Potassium methanolate

Boiling point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling point/boiling range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Remarks:

additionally: thermogravimetry

Decomposition:

yes

Decomp. temp.:

384 - ca. 430 °C

Remarks on result:

other: the substance decomposes already in the melting range

Parallel to the DSC measurement the mass loss was determined with a thermo balance during temperature rising. The residues in the crucibles were visually examined after the DSC and thermogravimetric experiment.

There was a minor endothermic effect at about116 °C accompanied by a mass loss of 0.4 %. Beginning at 358 °C the first of two strong endothermic peaks appeared in the DSC. The first peak (with a maximum at 376 °C) overlapped with the second peak (with a maximum at 385 °C). Only the second peak of the DSC was accompanied by a mass loss, which could be detected by the thermo balance. The mass loss happened in the temperature range from 385 to about 430 °C.

The consistence of the black residues found in the crucibles after the experiment indicated, that a melting process had taken place before.

Conclusions:

The substance begins to melt at about 359 °C. At 385 °C an endothermic decomposition process sets in and superimposes the melting process. Therefore no boiling point can be assigned to the substance.

The effect at about 116 °C seems to be of minor importance.

Reference 2

Endpoint:

boiling point

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is a solid which melts above 300°C

the study does not need to be conducted because the substance is a solid which decomposes before boiling

Description of key information

No boiling point can be assigned to the substance. The substance melts above 300 °C and decomposes before boiling.

Additional information

The substance begins to melt at about 359 °C. This process is followed by an endothermic decomposition starting at 385 °C. Therefore no boiling point can be assigned to the substance.