2,2'-butyliminodiethanol

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

unknown

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: scientifically well documented study

Qualifier:

no guideline followed

Principles of method if other than guideline:

Correlation of carefully collected P/T data points taken from vacuum distillation of the material at different absolute pressures.

GLP compliance:

not specified

Type of method:

distillation method

Boiling pt.:

ca. 283.6 °C

Atm. press.:

ca. 1 013.25 mBar

Table 1. Carefully collected P/T data point pairs at different absolute pressures for the vacuum distillation of pure BDEA (N-butyldiethanolamine). Column 1 is the observed BP. Column 2 is BP converted to the absolute (K) scale. Column 3 is the Absolute P of the distillation given in units of mbars. Column 4 is the natural log of the absolute pressure. Column 5 shows 1000/T(K), which is sometimes a more convenient unit than 1/T for use in the correlation. The fifth row is extrapolated from the data above it using the derived correlation equation (shown below).

 

Boiling T (^oC)	Boiling T (K)	Absolute P (mbar)	ln(P)	1000/T(K)
82	355.15	0.6	-0.5108	2.8157
143	416.15	11	2.3979	2.403
153	426.15	20	2.9957	2.3466
166	439.15	30	3.4012	2.2771
283.6	556.8	1013.25	6.9209	1.7961

 

The two-parameter correlation equation derived from the above data is shown below:

 

ln(P) = -7298/T + 20.030

 

r² = 0.9981

7298 x R =DH_vaporization= 60.7 kJ/mol

20.075 x R =DS_vaporization@ 1 mbar = 166.5 J/K-mol

R = universal gas constant = 8.31447 Joules/K-mol

Accurate Predicted Normal BP = 284 ^oC

DS_vaporization@ 1 Atmosphere = DH_vaporization/(normal BP) = 109 J/K-mol

1 atmosphere = 1013.25 mbar

Conclusions:

The boiling point of the substance N-butyldiethanolamine (CAS 102-79-4) amounts to 283.6 °C at 1030.25 mbar.

Executive summary:

The boiling point of N-butyldiethanolamine (BDEA, CAS 102 -79 -4) has been determined using correlation of carefully collected P/T data points taken from vacuum distillation at different absolute pressures (ESC, 2013). Four P/T data point pairs for the distillation of the substance have been measured. As final result, the boiling point amounts to 283.6 °C at 1030.25 mbar.

Description of key information

Boiling point_Vacuum distillation method: 283.6 °C (at 1030.25 mbar)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

283.6 °C

Additional information

Two experimental studies (ESC, 2013; Bertelo, 2009) as well as one peer-reviewed database entry (GESTIS, 2015) and on MSDS entry (Taminco, 2010) are available for this endpoint.

The boiling point of N-butyldiethanolamine (BDEA, CAS 102 -79 -4) has been determined using correlation of carefully collected P/T data points taken from vacuum distillation at different absolute pressures (ESC, 2013). Four P/T data point pairs for the distillation of the substance have been measured. As final result, the boiling point amounts to 283.6 °C at 1030.25 mbar which is considered as key information.

In another experiment, the boiling point of the substance has been sufficiently derived based on differential thermal analysis (DTA) in combination with thermal gravimetric analysis (Bertelo, 2009). The boiling point was derived resulting in 283 °C. Referring to the peer-reviewed database entry (GESTIS, 2015), a boiling point range of 268 - 272 °C is provided. According to information provided in the Material Safety Data Sheet (Taminco BVBA, 2010), the substance Butyldiethanolamine has a boiling point of 283 °C.