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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2012-07-18
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted in accordance with OECD 103 and in compliance with a known quality system (ISO 9001:2008)
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
GLP compliance:
no
Other quality assurance:
other: ISO 9001:2008
Type of method:
differential scanning calorimetry
Key result
Boiling pt.:
259.6 °C
Atm. press.:
1 013 hPa

Results:

Test

Measured boiling temperature

Measured pressure (kPa)

Boiling temperature corrected to normal pressure

 

°C

K

 

°C

K

1

257.7

530.9

96.8

259.7

532.9

2

257.5

530.7

96.8

259.5

532.7

Mean value

257.6

530.8

 

259.6

532.8

 

Approximate accuracy of the instrument:

 ± 0.5 K (up to 600 K)

± 2.0 K (up to 1273 K)

At small deviations from the normal pressure (max. ± 5 kPa) the boiling temperatures are normalised to Tn by means of the following number-value equation by Sidney Young:

Tn = T + (fT x p )

p = (101.325 – p)

where:

p = pressure measurement in kPa

fT = rate of change of boiling temperature with pressure in K / kPa (correction factor) = 0.44

T = measured boiling temperature in K

Tn = boiling temperature corrected to normal pressure in K

Conclusions:
A boiling point of 259.6°C at 1013 hPa was determined in a reliable study conducted according to OECD 102, the result is considered to be reliable.

Description of key information

Boiling point: 259.6°C (532.8 K) at 1013 hPa (OECD 103)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
259.6 °C

Additional information

A measured boiling point of 259.6°C (532.8 K) at 1013 hPa was determined for the substance using Differential Scanning Calorimetry (DSC) in accordance with OECD Test Guideline 103 and in compliance with a known quality system (ISO 9001:2008). The result is considered to be reliable and is selected as key study. A predicted boiling point value of 280°C at 1013 hPa was also obtained for the substance using a validated QSAR estimation method.

In available secondary sources to which reliability could not be assigned, boiling point values of 98°C at 2 mmHg, 250°C at 1013 hPa, 257°C at 1013 hPa and 265°C at 1013 hPa were reported for the substance.