Ionic association of some tetraheptylammonium and tetraoctylphosphonium salts in methyl isobutyl ketone |
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| Affiliation: | 1. Egyptian Nuclear and Radiological Regulatory Authority, P.O. Box 11762, Cairo, Egypt;2. Egyptian Petroleum Research Institute (EPRI), P.O. Box 11727, Cairo, Egypt;1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;2. Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals, University of Science and Technology Beijing, Beijing 100083, PR China;1. Division of Advanced Materials Engineering, Kongju National University, Chungnam 330-717, Republic of Korea;2. Energy Efficiency Research Division, Korea Institute of Energy Research, Daejeon 305-343, Republic of Korea;3. Agency for Defense Development, Yuseong, P.O. Box 35-4, Daejeon 305-600, Republic of Korea;1. Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, No.1800 Lihu Avenue, Wuxi 214122, PR China;2. Postdoctoral Scientific Research Working Station of Shengli Oilfield, SINOPEC, Dongying, 257067, PR China;3. Zanyu Technology Group Company Ltd., Hangzhou 310009, PR China |
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| Abstract: | The extent of ionic association of (hept)4NCl, (hept)4NBr, (hept)4NI, (hept)4N(NO3) and (oct)4P(NO3) in methyl isobutyl ketone at 55°C has been measured by vapour pressure osmometry with matched thermistors. From the dependence of the osmotic coefficient on the solute concentration the equilibrium constants for ion-pair formation have been obtained for the five quaternary salts. These equilibrium constants are compared with the predictions of Bjerrum's ionic-association model and the Denison-Ramsay-Fuoss model. The latter model required a correction term for the entropy contribution. |
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