Densities and volumetric properties of the aqueous solutions of 2-amino-2-methyl-1-propanol, n-butyldiethanolamine and n-propylethanolamine at temperatures from 298.15 to 353.15 K (original) (raw)

2002, Fluid Phase Equilibria

Densities of the mixture {water (1) + N-methylurea (2)} in the concentration range to mole fraction x 2 = 0.07071 (or to the solution molality concentration m 2 = 4.22335 mol•kg −1) at atmospheric pressure in the temperature range from 274.15 to 333.15 K and compression k = ΔV/V 0 at pressures to 100 MPa (10, 25, 50, 75, and 100) in the temperature range from 278.15 to 323.15 K (278.15, 288.15, 288.15, 308.15, 323.15) in the same concentration range were calculated in this study. The apparent molar volumes of N-methylurea V ϕ,2 and the partial molar volumes of both components V̅ 1 and V̅ 2 in the mixture, molar isothermal compressibilities K T,m , molar isobaric thermal expansions E P,m , and isochoric coefficients of thermal pressure β of the mixture were calculated. Moreover, volumetric measures for the infinitely dilute solution of N-methylurea solution were calculated: limiting partial molar volumes V̅ 2 ∞ , the limiting partial molar isothermal compressibilities K̅ T,2 ∞ , and the limiting partial molar isobaric thermal expansions E̅ P,2 ∞. The results obtained are discussed from the point of view of solute−solvent and solute−solute interactions.