Abstract
Aqueous solutions of diethanolamine (DEA) are commonly used to remove acid gases (including hydrogen sulfide and carbon dioxide) from natural, refinery, and other industrial gas streams. Vapor pressures of bis(hydroxyethyl)piperazine (BHEP) and tris(hydroxyethyl)ethylenediamine (THEED) were measured in the temperature ranges of (412.65 to 507.15) and (372.55 to 472.35) K using the static and gas saturation techniques, respectively. The experimental data are well represented by the modified Antoine and the integrated Clausius-Clapeyron equations, and their coefficients are reported. The enthalpies of vaporization were found to be (62.76 {+-} 5.33) and (89.96 {+-} 3.91) kJ/mol for BHEP and THEED, respectively.
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