Registration Dossier

Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1985
Report date:
1985

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
no
Type of method:
dynamic method

Test material

Constituent 1
Chemical structure
Reference substance name:
Pivalic acid
EC Number:
200-922-5
EC Name:
Pivalic acid
Cas Number:
75-98-9
Molecular formula:
C5H10O2
IUPAC Name:
2,2-dimethylpropanoic acid
Test material form:
solid

Results and discussion

Vapour pressure
Temp.:
35.74 °C
Vapour pressure:
2 hPa
Vapour pressure at 50°C (if relevant for classification of gas under pressure)
Vapour pressure:
5.507 hPa
Remarks on result:
other: calculated from the regression equation.

Any other information on results incl. tables

Result

Temperature

[°C]

Vapour pressure

 (measurement)

[hPa]

Vapour pressure

 (calculation)

[hPa]

Aberration

[%]

35.74

2.00

2.01

0.5

41.11

3.00

2.98

-0.7

48.48

5.00

4.97

-0.5

53.64

7.00

6.99

-0.1

59.42

10.00

10.08

0.8

71.03

20.00

20.05

0.2

78.37

30.00

30.05

0.2

88.12

50.00

49.82

-0.4

95.20

70.00

70.42

0.6

102.55

100.0

99.15

-0.9

118.95

200.0

200.9

0.4

129.12

300.0

300.4

0.1

142.88

500.0

498.6

-0.3

152.61

700.0

696.1

-0.6

164.01

1001.2

1006

0.5

164.23

-

1013.25

-

The regression of the results leads to the following equation:

ln(p/hPa) = 11.3568 - 4114.45 / (198.48 + t/°C)

The vapour pressure at 50°C was calculated from the regression equation.

The vapor pressure at 20 ° C and 25 ° C could not be calculated because the melting point for the substance is 36 ° C and thus would lead on a change of state on the regression curve.

The normal boiling temperature was obtained by intrapolation/extrapolation from the vapour pressure curve.

Applicant's summary and conclusion