Bottom residues resulting from the synthesis of isoprene and isoamylene by dehydrogenation of isopentane

Boiling point

Administrative data

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

10. May to 08. August 2011

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study performed according to OECD guideline but not under GLP conditions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2011

Report date:

2011

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling point/boiling range)

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

GLP compliance:

no

Type of method:

differential scanning calorimetry

Test material

Test material information

Constituent 1

Reference substance name:

Absorbent N grade A

IUPAC Name:

Absorbent N grade A

Details on test material:

- Name of test material (as cited in study report): Absorbent N grade A
- Substance type: UVCB
- Physical state: Brown liquid
- Stability under test conditions: months
- Storage condition of test material: room temperature, in the dark

Results and discussion

Any other information on results incl. tables

Boiling Point / Boiling Range (DSC)

Eight measurements in aluminium crucibles with a hole showed broad endothermic signals:

The first measurement showed a broad endothermic effect in the temperature range 60 °C to 280 °C. Additionally there could be an endothermic effect even before the aforementioned one as a broad shoulder can be observed from approximately -80 °C to 60 °C.

The second measurement showed two endothermic effects in the temperature range -10 °C to 110 °C and 120 °C to 230 °C, respectively.

The third measurement showed an endothermic effect in the temperature range 20 °C to 110 °C.

The fourth measurement showed an endothermic effect in the temperature range 70 °C to 300 °C.

The fifth measurement showed an endothermic effect in the temperature range 25 °C to 275 °C.

The sixth measurement showed an endothermic effect in the temperature range 130 °C to 280 °C.

The seventh measurement showed an endothermic effect in the temperature range 20 °C to 170 °C. This effect is directly followed by another small endothermic effect in the temperature range 180 °C to 215 °C.

The eighth measurement showed an endothermic effect in the temperature range 140 °C to 280 °C.

Ident-No.	Test temperature range / °C	Temperature range of endothermic signal / °C	Crucible
31878	(-100) - 300	60 - 280	Aluminium with a hole
31879	(-100) - 300	(-10) - 110 120 - 230	Aluminium with a hole
31880	10 - 300	20 - 110	Aluminium with a hole
31881	(-20) - 500	70 - 300	Aluminium with a hole
32017	(-20) - 300	25 - 275	Aluminium with a hole
32016	(-20) - 300	130 - 280	Aluminium with a hole
32018	(-20) - 300	20 - 170 180 - 215	Aluminium with a hole
32022	(-20) - 300	140 – 280	Aluminium with a hole

 

According to the information from the sponsor the test item consists of a large number of different chemical substances. Furthermore due to the different temperature ranges of the endothermic effects it has to be assumed that the test item is heterogeneous. Therefore it is not possible to state a boiling point/range for this test item (due to the nature of the test item and the limited amount of test item used for the measurements).

The test item shows an endothermic effect in the temperature range -10 °C to 300 °C. Due to the test item consisting of a large number of substances and heterogeneous nature no boiling point/range can be given.

Applicant's summary and conclusion

Conclusions:

The test item shows an endothermic effect in the temperature range -10 °C to 300 °C. Due to the test item consisting of a large number of substances and heterogeneous nature no boiling point/range can be given.

Executive summary:

The test item shows an endothermic effect in the temperature range -10 °C to 300 °C. Due to the test item consisting of a large number of substances and heterogeneous nature no boiling point/range can be given.