Benzenecarboximidamide, 4-amino-N-hydroxy-

Stability: thermal, sunlight, metals

Administrative data

Endpoint:

stability: thermal, sunlight, metals, other

Remarks:

Migrated from section 'Stability: thermal, sunlight, metals'

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2008

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

4-amino-N-hydroxybenzene-1-carboximidamide

EC Number:

664-406-5

Cas Number:

277319-62-7

Molecular formula:

C7 H9 N3 O

IUPAC Name:

4-amino-N-hydroxybenzene-1-carboximidamide

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Results and discussion

For thermal stability study

Test substance thermally stable:

no

Operating temperature

Operating temperature 1

Operating temp.:

>= 160 - <= 180 °C

Remarks on result:

other: Decomposition temperature. The decomposition energy is -580 J/g

Operating temperature 2

Operating temp.:

90 °C

Remarks on result:

other: SADT (50 kg container)

Sublimation:

no

Transformation products:

not measured

For study on stability to sunlight

Test substance stable to sunlight:

not determined

For study on stability to metals

Test substance stable to metals / metal ions:

not determined

Any other information on results incl. tables

The differential thermal analysis in a closed glass crucible shows an exothermic decomposition. The exothermic decomposition is observed in the temperature range of 160-180 ° C with a decomposition energy of -580 J / g. To check the influence of air on the thermal stability, the measurement was repeated with the same heating rate in an open crucible under 20 bar air pressure. Above 160 ° C a multi-stage exothermic reaction takes place. The starting point of the decomposition in the open cup is comparable with the one in the closed cup test. Due to the much larger energy release it can not be clearly deduced from this experiment, if an oxidation reaction is immediately followed by the thermal decomposition or if the oxidation reaction is superimposed by the thermal decomposition. From about 430° C on, the decomposition products are oxidized. After the measurement, 41% of the sample were volatilized.

The AZT24 was determined to be 95 ° C. The activation energy is 200 kJ / mol. The maximum gas release rate was about 300 l/kg/min, the maximum pressure rise rate of 40 bar/min.

Based on the reaction kinetics adapted the SADT of the product has been determined analogously to the procedure of the test H.2. The SADT is the Self Accelerating Decomposition Temperature, i.e. the ambient temperature at which just compensate for the natural heat loss of the bag, the heat production from the incipient decomposition. The SADT is found to be 90 °C for a 50-kg container.

Applicant's summary and conclusion

Conclusions:

The substance is thermally unstable at elevated temperatures. Because of this further tests to deduce safe handling conditions were conducted (see auto flammability).