Aspen Physical Property System - Physical Property Models

Parameter
Name/
Element
Symbol Default MDS Lower
Limit
2 Thermodynamic Property Models 133
Upper
Limit
Units Comment
NRTLXY r I,m — — — — — Binary,
symmetric
FHSIZE/1 s I 1.0 — 1E-15 1E15 — Unary
FHSIZE/2 � I
Option codes
1.0 — -1E10 1E10 — Unary
The Flory-Huggins term is included by default in the NRTLSAC model. You can
remove this term using the first option code. The table below lists the values
for this option code.
0 Flory-Huggins term included (default)
Others Flory-Huggins term removed
NRTLSAC molecular parameters for common solvents
The molecular parameters are identified for 62 solvents and published.
Solvent name r I,x r I,y- r I,y+ r I,z
ACETIC-ACID 0.045 0.164 0.157 0.217
ACETONE 0.131 0.109 0.513
ACETONITRILE 0.018 0.131 0.883
ANISOLE 0.722
BENZENE 0.607 0.190
1-BUTANOL 0.414 0.007 0.485
2-BUTANOL 0.335 0.082 0.355
N-BUTYL-ACETATE 0.317 0.030 0.330
METHYL-TERT-BUTYL-ETHER 1.040 0.219 0.172
CARBON-TETRACHLORIDE 0.718 0.141
CHLOROBENZENE 0.710 0.424
CHLOROFORM 0.278 0.039
CUMENE 1.208 0.541
CYCLOHEXANE 0.892
1,2-DICHLOROETHANE 0.394 0.691
1,1-DICHLOROETHYLENE 0.529 0.208
1,2-DICHLOROETHYLENE 0.188 0.832
DICHLOROMETHANE 0.321 1.262
1,2-DIMETHOXYETHANE 0.081 0.194 0.858
N,N-DIMETHYLACETAMIDE 0.067 0.030 0.157
N,N-DIMETHYLFORMAMIDE 0.073 0.564 0.372
DIMETHYL-SULFOXIDE 0.532 2.890
1,4-DIOXANE 0.154 0.086 0.401
ETHANOL 0.256 0.081 0.507