthalpy(Array, double, double, State): Liquid: dissolved CO2 sits on its ideal gas reference, without a heat of vaporisation, plus its heat of solution...

Liquid: dissolved CO2 sits on its ideal gas reference, without a heat of vaporisation, plus its heat of solution from the Duan-Sun chemical potential; the rest of the liquid is the electrolyte packages' enthalpy. Vapour: ideal gas plus the residual enthalpy of the Peng-Robinson fugacities the flash uses, about −10 kJ/mol for CO2 at 50 °C and 200 bar. A liquid without water (dense CO2 that a flash called liquid) takes the vapour's enthalpy on the same equation of state, so that its label does not change its enthalpy.

Parameter	Type	Description
Vx	Array
T	Double
P	Double
st	State

C#VB.NET

public override double DW_CalcEnthalpy(Array Vx, double T, double P, State st)

Public Overrides Function DW_CalcEnthalpy(Vx As Array, T As Double, P As Double, st As State) As Double

DW_CalcEntropy(Array, double, double, State): Entropy to match DW_CalcEnthalpy: the solution term enters as H/T, the entropy change of a step taken at...

Entropy to match DW_CalcEnthalpy: the solution term enters as H/T, the entropy change of a step taken at equilibrium; the vapour takes its residual entropy.

Parameter	Type	Description
Vx	Array
T	Double
P	Double
st	State

C#VB.NET

public override double DW_CalcEntropy(Array Vx, double T, double P, State st)

Public Overrides Function DW_CalcEntropy(Vx As Array, T As Double, P As Double, st As State) As Double

DW_CalcFugCoeff(Array, double, double, State): Liquid: water at its vapour pressure with the Poynting correction and Raoult's law on the dissolved particles; CO2...

Liquid: water at its vapour pressure with the Poynting correction and Raoult's law on the dissolved particles; CO2 by Duan-Sun when the liquid holds water, as pure CO2 by Span-Wagner when it does not; H2S and supercritical gases by Henry's law; ions and salts non-volatile. Vapour: Peng-Robinson on the molecular compounds.

Parameter	Type	Description
Vx	Array
T	Double
P	Double
st	State

C#VB.NET

public override double[] DW_CalcFugCoeff(Array Vx, double T, double P, State st)

Public Overrides Function DW_CalcFugCoeff(Vx As Array, T As Double, P As Double, st As State) As Double()

DW_CalcKvalue3(double[], double[], double, double): DW_CalcKvalue on the normalised liquid and vapour, for a caller that asks for the reactive route by name.

DW_CalcKvalue on the normalised liquid and vapour, for a caller that asks for the reactive route by name. Amounts in, as the columns pass them; with no vapour the liquid stands in for it.

Parameter	Type	Description
Vnx	Double[]
Vny	Double[]
T	Double
P	Double

C#VB.NET

public override double[] DW_CalcKvalue3(double[] Vnx, double[] Vny, double T, double P)

Public Overrides Function DW_CalcKvalue3(Vnx As Double(), Vny As Double(), T As Double, P As Double) As Double()

DW_CalcPhaseProps(Phase): The vapour's compressibility factor follows its density; the electrolyte packages wrote 1.

The vapour's compressibility factor follows its density; the electrolyte packages wrote 1.

Parameter	Type	Description
Phase	Phase

C#VB.NET

public override void DW_CalcPhaseProps(Phase Phase)

Public Overrides Sub DW_CalcPhaseProps(Phase As Phase)

DW_CalcProp(string, Phase): pH and ionic strength of a liquid come from its carbonate speciation, which LastSpeciation then...

pH and ionic strength of a liquid come from its carbonate speciation, which LastSpeciation then holds; everything else is the electrolyte packages' own.

Parameter	Type	Description
property	String
phase	Phase

C#VB.NET

public override void DW_CalcProp(string property, Phase phase)

Public Overrides Sub DW_CalcProp([property] As String, phase As Phase)

GetEditingForm(): Returns the binary interaction parameter editor of this package.

Returns the binary interaction parameter editor of this package.

C#VB.NET

public override object GetEditingForm()

Public Overrides Function GetEditingForm() As Object

PopulateCrossPlatformEditor(object): The package has no adjustable parameters: the panel lists the solubility model, the trapping minerals and the model...

The package has no adjustable parameters: the panel lists the solubility model, the trapping minerals and the model, mirroring the Windows editor.

Parameter	Type	Description
container	Object

C#VB.NET

public override void PopulateCrossPlatformEditor(object container)

Public Overrides Sub PopulateCrossPlatformEditor(container As Object)

RET_VNONVOLATILE(): Ions and salts are non-volatile: the flash keeps them in the liquid.

Ions and salts are non-volatile: the flash keeps them in the liquid.

C#VB.NET

public override bool[] RET_VNONVOLATILE()

Public Overrides Function RET_VNONVOLATILE() As Boolean()

RET_VPVAP(double): Vapour pressures the flash starts its K-values from.

Vapour pressures the flash starts its K-values from. With water in the compound list, CO2 and H2S take their Henry's constants on the mole-fraction scale instead, which is what they dissolve by: the extrapolated vapour pressure of CO2 is below a reservoir pressure, and the flash then took any feed with CO2 for an all-liquid one without a single K-value.

Parameter	Type	Description
T	Double

C#VB.NET

public override double[] RET_VPVAP(double T)

Public Overrides Function RET_VPVAP(T As Double) As Double()

ReturnInstance(string)

Parameter	Type	Description
typename	String

C#VB.NET

public override object ReturnInstance(string typename)

Public Overrides Function ReturnInstance(typename As String) As Object

RunPostMaterialStreamSetRoutine()

C#VB.NET

public override void RunPostMaterialStreamSetRoutine()

Public Overrides Sub RunPostMaterialStreamSetRoutine()

SaveData(): Writes IncludeExcessEnthalpy, GenerateSolubilityReactions and UseReactiveKvalues after the data the base package...

Writes IncludeExcessEnthalpy, GenerateSolubilityReactions and UseReactiveKvalues after the data the base package saves, so the three options travel with the flowsheet file and with Clone.

C#VB.NET

public override List<XElement> SaveData()

Public Overrides Function SaveData() As List(Of XElement)

Speciate(Array, double, double): Carbonate speciation of the liquid Vx at (T, P [Pa]); null when it holds no water.

Carbonate speciation of the liquid Vx at (T, P [Pa]); null when it holds no water.

Parameter	Type	Description
Vx	Array
T	Double
P	Double

C#VB.NET

public CarbonateSpeciation Speciate(Array Vx, double T, double P)

Public Function Speciate(Vx As Array, T As Double, P As Double) As CarbonateSpeciation

Fields

ClassId

C#VB.NET

public const string ClassId = "D5E6F7A8-9012-4B34-C567-890123456789"

Public Const ClassId As String = "D5E6F7A8-9012-4B34-C567-890123456789"