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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
The vapor pressures were measured by means of a dynamic method with an ebulliometer. With this equipment, vapor pressures of pure components can be experimentally determined in a temperature range from approx. 250 to 600 K and at pressures from about
1 mbar up to 1 bar. At a given pressure (regulated by an electronic pressure control), the boiling temperatures of a component are measured. Due to the volume of the equipment only small amounts of the substances (about 20 ml) are needed.
GLP compliance:
no
Type of method:
dynamic method
Specific details on test material used for the study:
Purity: 99.638%
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
0.22 mBar
Remarks on result:
other: based on the Antoine equation defined between 318.10 and 475.31K
Test no.:
#1
Temp.:
40 °C
Vapour pressure:
0.75 mBar
Remarks on result:
other: based on the Antoine equation defined between 318.10 and 475.31K

Tab. 1 Experimental vapor pressure data for 2,5,7,10-Tetraoxaundecane T (K)

T (K)

P experimental (kPa)

P calculated (kPa)

1 – (Pexp/Pcalc)

318.10

0.112

0.108

-3.39%

327.83

0.208

0.213

2.20%

335.33

0.341

0.347

1.53%

339.90

0.453

0.460

1.57%

348.32

0.768

0.756

-1.62%

357.47

1.26

1.25

-0.20%

366.18

1.96

1.97

0.20%

374.67

2.99

2.97

-0.60%

382.57

4.28

4.28

-0.01%

393.07

6.75

6.75

-0.05%

408.26

12.35

12.39

0.27%

420.66

19.68

19.53

-0.79%

427.38

24.71

24.66

-0.20%

439.10

36.22

36.26

0.10%

447.13

46.59

46.56

-0.07%

455.19

59.40

59.18

-0.36%

465.08

77.18

78.36

1.50%

468.18

85.23

85.31

0.09%

475.31

102.31

103.22

0.87%

Tab 2a: Antoine parameters in DDB format: Log(P Torr) = A – B/(C +T °C) A : 7.37886 B : 1769.13 C : 191.857  

Tab 2b: Antoine parameters in Aspen format: ln(P Torr) = A + B/(C +T °C) A : 16.9905 B : -4073.57 C : 191.857

Conclusions:
Vapor pressure of 2,5,7,10-Tetraoxaundecane (TOU) has been measured by means of a dynamic method with an ebulliometer at temperature range from 318.10 to 475.31K. Using the Antoine equation, the vapor pressures have been determined as 0.22 and 0.75 mbar at 25 and 40 °C, respectively.
Executive summary:

Vapor pressure of 2,5,7,10-Tetraoxaundecane (TOU) has been measured by means of a dynamic method with an ebulliometer at temperature range from 318.10 to 475.31K. Using the Antoine equation, the vapor pressures have been determined as 0.22 and 0.75 mbar at 25 and 40 °C, respectively.

Description of key information

Vapor pressure of 2,5,7,10-Tetraoxaundecane (TOU) has been measured according to OECD 104 by means of a dynamic method with an ebulliometer at temperature rnge from 318.10 to 475.31K. Using the Antoine equation, the vapor pressures have been determined as 0.22 and 0.75 mbar at 25 and 40 °C, respectively.

Key value for chemical safety assessment

Vapour pressure:
22 Pa
at the temperature of:
25 °C

Additional information