3-(methylthio)propionaldehyde

Stability: thermal, sunlight, metals

Link to relevant study record(s)

Reference

Endpoint:

thermal stability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

12.12.1995 to 28.02.1996

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Principles of method if other than guideline:

In a hot storage test, the test substance was heated in an air tempered autoclave. Stability assessment based on the results was performed.

GLP compliance:

not specified

Test substance thermally stable:

no

Key result

Operating temp.:

20 - 247 °C

Operating temp.:

20 - 87 °C

Sublimation:

no

Transformation products:

not measured

Test substance stable to sunlight:

not determined

Test substance stable to metals / metal ions:

not determined

Test I:

The test item ANT-A (MMP Rein; MMP pure) was heated from 20 °C to 247 °C. After ca. 27 days the test was stopped. At 30 °C and above strong exothermal behaviour was observed. At 215 °C the test dewar was destroyed. Maximal pressure of 21000 hPa (21 bar) and maximal increase in pressure of 1.4 hPa/sec (1.4 * 10-3 bar/sec) was observed at 215°C (burst of the dewar).

Test II: 

The test item ANT-B (MMP Roh; MMP raw) was heated from 20 °C to 110 °C. After ca. 30 days the test was stopped. The reason was a defect of the heating device in the testing apparatus. Therefore the evaluable range of the sample temperature curve endet at 87 °C. At 30 °C and above strong exothermal behaviour was observed. At 87° C a pressure of 9,000 hPa (9 bar) was observed.

 

Stability assessment:

Based on the results a stability assessment of the following scenario was performed:

The heat dissipation curve for a 17,500 L tank with heat dissipation half life of t1/2 = 60 h and environmental temperatures of 20, 30 40, 50, and 60 °C the heat production rate of both, MMP Rein (ANT-A) and MMP Roh (ANT-B), was calculated. Up to 60 °C the storing conditions of MMP Rein (ANT-A) and MMP Roh (ANT-B) are stable, up to 90 °C the heat production curve of both MMP Rein and MMP Roh are beneath of the heat dissipation curve of the surrounding temperature.

Conclusions:

At 30 °C and above strong exothermal behaviour of MMP Rein (MMP pure) and MMP Roh (MMP raw) was observed. An stability assessment for a 17,500 L tank at environmental temperature of 60 °C and a heat dissipation half life of t1/2 = 60 h resulted in stable storage conditions up to 60 °C. At temperatures > 60 to 90 °C the heat production curves of both MMP Rein and MMP Roh are beneath of the heat dissipation curve.

Description of key information

MMP showed a strong exothermal behaviour above 30 °C in a hot storage test. The stability assessment demonstrated stable storage conditions up to 60 °C.

1:1 MMP/acrolein mixtures containing catalyst exhibited no exothermal behaviour at 13 °C - 119 °C.

Additional information

Although MMP showed a strong exothermal behaviour above 30 °C the stability assessment for a 17,500 L tank at environmental temperature of 60 °C and a heat dissipation half life of t1/2 = 60 h resulted in stable storage conditions up to 60 °C. Between 60 °C to 90 °C the heat production curve of MMP was beneath of the heat dissipation curve.