Measurement and correlation of the (vapor+liquid) equilibria of pure 4-ethylmorpholine, 1,2-dimethylisopropylamine and N,N-dimethylethanolamine, and their binary aqueous solutions

Vapor Pressure of 4-Ethylmorpholine Revisited: Thermodynamically Consistent Vapor Pressure Equation

“…Preliminary comparison of vapor pressures of 4-ethylmorpholine: (a) ln p as a function of 1/ T representation, (b) arc representation . Blue solid square, this work; magenta circle, Verevkin; green open square, Chiali-Baba-Ahmed et al …”

“…4-Ethylmorpholine is a cyclic tertiary amine used in a wide range of transformations, including acylations and metal-mediated couplings, and applications as solvents or catalysts in the polyurethane industry. The vapor pressure data for 4-ethylmorpholine published in 2013 by Chiali-Baba-Ahmed et al are in significant disagreement with those published in 1998 by Verevkin . Both groups , have a long tradition in vapor pressure measurements and typically report vapor pressure data of comparable uncertainty (based on our experience with the data of the authors when developing recommended vapor pressure data, see e.g., ref ) and therefore no clear assessment on the quality of published vapor pressure data could have been carried out based on the previous records or experience.…”

“…The vapor pressure data for 4-ethylmorpholine published in 2013 by Chiali-Baba-Ahmed et al are in significant disagreement with those published in 1998 by Verevkin . Both groups , have a long tradition in vapor pressure measurements and typically report vapor pressure data of comparable uncertainty (based on our experience with the data of the authors when developing recommended vapor pressure data, see e.g., ref ) and therefore no clear assessment on the quality of published vapor pressure data could have been carried out based on the previous records or experience. Because of the lack of data on calorimetrically determined vaporization enthalpies or vaporization heat capacities, thermodynamic consistency tests of vapor pressures , could not have been applied either.…”

“…Both groups , have a long tradition in vapor pressure measurements and typically report vapor pressure data of comparable uncertainty (based on our experience with the data of the authors when developing recommended vapor pressure data, see e.g., ref ) and therefore no clear assessment on the quality of published vapor pressure data could have been carried out based on the previous records or experience. Because of the lack of data on calorimetrically determined vaporization enthalpies or vaporization heat capacities, thermodynamic consistency tests of vapor pressures , could not have been applied either. Therefore, in order to reveal which of the two data sets is in error, new measurements of vapor pressure and liquid-phase heat capacities were performed in this work using the static method and Tian–Calvet calorimetry, respectively.…”

Prediction of thermodynamic properties: centerpiece approach—how do we avoid confusion and get reliable results?

“…Another important factor for the selection of the "centerpiece" molecule is illustrated in Fig. [26] of 2-(dimethyl-amino)ethanol as the "centerpiece" molecule. In both cases, we just need to replace the CH 2 group with the CH group and add the contribution for the CH 3 group as it is shown in Fig.…”