28-36

EFFECT OF PRESSURE ON EXCESS THERMODYNAMIC CHARACTERISTICS OF WATER + FORMAMIDE MIXTURE

Using the experimental data on the densities at atmospheric pressure and compressibil-ity coefficients, k=(Vo-V)/Vo, of water + FA mixture the changes in the following thermody-namic parameters were calculated under the pressure increase up to 100 MPa within the tem-perature range from 288.15 to 323.15 K: excess molar Gibbs energy, ΔPo→PGmE, excess molar entropy ,ΔPo→PSmE, and excess molar entropy ΔPo→PHmE. It was established that ΔPo→PGmEvalues were negative over the whole concentration range and minima appeared on ΔPo→PGmE= f(x2) functions at x2≈0.33. The pressure growth up to 100 MPa resulted in ΔPo→PGmE absolute values increase within entire concentration and temperature intervals. The changes in entropy component, -(ΔPo→PTSmE), of ΔPo→PGmEvalues were almost canceled by the enthalpy component changes. Minimal values of ΔPo→PSmE corresponded to x2≈ 0.33, exactly at that composition 2Н2О-FA associate formed.

2016, Т. 59, № 6, Стр. 28-36

ВЛИЯНИЕ ДАВЛЕНИЯ НА ИЗБЫТОЧНЫЕ ТЕРМОДИНАМИЧЕСКИЕ ХАРАКТЕРИСТИКИ СМЕСИ ВОДА + ФОРМАМИД

Рассчитаны изменения в избыточной мольной энергии Гиббса ∆P0→PGmE,
избыточной мольной энтропии ∆P0→PSmE и
избыточной мольной энтальпии ∆P0→PHmE в смеси
вода (1) + формамид (2) из-за повышения давления от атмосферного до 100 МПа в интервале
температур 288,15-323,15 К Показано, что зависимости ∆P0→PGmE,

2016, Т. 59, № 6, Стр. 28-36
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