The Chemzcar! Engmeerzng Journal, 52 (1993) 41-47 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Short Communication 41 zyxwvu Kinematic viscosities of binary mixtures of 1 ,2-ethanediol and 2-methoxyethanol at different temperatures zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Andrea Marchetti, Mara Tagliazucchi, Lorenzo Tassl* and Giuseppe Tosi Departmat of Chenwhy, Unwerxty of Modena, Vza G Campz, 183 I-41100 Mockma (i&z&) (Received December 4, 1992, III final zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA form December 14, 1992) Abstract zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Kinematx wscosdies have been measured for l,Betha- nediol, 2-methoxyethanol and nine bmary nuxtures thereof over the endue composition range and at 19 temperatures rangmg from - 10 to 80 “C Several emprrical relatrons (e g. McAlbster, Henc, Lobe, Gnmberg-Nissan and po- lynormal equatrons) have been used in order to fit the expenmental data and to correlate the bmary nuxture results wrth the kmematic vrscositles of the pure com- ponents. All these approaches correlate the kmematlc vrscosrty data well, whrle the adnrstable parameters pro- vrde some useful mformatron about the specrfic mter- actions between Merent molecules 1. Introduction In recent years much effort has been made m the experrmental investrgatron of the thermome- chanical properties of hqurd mixtures. In fact, the use of bmary or more complex solvent systems makes possible continuous variation m macroscopic and measurablequantities such as density, vrscosny, dielectric constant, refractwe index and any related property that reflects the real behaviour of the solutes 111 such solvents. These properties are also interesting from the pomt of view of mdustrral applicatrons; m fact, knowledge of them 1s very important for the solution of flurd dynamic and transport problems. Further- more, the easy determmation of these varrable quan- titles makes on-hneprocess control possrblein many cases, e.g. in polymerization, ester&cation and hy- drolysis reactions, smce these quantities are strrctly *Author to whom correspondence should be addressed 0923-0467/93/$6 00 related to the cornpositron of the system and hnked to the degree of conversion. A survey of the hterature reveals only a few attempts to study m detarl bmary hquld nuxtures contaming 1,2-drhydroxyethane (DHE) [ 11; the work reported here is part of a general programme of work on tlus solvent, which IS the snnplest hom- ologue of the diol series. In previous papers [2, 31 we reported on the acid-base tnrunetric behavlour of various solutes m DHE and 2-methoxyethanol (ME), both as non- aqueous pure solvents and binary mixtures, working by conductometnc techniques m the temperature range from - 10 to 75 “C and covering the whole miscibrlity field expressed by the mole fraction of DHE (0 <X,< 1). The results obtamed were very intrrgumg, especially for the specrfic mteractions between the drfferent components (solver+ cosolvent) m the hquid state. Furthermore, those studies provided much detarled expenmental evr- dence on the formation and disappearance of the most unportant species, e.g. ion pairs, during the neutrahzatlon reactions. In order to extend our knowledge of these bmary nuxtures, we have now measured the kmematrc vrscosities m the range - 10 <t < 80 “C and these measurements have been used to test the most common approaches (Mc- Allister, Henc, Lobe, polynomial and Grun- berg-Nissan equations) able to predict the vrscos- lties of bmary liquid mixtures not experimentally determined, startmg from the data of the pure components. The results of thrs analysis are mter- preted 111 terms of intermolecular interactions and geometrical effects 111 the nuxtures 2. Experimental work 2 1. Materials The solvents 1,Zethanedrol and 2-methoxyethanol (contammg less than 0.10% and less than 0.05% water respectively as found by Karl-Fischer trtration) were Carlo Erba (Milan) lugh purity grade. 2.2. Measurm and apparatus The mixtures were prepared by weight Just before then use, usmga Mettler analytmal balance operatmg in a dry nitrogen atmosphere in order to avoid atmosphenc morsture. The probable error m the 0 1993 - Elsevrer Sequoia All nghts reserved