I o ur nal of S olution C hemi stry, V ol. 2 3, N o. 2, I 994 Densities, Excess Molar Yolumes, and Partial Molar Yolumes for Binary Mixtures of Water with Monoethanolamine, Diethanolamine, and Triethanolamine from 25 ta 80oC1 Yadollah Maham2, Tjoon T. Teng3, Loren G. Hepler2, and Alan E. Mathel Received August 26, 1993 ; Revised November I 0, 1993 We have rneasured densbies of binary mixtures of water with mona- etlnnolamine (MEA), diethanolamine (DEA), and triethanolarnine (TEA) over the full range of compositions and over the temperature range froru 25 to 80"C. Results of these tneasurernents lnve been used in calculating excess molar volumes and partial molar volumes. Krawledge of the volumetric properties of these mirtwes is useful in conncction with in- dustrial treatment of acidic gases; derived excess rnolar volumes and par- tial molar volumes can be used as a bosis for undcrstanding some of the twl ec ular interactions in water -or ganic mirtures. KEY WORDS: Densities; excess and partial molar volumes, binary aqueous mixtures; monoethanolamine; diethanolamine, triethanolamine, temperature dependence lPresented at the Symposium, 76e CSC Congress, Sherbrooke, Quebec, May 30-June 3, 1993, honoring Professor Donald Patterson on the occasion of his 65m birthday. 2Department of Chemistry and Department of Chemical Engineering, University of A1- berta, Edmonton, Alberta, Canada T6G 2G2. 3school of Indusrial Technology, Universiti Sains Malaysia, Penang, Malaysia. 4D"p*t**nt of Chemical Engineering, University of Alberta, Edmonton, Alberta, CanadaT6G 2G6. 195 OW5-9182P4fr2AG0195$07.00/0 @ 1994 Plenum Publishirg Corporation \./ lv