Ethanolamine solutions vapor pressure

Chemical reactions in the liquid phase are either reversible or irreversible. Typical reversible reactions are involved in the absorption of H2S into ethanolamines, or the absorption of CO2 into alkali carbonate solutions. These reversible reactions permit the resultant solution to be regenerated so that the solute can be recovered in a concentrated form. Some irreversible reactions are the absorption of NH3 into dilute acids and the absorption of CO2 into alkaline hydroxides. The solute in such absorptions is so tightly bound in the reaction product that there is no appreciable vapor pressure of solute above the liquid phase. Under these conditions, regeneration of the solute is not possible, and the reacting component in the liquid is consumed. The purpose of such a reactant is to increase the solubility of the solute in the liquid phase and/or reduce the liquid-film resistance to mass transfer. Much theoretical work has been conducted since the 1950s to study diffusion and reaction in the liquid phase [19]. To calculate the effect of the rate of chemical reaction on the mass transfer requires the prediction of physical/chemical constants of salt solutions, such as equilibrium constants, reaction velocities, solubilities, and diffusion coefficients. Often, these constants must be available at elevated temperatures and/or pressures. 

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