Review Density, viscosity, and excess properties of aqueous solution of diethylenetriamine (DETA) Ardi Hartono 1 , Hallvard F. Svendsen * Department of Chemical Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway article info Article history: Received 19 August 2008 Received in revised form 31 October 2008 Accepted 10 November 2008 Available online 10 December 2008 Keywords: Density Viscosity Diethylenetriamine (DETA) Excess property Redlich–Kister abstract Densities and viscosities of aqueous DETA solutions were measured for the entire concentration range and for the temperature range between (293.15 and 363.15) K. The excess molar volume was determined from the experimental density data whereas the excess Gibbs free energy and the excess entropy of flow were determined from the experimental viscosity data by implementing the theory of rate processes of Eyring. A Redlich–Kister equation was applied to correlate the excess properties such as: the excess molar volume and the excess Gibbs free energy of flow as functions of the DETA mole fraction and temperature. The results showed that the model agree very well with the experimental data. In comparison with AEEA and DEA, the excess properties of DETA are higher than these amines. Ó 2009 Published by Elsevier Ltd. Contents 1. Introduction .......................................................................................................... 973 2. Experimental section ................................................................................................... 974 3. Results and discussion .................................................................................................. 975 3.1. Density and excess molar volume of the {DETA (1) + water (2)} .......................................................... 975 3.2. Viscosity of {DETA (1) + water (2)}.................................................................................. 977 4. Conclusion ........................................................................................................... 978 Acknowledgment ..................................................................................................... 979 References .......................................................................................................... 979 1. Introduction Absorption of CO 2 with amine-based absorbents (i.e., MEA, MDEA) is an established and proven technology, however it still very energy intensive and has high capital cost. The overall chal- lenge is to bring these two factors down with new and environ- mentally acceptable solvents. A better solvent may have higher capacity, faster absorption rate, lower heat of absorption, and a more benign behavior in the environment. N-(2-aminoethyl)ethane-1,2-diamine(DETA), known as diethyl- enetriamine with three amine functionalities, can be expected to have a high loading capacity and faster absorption rate than with a single amine functionality, e.g. MEA. In order to test DETA as a candidate for CO 2 capture, a series of studies were undertaken. An NMR study of the (DETA + CO 2 +H 2 O) system shows that the system is very complex and consists of a large number of species [1]. The physical properties of aqueous solutions such as density and viscosity are required for the design of acid gas treatment equipment. The research focusing on the physical properties and the excess property have been reported for the binary mixtures of various amines and water and it is shown in table 1. In this work the physical properties of aqueous DETA solutions were measured at different concentrations and temperatures. The excess properties calculated from the experimental data were correlated with the Redlich–Kister equation and compared with DEA [2] and AEEA [11], in order to see the effect of different groups 0021-9614/$ - see front matter Ó 2009 Published by Elsevier Ltd. doi:10.1016/j.jct.2008.11.012 * Corresponding author. Tel.: +47 73594100; fax: +47 73594080. E-mail address: hallvard.svendsend@chemeng.ntnu.no (H.F. Svendsen). 1 Permanent address: Department of Chemical Engineering, Lambung Mangkurat University, Jl. A. Yani Km 35 Banjarbaru, Kalimantan Selatan, Indonesia. J. Chem. Thermodynamics 41 (2009) 973–979 Contents lists available at ScienceDirect J. Chem. Thermodynamics journal homepage: www.elsevier.com/locate/jct