Bottom residues resulting from dimethylformamide regenaration and separation of piperylene and benzene in the synthesis of isoprene from dehyrdogenation of isopentane

Boiling point

Administrative data

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22. June - 05. 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 B

IUPAC Name:

Absorbent N grade B

Details on test material:

- Name of test material (as cited in study report): Absorbent N grade B
- 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

Boiling point

Boiling pt.:

ca. 40 - ca. 340 °C

Atm. press.:

>= 1 013.3 hPa

Decomposition:

no

Any other information on results incl. tables

Boiling Point / Boiling Range (DSC)

Two measurements in aluminium crucibles with a hole showed broad endothermic signals. Due to the broad shape of the endothermic signals only temperature ranges but no defined onset temperatures can be derived. A correctionof the values to standard atmospheric pressure wasdeemed unnecessarybecause theatmospheric pressure during the tests was 1001 hPa and therefore the resulting correction is much smaller than the uncertainty that accompanies the evaluation of the broadendothermic signals.

The first measurement showed a broad endothermic effect in the temperature range 75 °C to 340 °C. Additionally a small endothermic effect was observed even before the aforementioned one in the temperature range from 40 °C to 75 °C.

The second measurement showed one endothermic effect in the temperature range 55 °C to 315 °C.

Ident-No.	Test temperature range  / °C	Temperature range of endothermic signal / °C	Crucible
31895	(-20) - 500	40 – 75 75 – 340	Aluminium with a hole
31896	(-20) - 350	55 - 315	Aluminium with a hole

 

According to the information from the sponsor the test item consists of a large number of different chemical substances. Some of these substances can be assumed as highly volatile. Due to the large variety of compounds involved it is not possible to give a more detailed result.

Due to large number of different chemical substances included in the test item the deviations of the measurements to each other are quite normal (especially since DSC-measurements only use a very small amount of the test item for each measurement).

 

The test item has a boiling range at atmospheric pressure (1013.3 hPa) ofapproximately 40 temperature to 340 °C.

Applicant's summary and conclusion

Conclusions:

The test item has a boiling range at atmospheric pressure (1013.3 hPa) of approximately 40 °C to 340 °C.

Executive summary:

The test item has a boiling range at atmospheric pressure (1013.3 hPa) of approximately 40 °C to 340 °C.