Aspen Physical Property System - Physical Property Models

Model Name Option
Code
312 5 Property Model Option Codes
Value Descriptions
2 Reference state for ions is symmetric: pure fused
salts
2 0 Flory-Huggins term included (default)
1 Flory-Huggins term removed
3 0 Long-range interaction term included (default)
1 Long-range interaction term removed
Option Codes for Equation of
State Models
Model Name Option
Code
Value Descriptions
ESBWRS, ESBWRS0 1 0 Do not use steam tables
ESHOC, ESHOC0,
PHV0HOC
ESPR, ESPR0,
ESPRSTD,
ESPRSTD0
1 Calculate properties (H, S, G, V) of water from
steam table (default; see Note)
2 0 Original RT-Opt root search method (default)
1 VPROOT/LQROOT Aspen Plus root search
method. Use this if the equation-oriented Aspen
Plus solution fails to converge and some
streams with missing phases show the same
properties for the missing phase as for another
phase.
1 0 Hayden-O'Connell model. Use chemical theory
only if one component has HOCETA=4.5
(default)
1 Always use the chemical theory regardless of
HOCETA values
2 Never use the chemical theory regardless of
HOCETA values
2 0 Check high-pressure limit. If exceeded,
calculate volume at cut-off pressure.
1 Ignore high-pressure limit. Calculate volume
model T and P.
1 0 ASPEN Boston/Mathias alpha function when T r
>1, original literature alpha function otherwise.
(default for ESPR)
1 Original literature alpha function (default for
ESPRSTD)
2 Extended Gibbons-Laughton alpha function
3 Twu Generalized alpha function
4 Twu alpha function
2 0 Standard Peng-Robinson mixing rules (default)
1 Asymmetric Kij mixing rule from Dow
3 0 Do not use steam tables (default)