StanMix

StanMix is based on the iPRSV equation of state. The iPRSV equation of state is an improved, by Stryjek-Vera modified, Peng-Robinson cubic equation of state. For mixtures the Wong-Sandler mixing rules are applied. It estimates vapor pressures accurately, the phase equilibrium correlation for mixtures is good, and the performance for thermodynamic conditions other than saturation and for other thermodynamic properties is satisfactory. Furthermore, this equation of state provides a good trade-off between simplicity of the model and accuracy, and the simplicity of the formulation positively affects computational speed. It is generally known that the liquid densities are not represented accurately by a CEoS. This applies also to the iPRSV model. In order to obtain a complete the thermodynamic model a third order polynomial function for the calculation of the ideal gas heat capacity was added.

StanMix is documented in the following references:

 

  1. T.P. van der Stelt, N.R. Nannan, P. Colonna, 2012. '' The iPRSV equation of state.'' Fluid Phase Equil., 330, pp. 24-35.
  2. R.A. Heidemann, A.M. Khalil, 1980. ''The calculation of critical points.'' AIChE J, 26 (5), pp. 769-779.
  3. M.L. Michelsen, 1980. ''Calculation of phase envelopes and critical points for multicomponent mixtures.'' Fluid Phase Equil., 4, pp. 1-10.
  4. M.L. Michelsen, 1985. ''Saturation point calculations.'' Fluid Phase Equil., 23, pp. 181-192.
  5. M.L. Michelsen, 1982a. "The isothermal flash problem. Part I. Stability analysis.'' Fluid Phase Equil., 9, pp. 1-19.
  6. M.L. Michelsen, 1982b. "The isothermal flash problem. Part II. Phase split calculation.'' Fluid Phase Equil., 9, pp. 21-40.
  7. M.L. Michelsen, J. Mollerup, 2007. "Thermodynamic Models: Fundamentals & Computational Aspects, Second edition." Tie-Line Publications

 

The StanMix components can be used as pure fluids or in a mixture. StanMix provides thermodynamic and transport properties for the fluids in Table 1. The listed FluidProp names (either short or long) must be used to specify the fluid name in the SetFluid method.

 

Table 1

FluidProp Name (short) FluidProp Name (long) Tc [°C] Pc [bar] MW [g/mol] Tmin[°C] Tmax[°C]
1-C4H10O
1-butanol
74.1200
289.83
44.13
-50.00
1226.85
1-C8018O
1-octanol
130.2279
411.65
28.60
0.00
400.00
1-C3H8O
1-propanol
60.0960
263.56
51.70
59.85
350.00
2-C4H10O
2-butanol
74.1200
289.90
44.23
-73.15
1226.85
2-C3H8O
2-propanol
60.0960
235.25
47.64
-75.00
350.00
C3H6O
acetone
58.0800
234.95
46.96
-94.95
1500.00
air
air
28.8501
-142.14
35.89
-209.15
350.00
NH3
ammonia
17.0305
132.45
112.98
-78.15
350.00
Ar
argon
39.9480
-122.29
48.98
-190.00
1226.85
C6H6
benzene
78.1140
289.01
48.98
5.85
350.00
C12H10
biphenyl
154.2100
496.00
31.21
19.85
350.00
C4H10
butane
58.1240
152.01
37.97
-91.15
400.00
C10H14
butylbenzene
134.2182
387.35
28.90
-87.85
1226.85
CO2
carbon dioxide
44.0100
31.06
73.82
-57.15
400.00
C6H12
cyclohexane
84.1620
280.49
40.75
6.85
400.00
D3
D3
84.1620
280.49
40.75
6.85
400.00
D4
D4
84.1620
280.49
40.75
6.85
400.00
D5
D5
84.1620
280.49
40.75
6.85
400.00
D6
D6
84.1620
280.49
40.75
6.85
400.00
CH3OCH3
dimethylether
46.0680
126.95
52.40
-141.50
700.00
C12H10O
diphenyl ether
170.2072
503.65
30.80
15.00
600.00
C12H26
dodecane
170.3348
295.61
24.86
-9.55
700.00
diethylbenzene
Dowtherm J
134.2200
383.00
28.55
0.00
400.00
C2H6
ethane
30.0700
29.28
48.80
-153.15
350.00
C2H5OH
ethanol
46.0690
240.77
61.48
-114.15
700.00
C8H10
ethylbenzene
106.1680
344.05
36.06
32.85
329.85
C2H6O2
ethylene glycol
62.0678
446.85
82.00
-13.00
1000.00
C5H4O2
furfural
96.1000
396.85
58.90
-50.00
160.00
C7H16
heptane
100.2019
267.05
27.40
-73.15
1226.85
C6F6
hexafluoro benzene
186.0000
243.52
33.38
0.00
400.00
C6H14
hexane
86.1780
234.15
30.12
-41.15
400.00
H2
hydrogen
2.0160
-229.55
20.47
-259.15
350.00
i-C4H10
isobutane
58.1240
135.05
36.50
-108.15
135.05
i-C5H12
isopentane
72.1510
187.25
33.90
-53.15
187.25
MD2M
MD2M
310.6900
326.25
11.79
-10.15
400.00
MD3M
MD3M
384.8430
355.25
9.96
2.85
400.00
MD4M
MD4M
458.9933
380.05
8.77
13.85
400.00
MD5M
MD5M
533.1500
398.65
7.63
21.85
400.00
MD6M
MD6M
607.3100
415.75
6.77
29.85
400.00
MDM
MDM
236.5315
290.94
14.15
-25.15
400.00
CH4
methane
16.0425
-82.59
45.99
-182.46
351.85
CH4O
methanol
32.0420
239.43
80.96
-85.00
700.00
MM
MM
162.3790
245.60
19.39
-45.15
400.00
C10H8
naphthalene
128.1740
475.20
40.51
86.85
249.85
N2
nitrogen
28.0130
-146.95
34.00
-209.15
350.00
C8H18
octane
114.2200
295.61
24.86
0.00
400.00
O2
oxygen
31.9990
-118.38
50.90
-217.15
350.00
C5H12
pentane
72.1510
196.55
33.68
-77.15
400.00
C6F12
PFCH
79.1645
217.20
32.32
-41.15
400.00
C7F14
PP2
350.0000
211.85
20.60
0.00
600.00
C10F18
PP5
462.0000
291.85
17.88
0.00
400.00
C3H8
propane
44.0970
96.67
42.50
-187.62
400.00
C8H10
p-xylene
106.1680
344.05
36.06
32.85
329.85
R113
R113
187.3800
214.15
34.10
-34.95
400.00
R114
R114
170.9400
145.75
32.70
-94.00
400.00
R116
R116
138.0120
19.85
30.18
-100.75
400.00
R12
R12
120.9140
111.85
40.70
-140.00
273.15
R125
R125
120.0200
66.25
36.31
-40.15
400.00
R134a
R134a
102.0300
101.06
40.56
-63.15
400.00
R14
R14
88.0050
-45.55
37.40
-183.15
400.00
R142b
R142b
100.4960
136.45
43.30
-130.15
136.45
R22
R22
86.4800
96.05
49.80
-73.15
400.00
R23
R23
70.0130
25.91
48.41
-163.15
400.00
R245fa
R245fa
134.0488
154.05
36.40
-73.15
226.85
R32
R32
52.0240
78.41
58.30
-124.15
78.41
silox 1
silox 1
75.5717
74.31
50.42
-40.15
78.41
silox 2
silox 2
75.5717
74.31
50.42
-40.15
78.41
silox 3
silox 3
75.5717
74.31
50.42
-40.15
78.41
C7H8
toluene
92.1410
318.65
41.06
12.85
399.85
C9H12
trimethylbenzene
120.1900
364.10
31.27
56.85
359.85
C4H6O2
vinyl acetate
86.0900
246.05
41.40
-73.15
1226.85
H2O
water
18.0150
374.14
220.90
0.00
750.00
xx
xxxxxx
16.0425
-82.59
45.99
-182.46
351.85
 
The predefined mixtures of StanMix are also available through this version of the FluidProp interface. These mixtures are listed in table 2. The listed FluidProp names (either short or long) must be used to specify the fluid name in the SetFluid method.

 

Table 2

FluidProp Name (short) FluidProp Name (long) Tc [°C] Pc [bar] MW [g/mol] Tmin[°C] Tmax[°C]
1-C3H8O/C6H14
1-propanol/hexane
73.1370
263.56
51.70
59.85
350.00
C3H6O/CH4O
acetone/methanol
45.0610
229.42
60.80
17.27
350.00
C3H6O/H2O
acetone/water
38.0475
274.75
97.19
24.57
750.00
NH3/H2O
ammonia/water
17.5235
356.74
244.95
-78.15
350.00
Ar/CH4
argon/methane
27.9952
-103.40
51.36
-176.31
351.85
C6H6/C6H12
benzene/cyclohexane
81.1380
277.18
44.03
10.74
350.00
C6H6/C6H12/C6H14
benzene/cyclohexane/hexane
83.1540
255.06
37.53
10.44
350.00
C6H6/C8H10
benzene/ethylbenzene
92.1410
322.26
43.90
57.07
329.85
C6H6/C6H14
benzene/hexane
82.1460
252.18
38.03
9.74
350.00
C6H6/C7H8
benzene/toluene
85.1275
304.99
45.42
19.53
350.00
C6H6/H2O
benzene/water
48.0645
235.41
82.87
19.53
350.00
C4H10/C6H14
butane/hexane
72.1510
202.92
37.01
-5.78
400.00
C4H10/C5H12
butane/pentane
65.1375
172.16
36.41
-62.56
400.00
C4H10/C5H12/C6H14
butane/pentane/hexane
70.7483
196.29
36.78
-12.93
400.00
CO2/1-C4H10O
carbon dioxide/1-butanol
59.0650
205.74
89.84
124.08
400.00
CO2/C6H6
carbon dioxide/benzene
61.0620
205.44
126.37
-126.91
400.00
CO2/C4H10
carbon dioxide/butane
51.0670
104.44
73.52
7.87
400.00
CO2/furfural
carbon dioxide/furfural
70.0549
271.37
64.26
9.45
160.00
CO2/C6H14
carbon dioxide/hexane
65.0940
173.24
85.93
-130.96
400.00
CO2/C5H12
carbon dioxide/pentane
58.0805
141.19
74.14
-13.37
400.00
CO2/C3H8
carbon dioxide/propane
44.0535
66.50
71.41
-31.57
400.00
CO2/C7H8
carbon dioxide/toluene
68.0755
238.54
126.02
-113.77
400.00
CO2/C4H6O2/2-C4H10O
carbon diox/vinyl ace/2-butanol
57.2510
196.53
130.48
115.77
400.00
D3/D4/D5/D6
D3/D4/D5/D6
333.6955
339.37
13.65
106.79
400.00
D4/D3
D4/D3
259.5410
300.33
15.27
76.66
400.00
D4/D5
D4/D5
333.6955
331.89
12.65
34.83
400.00
D4/D6
D4/D6
370.7725
351.03
12.06
56.37
400.00
D4/CP28
D4/CP28
241.3363
284.78
24.53
10.23
700.00
D4/PFCH
D4/PFCH
298.3325
245.35
22.79
93.43
400.00
D5/D3
D5/D3
296.6185
324.16
15.04
101.75
400.00
D5/D6
D5/D6
407.8500
361.14
10.73
22.46
400.00
D6/D3
D6/D3
333.6955
348.26
14.78
126.40
400.00
C2H5OH/H2O
ethanol/water
32.0420
287.27
120.47
25.53
350.00
C8H10/C7H8
ethylbenzene/toluene
99.1545
332.01
38.79
43.87
329.85
C7H16/C2H5OH
heptane/ethanol
73.1345
234.95
39.39
17.77
350.00
C6H14/C6H12
hexane/cyclohexane
85.1700
255.14
35.15
12.02
400.00
i-C4H10/i-C5H12
isobutane/isopentane
65.1375
164.40
36.32
-47.31
135.05
MD2M/MD3M
MD2M/MD3M
347.7665
343.78
11.07
28.55
400.00
MD2M/MD4M
MD2M/MD4M
384.8450
361.33
10.81
53.32
400.00
MD2M/MD5M
MD2M/MD5M
421.9200
382.49
10.80
85.69
400.00
MD2M/MD6M
MD2M/MD6M
459.0000
402.30
10.84
109.07
420.00
MD2M/PP2
MD2M/PP2
330.3713
280.78
18.52
78.01
400.00
MD3M/MD4M
MD3M/MD4M
421.9215
368.61
9.44
40.48
400.00
MD3M/MD5M
MD3M/MD5M
458.9965
384.69
9.19
61.50
400.00
MD3M/MD6M
MD3M/MD6M
496.0765
400.91
9.08
80.00
420.00
MD3M/PP2
MD3M/PP2
367.4478
308.26
18.82
109.25
400.00
MD4M/MD5M
MD4M/MD5M
496.0750
391.04
8.44
52.00
400.00
MD4M/MD6M
MD4M/MD6M
533.1550
404.45
8.05
65.61
420.00
MD4M/PP2
MD4M/PP2
404.5229
323.41
19.59
21.36
400.00
MD5M/MD6M
MD5M/MD6M
570.2300
408.56
7.25
58.15
420.00
MDM/MD2M
MDM/MD2M
273.6100
313.05
13.42
16.40
400.00
MDM/MD3M
MDM/MD3M
310.6865
337.55
13.16
49.38
400.00
MDM/MD4M
MDM/MD4M
347.7650
359.77
13.18
75.04
400.00
MDM/MD5M
MDM/MD5M
384.8400
386.41
13.37
113.65
400.00
MDM/MD6M
MDM/MD6M
421.9200
410.11
13.50
138.61
420.00
MDM/PP2
MDM/PP2
293.2920
244.53
18.17
13.59
400.00
CH4/CO2
methane/carbon dioxide
30.0262
-22.82
75.86
-22.41
351.85
CH4O/C6H6
methanol/benzene
55.0780
240.27
64.12
11.21
350.00
CH4O/C7H8
methanol/toluene
62.0915
259.11
66.12
25.01
350.00
CH4O/H2O
methanol/water
25.0285
294.71
139.76
28.36
350.00
MM/PP2
MM/PP2
256.2158
213.71
19.13
4.58
400.00
MM/CP28
MM/CP28
174.2168
236.99
25.05
3.05
400.00
MM/D3
MM/D3
192.4215
-8888.80
-8888.80
3.05
400.00
MM/MD2M
MM/MD2M
236.5345
307.67
17.45
45.60
400.00
MM/MD3M
MM/MD3M
273.6110
340.19
17.63
86.97
400.00
MM/MD4M
MM/MD4M
310.6895
367.64
17.83
121.07
400.00
MM/MD5M
MM/MD5M
347.7645
400.43
18.11
152.88
400.00
MM/MD6M
MM/MD6M
384.8445
428.58
18.30
180.39
420.00
MM/MDM
MM/MDM
199.4545
275.45
17.59
-0.14
400.00
MM/MDM/MD2M
MM/MDM/MD2M
199.4554
279.64
18.54
27.25
400.00
MM/MDM/MD3M
MM/MDM/MD3M
251.3635
322.70
17.88
68.94
400.00
MM/MDM/MD4M
MM/MDM/MD4M
273.6106
344.01
18.96
108.97
400.00
MM/MDM/MD2M/MD3M
MM/MDM/MD2M/MD3M
236.5329
307.81
17.47
64.06
400.00
MM/MDM/MD2M/MD3M/MD4M/MD5M/MD6M
MM/MDM/MD2M/MD3M/MD4M/MD5M/MD6M
373.7198
381.54
13.76
136.02
420.00
N2/O2
nitrogen/oxygen
28.8102
-141.35
37.38
-207.02
350.00
C5H12/C6H14
pentane/hexane
79.1645
218.37
32.54
-29.51
400.00
C3H8/C4H10
propane/butane
51.1070
128.43
42.02
-73.54
400.00
C3H8/C5H12
propane/pentane
58.1205
153.15
43.08
-31.83
400.00
c8H10/c6H14
p-xylene/hexane
96.1725
289.76
33.93
61.10
329.85
R113/C2H5OH
R113/ethanol
116.7245
-8888.80
-8888.80
-34.95
400.00
R114/C2H5OH
R114/ethanol
108.5045
121.02
46.57
60.53
350.00
R125/R134a
R125/R134a
111.0250
83.38
38.70
-41.28
101.06
R134a/R116
R134a/R116
120.0210
49.77
27.49
-36.92
101.06
R134a/R142b
R134a/R142b
101.2630
117.05
42.43
-60.25
101.06
R14/R23
R14/R23
79.0090
-26.51
47.42
-136.76
400.00
R32/R125
R32/R125
72.5853
74.44
52.60
-40.95
78.41
R32/R134a
R32/R134a
77.0270
90.91
50.03
-59.91
78.41
R407a
R407A
90.1095
80.43
44.50
-41.38
78.41
R410a
R410A
72.5853
72.60
50.38
-40.84
78.41
R410b
R410B
75.5717
72.04
49.39
-40.85
78.41
H2O/2-C3H8O
water/2-propanol
34.8474
275.20
119.37
52.00
350.00
H2O/2-C4H10O
water/2-butanol
46.0700
269.03
72.07
17.14
750.00