Dampf/Flüssigkeit‐Gleichgewichte (Siedediagramme) binärer Systeme hoher relativer Flüchtigkeit. Wasser/N‐Methylacetamid, Wasser/N‐Methylformamid und N‐Methylformamid/N‐Methylacetamid

Abstract

Herrn Prof. Dr. G.-M. Schwab danken wir fur sein Interesse an unserer Arbeit, die finanziell von der Deutschen Forschungsgemeinschaft und vom Fonds der Chemischen Industrie unterstutzt wurde. Der Stiftung Volkswagenwerk sind wir fiir die Uberlassung des Spektralphotometers zu Dank verpflichtet. Fiir wertvolle Diskussionen sei Herrn Dr. 0. Vierle, Institut fur Physikalische Chemie und Elektrochemie der TH Munchcn, gedankt.

Further Development of Modified UNIFAC (Dortmund): Revision and Extension 5

“…In Figure , experimental activity coefficients at infinite dilution for four alkanes and excess enthalpy data for benzene at three different temperatures are shown, together with the calculated data using Modified UNIFAC (Dortmund) for binary systems that contain N -methylformamide.

3 Phase equilibria for systems that contain N -methylformamide: (A) activity coefficients at infinite dilution of different n -alkanes in N -methylformamide (Experimental values taken from refs −18; the solid line represents the calculation with Modified UNIFAC (Dortmund)) and (B) enthalpies of mixing at different temperatures for benzene (1) and N -methylformamide (2) (experimental values taken from refs and ; the solid line represents the calculation with Modified UNIFAC (Dortmund)).

4 Phase equilibria for systems that contain N -methylformamide−water: (A) solid−liquid equilibrium (SLE) of N -methylformamide (1) with water (2) (experimental values taken from ref ; the solid line represents the calculation with Modified UNIFAC (Dortmund)) and (B) vapor−liquid equilibria (VLE) data at different pressures for water (1) and N -methylformamide (2) (experimental values taken from refs and ; the solid line represents the calculation with Modified UNIFAC (Dortmund)).

…”

“…Phase equilibria for systems that contain N -methylformamide−water: (A) solid−liquid equilibrium (SLE) of N -methylformamide (1) with water (2) (experimental values taken from ref ; the solid line represents the calculation with Modified UNIFAC (Dortmund)) and (B) vapor−liquid equilibria (VLE) data at different pressures for water (1) and N -methylformamide (2) (experimental values taken from refs and ; the solid line represents the calculation with Modified UNIFAC (Dortmund)).…”

Thermodynamic Study of N-Methylformamide and N,N-Dimethyl-Formamide

“…For NMF, only two datasets passed thermodynamic tests, with the vapor pressures obtained in this work using the static method proving thermodynamically consistent along with ebulliometric data by Heinrich et al [ 13 ]. Other literature vapor pressure data were either thermodynamically inconsistent with related thermal data [ 26 , 31 ] or exhibited significantly larger scatter than other data available in the same temperature range [ 23 , 25 ].…”

“…While DMF is thermally stable even at elevated temperatures, thermal stability of NMF at higher temperatures (and especially in presence of water traces) represent a well-known issue [ 13 ]. Moreover, NMF is rather hygroscopic [ 23 ]. This instability might affect the measured quantities published in the literature (for example, scatter of published vapor pressures is unusually high) as well as values in this work.…”

“…Datasets used in the SimCor method ( Section 2.6 ) are denoted by filled symbols: magenta , this work; green , Heinrich et al [ 13 ]; green , Shealy and Sandler [ 39 ]; cyan , Blanco et al [ 43 ]; dark green , Wang et al [ 44 ]; red , Muñoz et al [ 45 ]. Other datasets: cyan , Kortüm and Biedersee [ 23 ]; black , Messow et al [ 25 ]; blue , Ushakov et al [ 26 ]; orange , Zielkiewicz [ 27 , 28 , 29 ]; violet , Harris et al [ 30 ]; brown , Chen et al [ 31 ]; red , Li et al [ 32 ]; grey , Ivanova and Geller [ 33 ]; blue , Gopal et al [ 34 ]; black , Quitzsch et al [ 35 ]; dark green , Myasnikova et al [ 36 ] (partially displayed); olive , Bludilina et al [ 37 ]; red , Agarwal and Bapat [ 38 ]; olive , Wilding et al [ 40 ]; red , Polishchuk et al [ 41 ]; red , Marzal et al [ 42 ]; green , Cui et al [ 46 ]; blue , Zaitseva et al [ 17 ]; red , data obtained by SimCor method.…”