Alcohols, C20-22, reaction products with phosphorus oxide (P2O5)

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 September 2019 to 14 November 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

OECD Guideline No. 103 (1995)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Other quality assurance:

ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL:
- Source and lot/batch number of test material:Batch N°: 90604011722
- Manufacturing date: 04 June 2019
- Expiration date of the lot/batch: 03 June 2022
- Identification number of the test item: 19-151
- Appearance: White solid
- Purity test date:14 June 2019

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: The test item was stored in darkness at room temperature

Key result

Boiling pt.:

ca. 292.4 °C

Atm. press.:

ca. 101.325 kPa

Decomposition:

no

Conclusions:

The mean corrected boiling point of the test item was 292.4 °C ± 0.5 °C.

Executive summary:

In compliance with Regulation (EC) No. 1907/2006, Council Regulation (EC) No. 440/2008 A.2. method (2008) and OECD Guideline No. 103 (1995):

Test objective:

The objective of the test is to determine the boiling point that corresponds to the temperature at which the vapour pressure of the liquid is equal to 101.325 kPa, the normal atmospheric pressure. The test item is heated within a nitrogen atmosphere at the atmospheric pressure using the Differential Scanning Calorimetry method (DSC).

The test item sample and reference material are both kept at the temperature
predetermined by the program even during a thermal event in the sample. The amount of energy which has to be supplied to the sample to maintain a zero temperature differential between the test item sample and the reference material is the experimental parameter displayed as the ordinate of the thermal analysis curve. The rate of energy absorption by the sample is proportional to the specific heat of the sample.

Any transition accompanied by a change in specific heat produces a discontinuity in the power signal. Boiling of the test item is characterised by an endothermic enthalpy change that gives a peak whose area is proportional to the total enthalpy change whereas decomposition is characterised by an exothermic peak.
The boiling temperature depends on the atmospheric pressure, so boiling temperature is corrected if necessary.

Expression of the results:

Several heating procedures were performed until two values were in the range of the estimated accuracy of the method: ± 0.5°C up to 326.9°C and ± 2.0°C above 326.9°C.

The boiling point was calculated automatically by the Setsoft program by curve integration of the curves obtained: “Heat flow as a function of the temperature”.

At small deviations from the normal pressure (maximum ± 5 kPa), the boiling temperature was corrected to the standard pressure (101.325 kPa), according to the following equation by Sidney Young:
                                      Tn = T + (fT x Δp)
where:

Tn is the corrected temperature in °C.
T is the observed temperature in °C.
f_T is the rate of change of boiling temperature with pressure in °C/kPa.
Δp is 101.325 – actual pressure in kPa.

Temperature (°C)	50	75	100	125	150	175	200	225	250	275	300
fT (°C/kPa)	0.26	0.28	0.31	0.33	0.35	0.37	0.39	0.41	0.44	0.45	0.47

Results: 

Four assays were performed during the test and two of these assays complied with the accuracy criterion.

The observed boiling point of the two assays complied was 290.8 °C. The boiling point corrected to the atmospheric pressure was 292.4 °C.

Conclusion:

The mean corrected boiling point of the test item was 292.4 °C ± 0.5 °C.

Description of key information

The melting point was determined using the OECD Guideline 103 (Boiling point)

It was determined using the Differential Scanning Calorimetry method (DSC).

The boiling point of this UVCB substance was determined as 292.4°C ± 0.5 °C.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

292.4 °C