Benzeneacetic acid, α,4-dicyano-2,3,5,6-tetrafluoro-, ethyl ester, ion(1-), potassium

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:

2012-09-12

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

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

Qualifier:

equivalent or similar to guideline

Guideline:

other: TRAS 410

Deviations:

no

GLP compliance:

no

Test substance thermally stable:

no

Key result

Operating temp.:

>= 280 °C

Remarks on result:

other: 1. Step: Breaking of salt

Key result

Operating temp.:

>= 320 °C

Remarks on result:

other: 2. Step: Decarboxylation

Sublimation:

no

Transformation products:

not specified

Test substance stable to sunlight:

not determined

Test substance stable to metals / metal ions:

not determined

Examination of the thermal stability of the test article in a glass crucible under air shows a first exothermic process from 280 °C with an energy release of -300 J/g. Another exothermic process is detected from 320 °C with an energy release of -330 J/g.

The measurement in the gold crucible shows a first exothermic effect from 190 °C with an energy release of -20 J/g. The second exotherm follows from 270 °C with an energy of -350 J/g.

The temperature of safe handling T_exo is calculated according to TRAS 410 from the onset of exothermic decomposition in the DSC measurement minus a cutoff of 100 K, i.e. to T_exo = T_onset - 100 K = 180 ° C.

The estimation of the heat of the reaction of the salt break and the decarboxylation in the second stage shows that even with adiabatic reaction course (eg cooling failure) due to the adiabatic temperature increases of 20 K and 8 K is not expected to initiate a thermal decomposition in this stage.

Conclusions:

Examination of the thermal stability of the test article in a glass crucible under air shows a first exothermic process from 280 °C with an energy release of -300 J/g. Another exothermic process is detected from 320 °C with an energy release of -330 J/g.
The measurement in the gold crucible shows a first exothermic effect from 190 °C with an energy release of -20 J/g. The second exotherm follows from 270 °C with an energy of -350 J/g.

Executive summary:

The determination of the thermal stability of a substance is carried out by Difference Scanning Calorimetry (DSC).

Examination of the thermal stability of the test article in a glass crucible under air shows a first exothermic process from 280 °C with an energy release of -300 J/g. Another exothermic process is detected from 320 °C with an energy release of -330 J/g.

The measurement in the gold crucible shows a first exothermic effect from 190 °C with an energy release of -20 J/g. The second exotherm follows from 270 °C with an energy of -350 J/g.

The temperature of safe handling T_exois calculated according to TRAS 410 from the onset of exothermic decomposition in the DSC measurement minus a cutoff of 100 K, i.e. to T_exo= T_onset- 100 K = 180 ° C.

The estimation of the heat of the reaction of the salt break and the decarboxylation in the second stage shows that even with adiabatic reaction course (eg cooling failure) due to the adiabatic temperature increases of 20 K and 8 K is not expected to initiate a thermal decomposition in this stage.

Description of key information

The determination of the thermal stability of a substance is carried out by Difference Scanning Calorimetry (DSC).

Examination of the thermal stability of the test article in a glass crucible under air shows a first exothermic process from 280 °C with an energy release of -300 J/g. Another exothermic process is detected from 320 °C with an energy release of -330 J/g.

The measurement in the gold crucible shows a first exothermic effect from 190 °C with an energy release of -20 J/g. The second exotherm follows from 270 °C with an energy of -350 J/g.

The temperature of safe handling T_exois calculated according to TRAS 410 from the onset of exothermic decomposition in the DSC measurement minus a cutoff of 100 K, i.e. to T_exo= T_onset- 100 K = 180 ° C.

The estimation of the heat of the reaction of the salt break and the decarboxylation in the second stage shows that even with adiabatic reaction course (eg cooling failure) due to the adiabatic temperature increases of 20 K and 8 K is not expected to initiate a thermal decomposition in this stage.