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Physical & Chemical properties

Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Principles of method if other than guideline:
determination of the vapour pressure by osmometer (water partial pressure)
GLP compliance:
no
Temp.:
25 °C
Vapour pressure:
0.021 Bar
Remarks on result:
other: 80% dry mass
Temp.:
25 °C
Vapour pressure:
0.024 Bar
Remarks on result:
other: 68% dry mass
Temp.:
25 °C
Vapour pressure:
0.026 Bar
Remarks on result:
other: 55% dry mass
Temp.:
25 °C
Vapour pressure:
0.028 Bar
Remarks on result:
other: 44% dry mass
Temp.:
25 °C
Vapour pressure:
0.029 Bar
Remarks on result:
other: 33% dry mass
Temp.:
25 °C
Vapour pressure:
0.03 Bar
Remarks on result:
other: 22% dry mass
Temp.:
25 °C
Vapour pressure:
0.031 Bar
Remarks on result:
other: 11% dry mass

Regression curves:

Vapour pressure [bar] as a function of concentration [% dry mass]:

30 °C:

y = -1E-06 x² - 7E-05 x + 0.0424

R² = 0.9995

50 °C:

y = -4E-06 x² - 0.0002 x + 0.123

R² = 0.9964

The fugacity coefficient of Venasse for the different concentrations were calculated by relating the measured vapour pressures to the vapour pressure of pure water. Provided that fugacity coefficients are constant for the whole temperature range the following vapour pressures were calculated:

Temperatur [°C]

vapour pressure [bar] for different concentrations dry matter

 0%

11%

22%

33%

44%

55%

68%

80%

25

0,032

0,031

0,030

0,029

0,028

0,026

0,024

0,021

30

0,042

0,041

0,040

0,039

0,037

0,035

0,032

0,028

35

0,056

0,055

0,054

0,051

0,049

0,046

0,042

0,037

40

0,074

0,072

0,070

0,067

0,064

0,060

0,055

0,049

45

0,096

0,093

0,091

0,087

0,083

0,078

0,071

0,063

50

0,123

0,120

0,117

0,113

0,107

0,101

0,092

0,081

55

0,157

0,153

0,150

0,144

0,137

0,128

0,117

0,104

60

0,199

0,194

0,190

0,182

0,173

0,162

0,148

0,132

65

0,250

0,243

0,238

0,228

0,217

0,204

0,186

0,165

70

0,312

0,303

0,297

0,284

0,271

0,254

0,232

0,206

75

0,386

0,375

0,367

0,352

0,335

0,314

0,287

0,255

80

0,474

0,461

0,451

0,432

0,412

0,386

0,352

0,313

85

0,578

0,562

0,550

0,527

0,502

0,471

0,430

0,382

90

0,701

0,682

0,668

0,640

0,609

0,572

0,521

0,463

95

0,845

0,822

0,805

0,771

0,735

0,689

0,628

0,558

100

1,013

0,986

0,965

0,925

0,881

0,826

0,753

0,669

105

1,208

1,175

1,151

1,102

1,050

0,985

0,898

0,798

110

1,433

1,393

1,365

1,307

1,245

1,168

1,065

0,946

115

1,691

1,644

1,610

1,543

1,469

1,378

1,257

1,116

120

1,985

1,931

1,891

1,812

1,725

1,619

1,476

1,311

Endpoint:
vapour pressure
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

not applicable

Key value for chemical safety assessment

Additional information

Vinasses are complex UVCBs of various constituents.

The vapour pressure of Vinasses, consisting of water and dry mass, solely reflects the water partial pressure.