Solubility and diffusivity of CO2 in triethanolamine solutions

The objective of this study was to measure directly the physical solubility and diffusivity Of CO2 in aqueous triethanolamine (TEA) solutions via the protonation method. The method is based on the protonation of TEA solutions by HCl prior to contacting the solutions to CO2 to eliminate the solutions reactivity with CO2. The properties were measured for concentrations of 10 , 20, and 30 mass% TEA in the solution over the temperature range (20-60)de greesC. The volumetric and the wetted sphere methods were used to measure t he solubility and diffusivity, respectively. The measured data of solubilit y and diffusivity were well fitted versus temperature by an exponential for m. The measured properties by the protonation technique and the available l iterature values measured by the "N2O analogy" method were compared. Good a greement between the two methods was found.