Bis(hydroxyethyl) terephthalate

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Experimental start date 29th June 2021. Experimental completion date 12 July 2021.

Reliability:

1 (reliable without restriction)

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

Name BHET
Batch no. AWS0274J
CAS no. 959-26-2
Composition Bis-2-Hydroxy Ethyl Terephthalate (BHET) ~94 wt%;
BHET dimer ~5 wt%; Mono 2-Hydroxy Ethyl
Terephthalate (MHET) <1.0 wt%; 2-Hydroxy Ethyl 2-
(2-Hydroxy Ethoxy)Ethyl Terephthalate <0.5 wt%; Bis-
2-Hydroxy Ethyl Isophthalate (BHEI) <0.1 wt%;
Ethylene Glycol <1.0 wt%; Water <0.2 wt%
Storage room temperature (20 ± 5 °C)
Expiry date 04. Feb. 2023
Stability stable under storage conditions
Appearance White solid
Purity ~95 %
Homogeneity homogeneous
Production date 15. Dec. 2020
EC no. 213-497-6
Molecular formula C12H14O6
Molecular weight 254.24 g/mol
Vapour pressure not stated
Solubility in solvents H2O: > 1 g/L; EtOH: not stated; acetone: not stated;
CH3CN: not stated; DMSO: not stated;
Stability in solvents H2O: not stated; EtOH: unknown; acetone: unknown;
CH3CN: unknown; DMSO: unknown

Boiling pt.:

> 237.04 - < 335.7 °C

Atm. press.:

1 013 hPa

Beginning boiling point	in °C (Event marker)	in K
1. Determination	237.04	510.19
2. Determination	238.69	511.84
3. Determination	237.16	510.31
4. Determination	237.85	511.00
MIN	237.04	510.19
Peak max	in °C	in K
1. Determination	279.48	552.63
2. Determination	279.00	552.15
3. Determination	268.09	541.24
4. Determination	285.66	558.81
MAX	285.66	558.81
End Boiling Point	in °C (Event marker)	in K
1. Determination	not completely detected
2. Determination	335.70	608.85
3. Determination	335.56	608.71
4. Determination	334.09	607.24
MAX	335.70	608.85

 

Conclusions:

The boiling point is given in a range from:
237.04 °C to 335.70 °C (510.19 K to 608.85 K) with the highest maximum of 285.56 °C (558.81 K)

Executive summary:

Introduction.

The study to determine the boiling point of the test substance was conducted in accordance with the following guidelines:-

OECD Guideline for the Testing of Chemicals No. 103 “Boiling Point“, dated 27. Jul.1995
Commission Regulation (EC) No 440/2008 of 30 May 2008, published on 31. May
2008, EU-Method A.2, “Boiling Temperature“

Method

The crucible containing the test item was heated under inert gas from 25 °C to 300°C for the first determination and from 25 °C to 350 °C for the further determinations using a heating rate of 10 K/min. As reference an empty crucible of the same kind was used. The heat flow
and temperature were recorded by the DSC during the test. After the test the appearance of the test item was inspected for visual changes and the mass of the crucible was recorded. Four determinations were performed.

Discussion and Results 

Four measurements were carried out via DSC. In all 4 measurements a sharp and a flat endothermic event were detected. According to the pre-tests, the first endothermic event can be identified as the melting point (evaluated with the onset function). A flat endothermic event in the further course can be assigned as boiling point. This was evaluated with the onset function and additionally with the event marker for beginning and end. The melting point is indicated in the range of Onset and the boiling point is also indicated in the range of beginning and end with highest peak maximum.

Conclusion 

The boiling point is given in a range from:
237.04 °C to 335.70 °C (510.19 K to 608.85 K)
with the highest maximum of 285.56 °C (558.81 K)
No observations were made which might cause doubts on the validity of the study outcome. Therefore, the result of the study is considered valid.

Description of key information

The boiling point assessment indicated a range from 237.04 °C to 335.70 °C at 1013 hPa.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

237 °C