Excess Molar Enthalpies of (Water + Alkanolamine) Systems and Some Thermodynamic Calculations

Abstract

We have made calorimetric measurements of enthalpies of mixing of (water + monoethanolamine), (water + diethanolamine), and (water + triethanolamine) at T ) 298.15 K and of (water + methyldiethanolamine) at T ) 298.15 and 313.15 K. Results of these measurements have been used in some thermodynamic calculations to illustrate general principles that are applicable to many systems of mixed liquids.

Excess properties of (alkyldiethanolamine +H2O) mixtures at temperatures from (298.15 to 338.15) K

“…The position of the minimum becomes more negative from (DEA + H 2 O) to the (MDEA + H 2 O) mixture, while it becomes less negative for the aqueous mixtures of the ethanolamines with bigger alkyl groups (from propyl to n-butyl group). This effect has been also reported in our earlier investigations (4,5) following equations: (4,12) …”

“…The enthalpies at infinite dilution for water could be obtained with a similar formula (4,12) but their variations are insignificant. (4,12) We will only discuss here the enthalpies of ethanolamines at infinite dilution in water.…”

“…Details of the measurements are given in the references. (12,14) Uncertainties for the molar excess enthalpies (H E ) are approximately 2 per cent over the whole range of composition. Actual temperatures of each measurement were within ±0.08 K of the stated temperatures.…”

“…(1,2) Densities, excess molar volumes, and excess molar enthalpies of (monoethanolamine, MEA, + H 2 O), (monomethylethanolamine, MMEA, + H 2 O), and (dimethylethanolamine, DMEA, + H 2 O) were studied at T = 298.15 K. (3) Excess molar volumes of aqueous solutions of (MEA + H 2 O), (diethanolamine, DEA, + H 2 O), and (triethanolamine, TEA, + H 2 O) (4) and of (methyldiethanolamine, MDEA, + H 2 O) and (ethyldiethanolamine, EDEA, + H 2 O) (5) were measured from T = (298.15 to 353.15) K. Densities and excess molar volumes of (DMEA + H 2 O) and (diethylethanolamine, DEEA, + H 2 O) were reported at T = (293.15 to 313.15) K. (6) Transport properties of pure ethanolamines (7) and (DEA + H 2 O) and (MDEA + H 2 O) have also been studied. (8) Heat capacities (9) and thermal conductivities (10) (12) and of (monoethylethanolamine,…”

The Use of the Multiobjective Function-De Algorithm in the Application of Extended UNIQUAC for CO2-MEA-H2O System

“…Leibush and Shorina [18] Conners [19] Lychkin et al [20] Danilov et al [21] Wohland [22] de Oliveira et al [23] Touhara et al [24] Nath and Bender [25] Buslaeva et al [26] Lenard et al [27] Kim et al [28] Kling and Maurer [29] Chang et al [30] Dohnal et al [31] Posey [32] Cai et al [33] Maham et al [34] Park and Lee [35] Tochigi et al [36] Tanaka et al [37] …”