The name is absent



substance

[g/moɪ]

m

σ
[Â]

e∕k
[K]

AAD%

T range
[K]

pvap

Pliq

propane

44.096

2.0000

3.6189

209.56

0.37

0.68

85 - 523

butane

58.123

2.3327

3.7019

224.65

0.9

0.74

135 -573

pentane

72.146

2.6900

3.7699

232.49

1.24

0.32

143 - 569

hexane

86.177

2.9938

3.8441

240.76

0.38

0.29

177 - 503

heptane

100.203

3.2943

3.8998

247.26

1.5

0.69

182 - 623

octane

114.231

3.6437

3.9321

249.92

0.77

0.47

216 - 569

nonane

128.25

3.9737

3.9662

252.7

0.54

0.3

219 - 595

decane

142.85

4.3002

3.9936

254.92

0.76

1.94

243 - 617

undecane

156.312

4.6019

4.034

257.66

1.32

0.52

247 - 639

dodecane

170.338

4.9021

4.0627

259.82

0.84

0.47

263 - 658

tridecane

184.365

5.2460

4.0872

260.38

1.11

1.028

267 - 675

tetradecane

198.392

5.4831

4.1254

263.83

2.13

0.86

279 - 693

pentadecane

212.419

5.7745

4.1418

265.31

2.21

0.69

283 - 708

hexadecane

226.446

6.1259

4.1459

265.02

1.24

1.48

291 - 723

heptadecane

240.473

6.4177

4.1598

266.34

1.81

1.85

295 - 736

octadecane

254.5

6.6492

4.1832

268.52

1.82

1.31

301 - 747

nonadecane

268.527

6.9544

4.2025

268.97

1.73

1.46

305 - 758

eicosane

282.553

7.4000

4.2103

267.05

3.57

1.57

309 - 775

Table 2.2: Pure component parameters for n-alkane series. The data used for parameter
regression were the same as in Gross and Sadowski [48].

Figures 2.5 a and b compare the critical temperatures and pressures for the n-
alkane series from n-C3 to n-C20, predicted from the new EOS and PC-SAFT with
the experimental critical constants. While both equations of state over-predict the
critical temperature and pressure, the critical constants predicted by the new EOS
are in better agreement with the experimental data, especially for longer n-alkanes.
The improvement of density predictions over PC-SAFT in the critical region is also
illustrated in figure 2.4. Like other classical equations of state, the new EOS can-
not describe accurately the singular asymptotic behavior of fluids, which is marked
by long-range density fluctuations. Several methodologies for incorporating critical
scaling into different versions of SAFT have been recently proposed [86, 87] in order

49



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