Aspen Physical Property System - Physical Property Models

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IK-CAPE Liquid Viscosity Model The IK-CAPE liquid viscosity model includes both exponential and polynomial equations. Exponential Linear extrapolation of viscosity versus T occurs for temperatures outside bounds. Parameter Name/Element 250 3 Transport Property Models SymbolDefault MDS Lower Limit Upper Limit Units MULIKC/1 C 1i — X — — VISCOSITY MULIKC/2 C 2i 0 X — — TEMPERATURE ††† MULIKC/3 C 3i 0 X — — VISCOSITY MULIKC/4 C 4i 0 X — — TEMPERATURE MULIKC/5 C 5i 1000 X — — TEMPERATURE ††† Absolute temperature units are assumed for C2i. The temperature limits are always interpreted in user input units. Polynomial Linear extrapolation of viscosity versus T occurs for temperatures outside bounds. Parameter Symbol Default MDS Lower Name/Element Limit Upper Limit Units MULPO/1 C 1i — X — — VISCOSITY MULPO/2, ..., 10 C 2i, ..., C 10i 0 X — — VISCOSITY, TEMPERATURE MULPO/11 C 11i 0 X — — TEMPERATURE MULPO/12 C 12i 1000 X — — TEMPERATURE NIST TDE Equation Linear extrapolation of viscosity versus T occurs for temperatures outside bounds. Absolute temperature units are assumed for C2i, C3i, and C4i. The temperature limits are always interpreted in user input units. Parameter Symbol Default MDS Lower Name/Element Limit Upper Limit MULNVE/1 C 1i — X — — — Units
Parameter Symbol Default MDS Lower Name/Element Limit 3 Transport Property Models 251 Upper Limit Units MULNVE/2, 3, 4 C 2i, C 3i, C 4i 0 X — — TEMPERATURE MULNVE/5 C 5i 0 X — — TEMPERATURE MULNVE/6 C 6i 1000 X — — TEMPERATURE References R.C. Reid, J.M. Prausnitz, and B.E. Poling, The Properties of Gases and Liquids, 4th ed., (New York: McGraw-Hill, 1987), p. 439. API Liquid Viscosity The liquid mixture viscosity is calculated using a combination of the API and General equations. This model is recommended for petroleum and petrochemical applications. It is used in the CHAO-SEA, GRAYSON, LK-PLOCK, PENG-ROB, and RK-SOAVE option sets. For pseudocomponents, the API model is used: Where: fcn = A correlation based on API Procedures and Figures 11A4.1, 11A4.2, and 11A4.3 (API Technical Data Book, Petroleum Refining, 4th edition) Vm l is obtained from the API liquid volume model. For real components, the General model is used. Parameter Name/Element Symbol Default MDS Lower Limit Upper Limit Units TB T bi — — 4.0 2000.0 TEMPERATURE API API i — — -60.0 500.0 — API 1997 Liquid Viscosity The liquid mixture viscosity is calculated using a combination of the API and General equations. This model is recommended over the earlier API viscosity model. This model is applicable to petroleum fractions with normal boiling points from 150 F to 1200 F and API gravities between 0 and 75. Testing by AspenTech indicates that this model is slightly more accurate than the Twu model for light and medium boiling petroleum components, while the Twu model is superior for heavy fractions. For pseudocomponents, the API model is used: Where:
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Aspen Physical Property System Phys
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Contents Contents..................
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General Pure Component Solid Molar
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1 Introduction This manual describe
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Pure Component Temperature- Depende
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the Properties Parameters Pure-Comp
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2 Thermodynamic Property Models Thi
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Property Model Model Name Phase(s)P
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Property Model Model Name 2 Thermod
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Where: Parameter Name/Element 2 The
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critical temperature, the critical
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Where the ideal-gas contribution
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, where � For polar, associating
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Parameter Name/ Element 2 Thermodyn
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The denominator of equation 8 is gi
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V. V. De Leeuw and S. Watanasiri, "
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References M. Benedict, G. B. Webb,
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References L. Haar, J.S. Gallagher,
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Parameter Name/Element NTHDDH 0 †
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Gibbs free energy departure: The fo
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For a block copolymer, there is onl
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Copolymer PC-SAFT Dispersion Term T
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The association-site number of the
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Then I2(�) and I3(�) are comput
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A databank called PC-SAFT contains
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Parameter Name/Element PRKBV/1 k ij
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Predictive SRK (PSRK) This model us
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ka,ij kb,ij = = For best results, b
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J. Schwartzentruber and H. Renon, "
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Redlich-Kwong-Soave-MHV2 This equat
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‡ RKUC0, RKUC1, and RKUC2 are tre
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Parameter Name/ Element SRKLIJ/3 l
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Parameter Name/ Element Symbol Defa
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Association Equilibria Every associ
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and respectively. For the reactions
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R. W. Long, J. H. Hildebrand, and W
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Where the L, M, and N are parameter
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Alpha function Model name First Opt
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mi = Computed by equation 6 Equatio
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Parameter Name/Element 2 Thermodyna
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standard RKS alpha function, except
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These mixing rules are discussed se
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Where both Ai* and Am are calculate
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Like Huron and Vidal, the limiting
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Model Type Wilson Local composition
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Therefore, the simplified Pitzer eq
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Parameter Name/Element Symbol Defau
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Where: �i 2 Thermodynamic Propert
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The electrolyte NRTL model uses the
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Parameter Symbol No. of Name Elemen
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with Where: xi = Mole fraction of c
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It should be understood that equati
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The reference Gibbs energy is deter
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Where: j and k can be any species (
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The pure component dielectric const
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2 Thermodynamic Property Models 109
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�I *PDH = Pitzer-Debye-Hückel te
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Where: �i Vi = Activity coefficie
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Recommended cij Values for Differen
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Parameter Name/ Element 2 Thermodyn
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NRTL-SAC Reference States The NRTL-
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For an anionic component, we have M
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For a molecular segment, the activi
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Specifically, The long range intera
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where and are activity coefficients
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and Y+, are used to reflect the wid
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Parameter Name/ Element Symbol Defa
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Reference C.-C. Chen and Y. Song, "
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Parameter Name GMPTPS, GMPTP1, GMPT
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zi = Charge of ion i Subscripts c,
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For option code = 0 (default), the
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and for n-m electrolytes: 2 Thermod
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= 0.00979 Perform the necessary con
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Pitzer, K.S., J.R. Peterson, and L.
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A4,ij = gij / T + hij A5,ij = mij /
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Symmetric and Unsymmetric Electroly
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Parameter Symbol No. of Name Elemen
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Reference state for ionic component
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with 2 Thermodynamic Property Model
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G for these pairs is calculated the
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with 2 Thermodynamic Property Model
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Activity Coefficient Basis for Henr
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Where is the liquid Gibbs free ener
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Ionic components 2 Thermodynamic Pr
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the pure fused salts. Applying Eq.
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�k is the activity coefficient of
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References U. Weidlich and J. Gmehl
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ti' = �ij 2 Thermodynamic Propert
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Wagner Interaction Parameter The Wa
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References G.M. Wilson, J. Am. Chem
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Extended Antoine Equation Parameter
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IK-CAPE Vapor Pressure Equation The
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Harlacher and Braun, "A Four-Parame
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Parameter Name/Element 2 Thermodyna
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General Pure Component Heat of Vapo
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IK-CAPE Heat of Vaporization Equati
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Where: xp = Mole fraction of pseudo
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Parameter Name/Element VLBROC/1 V i
Page 201 and 202: Where: Vm l,t = Liquid volume per n
Page 203 and 204: Debye-Hückel Volume The Debye-Hüc
Page 205 and 206: DIPPR DIPPR equation 105 is the def
Page 207 and 208: Rackett The Rackett equation is: Wh
Page 209 and 210: Rackett/Campbell-Thodos Mixture Liq
Page 211 and 212: Zm RA Zi *,RA Vcm 2 Thermodynamic P
Page 213 and 214: General Pure Component Solid Molar
Page 215 and 216: Liquid Volume Quadratic Mixing Rule
Page 217 and 218: If THRSWT/6 is This equation is use
Page 219 and 220: Parameter Symbol Default MDS Lower
Page 221 and 222: General Pure Component Ideal Gas He
Page 223 and 224: (Other DIPPR equations may sometime
Page 225 and 226: General Pure Component Solid Heat C
Page 227 and 228: Parameter Name/Element 2 Thermodyna
Page 229 and 230: The expression for the liquid mole
Page 231 and 232: � Entropy: � Heat capacity: �
Page 233 and 234: Parameter Name † /Element CPIXPn/
Page 235 and 236: Option Codes for Electrolyte NRTL E
Page 237 and 238: Parameter Name Applicable Component
Page 239 and 240: For subcritical components: Hm l -H
Page 241 and 242: The vapor enthalpy is calculated fr
Page 243 and 244: Where: 2 Thermodynamic Property Mod
Page 245 and 246: Correlation algorithms for ionic sp
Page 247 and 248: Model Model name Phase(s) Pure Mixt
Page 249 and 250: Model Type Aspen Liquid Mixture Vis
Page 251: (Other DIPPR equations may sometime
Page 255 and 256: �i = Viscosity of component i (N-
Page 257 and 258: Parameter Name/Element 3 Transport
Page 259 and 260: Where: The Stockmayer or Lennard-Jo
Page 261 and 262: Where: Vcij = �ij = 0 (in almost
Page 263 and 264: Where: Vcij = �ij = 0 (in almost
Page 265 and 266: Jones-Dole Electrolyte Correction T
Page 267 and 268: Letsou-Stiel The Letsou-Stiel model
Page 269 and 270: Where: The parameter is the mole fr
Page 271 and 272: Reference C.H. Twu, "Internally Con
Page 273 and 274: Vcij 3 Transport Property Models 27
Page 275 and 276: You must provide parameters for the
Page 277 and 278: Linear extrapolation of � *,l ver
Page 279 and 280: If TRNSWT/4 is This equation is use
Page 285 and 286: Parameter Symbol Default MDS Lower
Page 289 and 290: References R.C. Reid, J.M. Prausnit
Page 291 and 292: The mixture surface tension is then
Page 295 and 296: Where: �solv = Dielectric constan
Page 297 and 298: 4 Nonconventional Solid Property Mo
Page 299 and 300: wij = Mass fraction of the jth cons
Page 301 and 302: The oxygen and organic sulfur conte
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The complete oxidation of carbon is
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The equation for �i dm is good fo
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5 Property Model Option Codes The f
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Model Name Option Code 5 Property M
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Model Name Option Code 5 Property M
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Soave-Redlich-Kwong Option Codes Th
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Model Name Option Code HLRELNRT and
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Model Name Option Code GLRELNRT, GL
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Index A activity coefficient models
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ideal gas/DIPPR heat capacity model
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S Sato-Riedel/DIPPR thermal conduct
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Aspen Physical Property System - Physical Property Models

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