Sodium methanolate

Melting point / freezing point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

thermal analysis

Remarks:

differential scanning calorimetry & thermogravimetry

Atm. press.:

ca. 1 atm

Decomposition:

yes

Decomp. temp.:

350 - ca. 430 °C

Remarks on result:

other: no melting was observed before decomposition (according the visual check after heating)

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 low endothermic effect at 66 °C accompanied by a mass loss of 0.1 %. Beginning at 350 °C (up to 430 °C) the thermogravimetry showed a mass loss of 8.3 %.. Also beginning at about 350 °C the DSC showed a strong endothermic effect. The consistence of the black residues found in the crucibles after the experiment indicated, that no melting process had taken place before.

Conclusions:

Taking into account all results and observations described in the commentary field above, no melting was observed prior to decomposition of the substance in the region of 350 to 430 ° C. Because this decomposition process apparenty changes the identity of the substance, no melting or boiling point can be assigned to sodium methanolate. The residue of the decomposition process can assumed to be NaOH/Na2O and elementary carbon. The effects at about 60 °C evidently are relatively small and may be caused by the evaporation of minor amounts of humidity or recrystallisation effects.

Executive summary:

The substance decomposes above 350 °C before any melting and boiling processes take place.

The endothermic process at about 60 °C seems to be of minor importance.

Reference 2

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

(assumed)

Principles of method if other than guideline:

Method: no data

GLP compliance:

not specified

Type of method:

other: unknown

Melting / freezing pt.:

300 °C

Atm. press.:

ca. 1 atm

Reference 3

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

secondary literature

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

(assumed)

Deviations:

not specified

Principles of method if other than guideline:

Method: other: no data

GLP compliance:

not specified

Type of method:

other: unkown

Melting / freezing pt.:

> 300 °C

Decomposition:

yes

Decomp. temp.:

70 °C

Substance starts to decompose before melting.

Reference 4

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

(assumed)

GLP compliance:

not specified

Type of method:

other: unknown

Decomposition:

yes

Decomp. temp.:

> 126 °C

Reference 5

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

unknown

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Guideline:

other: unknown

Deviations:

no

Principles of method if other than guideline:

Method: no data

GLP compliance:

not specified

Type of method:

other: unknown

Melting / freezing pt.:

> 300 °C

Decomposition:

yes

Decomp. temp.:

127 °C

Description of key information

No melting of the substance was observed before decomposition. The substance decomposes above 350 °C.

Additional information

The endothermic process at about 60 °C seems to be of minor importance.