2-propanol and 2-butanol production, distn. residues

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

19 August - 20 August 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Fully documented study run under GLP and according to international guidelines.

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

plate method

Surface tension:

>= 65 - <= 70 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Findings Main study

The test item solution was held at constant temperature (20.0 ±0.1 °C). After conclusion of the first measurement series, a second measurement series was performed for verification purposes.

The following values were recorded:

Table 1    Measured Values Test Item First Series

Measurement	Time	Mass	Surface Tension	Temperature
No	s	g	mN/m	°C
1	3	0.2698	65.82	19.9
2	6	0.2710	66.11	19.9
3	9	0.2706	66.01	19.9
4	12	0.2705	65.99	19.9
5	14.9	0.2704	65.96	19.9
6	18	0.2704	65.96	19.9
7	21	0.2703	65.94	19.9
8	24	0.2702	65.91	19.9
9	26.9	0.2707	66.04	19.9
10	30	0.2706	66.01	19.9
Mean			65.98
Standard Deviation			0.08

 

Table 2    Measured Values Test Item Second Series

Measurement	Time	Mass	Surface Tension	Temperature
No	s	g	mN/m	°C
1	2.9	0.2875	70.13	19.9
2	5.8	0.2870	70.01	19.9
3	8.9	0.2871	70.04	19.9
4	11.8	0.2870	70.01	19.9
5	14.9	0.2873	70.09	19.9
6	17.9	0.2873	70.09	19.9
7	20.9	0.2874	70.11	19.9
8	23.8	0.2872	70.06	19.9
9	26.9	0.2873	70.09	19.9
10	29.8	0.2875	70.13	20.0
Mean			70.08
Standard Deviation			0.04

 

Table 3    Measured Values Test Item Third Series

Measurement	Time	Mass	Surface Tension	Temperature
No	s	g	mN/m	°C
1	2.9	0.2769	67.55	19.9
2	5.8	0.2800	68.31	19.9
3	8.9	0.2797	68.23	19.9
4	11.8	0.2797	68.23	19.9
5	14.9	0.2798	68.26	19.9
6	17.8	0.2797	68.23	19.9
7	20.9	0.2801	68.33	20.0
8	23.9	0.2798	68.26	20.0
9	26.9	0.2797	68.23	20.0
10	29.9	0.2798	68.26	20.0
Mean			68.19
Standard Deviation			0.23

 

Over 120 minutes, no significant changes in the surface tension were detected.

Conclusions:

According to this study, reaction mass of 2,2'-oxybisbutane (DSBE), DIPE, SBA and 2-methylpropan-2-ol (TBA) was classified as not surface active.

Executive summary:

The surface tension of an aqueous solution of reaction mass of 2,2'-oxybisbutane (DSBE), DIPE, SBA and 2-methylpropan-2-ol (TBA) was determined according to OECD 115 resp. EU A.5 under GLP conditions.

The surface tension of an aqueous solution of the test item was determined as 65.98 ±0.08 mN/m at 19.9 °C. Two measurements were performed for verification (after 60 and 120 minutes). No significant changes and thus no significant dependence on time were observed.
As all measured values were higher than 60 mN/m, the reaction mass of 2,2'-oxybisbutane (DSBE), DIPE, SBA and 2-methylpropan-2-ol (TBA) was classified as not surface active.
The surface tension of the negative control (water HPLC grade) lay within the accepted range.

Description of key information

A series of 10 measurements was performed to determine the surface tension of the pure test item (density 0.7515 kg/L). Two further series of 10 measurements were performed for verification on the same sample after 60 and 120 minutes. The surface tension for the respective series of measurements were 65.98, 70.08 and 68.19 mN/m. No significant changes and thus no significant dependence on time and temperature were observed. The surface tension of the negative control lay within the accepted range. The surface tension of the test item is 65.98 mN/m. As all measured values were higher than 60 mN/m, the reaction mass of 2,2'-oxybisbutane (DSBE), DIPE, SBA and 2-methylpropan-2-ol (TBA) was classified as not surface active.

Key value for chemical safety assessment

Surface tension:

65.98

in mN/m at 20°C and concentration in mg/L:

1 000

Additional information

The surface tension of an aqueous solution of reaction mass of 2,2'-oxybisbutane (DSBE), DIPE, SBA and 2-methylpropan-2-ol (TBA) was determined according to OECD 115 resp. EU A.5 guidelines under GLP. The surface tension was measured to be 65.98 ±0.08 mN/m at 19.9 °C. Two measurements were performed for verification (after 60 and 120 minutes). No significant changes and thus no significant dependence on time were observed.
As all measured values were higher than 60 mN/m, the reaction mass of 2,2'-oxybisbutane (DSBE), DIPE, SBA and 2-methylpropan-2-ol (TBA) was classified as not surface active.
The surface tension of the negative control lay within the accepted range.