Oxalonitrile

Boiling point

Administrative data

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

yes

Remarks:

Due to the fact that under normal conditions, ethanedinitrile is a gaseous substance, the recommended method (Method A.1 Melting/Freezing temperature, Annex to Regulation No 440/2008) is not applicable and it is necessary to use a modified procedure

Principles of method if other than guideline:

Due to the fact that under normal conditions, ethanedinitrile is a gaseous substance, the recommended method (Method A.1 Melting/Freezing temperature, Annex to Regulation No 440/2008) is not applicable and it is necessary to use a modified procedure which however is based on this document.
Ethanedinitrile from the sample container was slowly introduced into a glass container with the volume of approx. 10 ml, fitted with a temperature sensor (TTK-50, Anton Paar), cooled in a dry ice/acetone bath (-78 °C). After accumulating a sufficient amount of solid ethanedinitrile, the inlet was closed and the container was removed from the cooling bath and moved to a larger test tube to avoid condensation of air humidity on its external surface and to limit the speed of heat exchange (heating of the container). Temperature measured by means of sensor with an accuracy of 1 mK was recorded in time. The temperatures corresponding to the delay of transition from solid to liquid phase (melting) and from liquid to gaseous phase (evaporation, boiling) were then determined from the records. Simultaneously with the experiment, the value of absolute atmospheric pressure was measured by a mercury barometer.
The results were processed statistically; the obtained boiling point value was further corrected according to the following formula:
tb(std) = tb(act) + 0.037Δp
in which tb(std) is boiling point under standard pressure (101.325 kPa, 760 mmHg)
tb(act) is boiling point under actual pressure
Δp is difference between actual and standard pressure expressed in mm Hg.

GLP compliance:

no

Type of method:

differential thermal analysis

Test material

Test material information

Constituent 1

Reference substance name:

Oxalonitrile

EC Number:

207-306-5

EC Name:

Oxalonitrile

Cas Number:

460-19-5

Molecular formula:

C2N2

IUPAC Name:

carbononitridic cyanide

Test material form:

gas

Results and discussion

Boiling point

Key result

Boiling pt.:

>= -21.7 - <= -21.1 °C

Atm. press.:

101.3 kPa

Applicant's summary and conclusion

Conclusions:

Boiling point at atmospheric pressure is -21.4 ± 0.3°C.

Executive summary:

The data for determination of melting point was obtained experimentally.

Due to the fact that under normal conditions, ethanedinitrile is a gaseous substance, the recommended method (Method A.1 Melting/Freezing temperature, Annex to Regulation No 440/2008) is not applicable and it is necessary to use a modified procedure based on this document. Ethanedinitrile from the sample container was slowly introduced into a glass container with the volume of approx. 10 ml, fitted with a temperature sensor (TTK-50, Anton Paar), cooled in a dry ice/acetone bath (-78 °C). After accumulating a sufficient amount of solid ethanedinitrile, the inlet was closed and the container was removed from the cooling bath and moved to a larger test tube to avoid condensation of air humidity on its external surface and to limit the speed of heat exchange (heating of the container). Temperature measured by means of sensor with an accuracy of 1 mK was recorded in time. The temperatures corresponding to the delay of transition from solid to liquid phase (melting) and from liquid to gaseous phase (evaporation, boiling) were then determined from the records. Simultaneously with the experiment, the value of absolute atmospheric pressure was measured by a mercury barometer. The results were processed statistically; the obtained boiling point value was further corrected according to the following formula: tb(std) = tb(act) + 0.037Δp in which tb(std) is boiling point under standard pressure (101.325 kPa, 760 mmHg) tb(act) is boiling point under actual pressure Δp is difference between actual and standard pressure expressed in mm Hg.

Boiling point at atmospheric pressure is -21.4±0.3°C.