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2007 | 5 | 4 | 1019-1063

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Anomalously large kinetic isotope effect



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Activated diffusion of water between macromolecules in swollen cellulose is accompanied by anomalously high kinetic isotope effects of oxygen. The separation factor of heavy-oxygen water (H218O /H216O) is thousands of permilles instead of tens of permilles according to modern Absolute Rate Theory. This anomalous separation under usual conditions is disguised by the opposing process of very fast equalization to equilibrium through water-filled cellulose pores. This process is quicker by approximately 3 orders of magnitude than diffusion through the cellulose body. As a consequence, this opposition-directed equalization virtually eliminates the results of isotope separation. To reveal this anomaly it is necessary to suppress equalization, which was the primary problem for both discovery of this anomaly and its investigation. The method of investigating the anomalous separation in cellulose was developed with suppression of this negative influence. Discussion of the theoretical nature of the anomalous kinetic isotope effect is presented. This theoretical study would probably permit the discovery and use for isotope separation of the anomalously high isotope effect for other chemical elements, in particular, for those heavier than oxygen. [...]










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1 - 12 - 2007
12 - 9 - 2007


  • Yozmot HaEmek Technological Incubator, P.O. Box 73, Migdal HaEmek, Israel, 23100


  • [1] M. Mulder: Basic Principles of Membrane Technology, Kluwer Academic Publishers, Dordrecht/Boston/London, 1991.
  • [2] A.F. Turbak: Synthetic Membranes: Volume 1, Desalination, A.C.S. Symposium Series 1, Washington D.C., 1981.
  • [3] Y. Osada and T. Nakagawa: Membrane Science and Technology, Marcel Dekker, Inc., New York, Basel, Hong, 1992.
  • [4] F.A. Rodgers: Apparatus for increasing the concentration of a less volatile liquid fraction in a mixture of liquids, US Pat., 3,562,116 (1971).
  • [5] G. Zakrzewska-Trznadel, A.G. Chmielewski and N.R. Miljevic: “Separation of protium/deuterium and oxygen-16/oxygen-18 by membrane distillation”, J. Membrane Sci., Vol. 113, (1996), pp. 337–342. http://dx.doi.org/10.1016/0376-7388(95)00131-X[Crossref]
  • [6] A.G. Chmielewski, G. Zakrzewska-Trznadel, N.R. Milievic and V. Hook: “16O/18O and H/D separation factors for liquid/vapor permeation of water through a hydrophobic membrane”, J. Membrane Sci., Vol. 60, (1991), pp. 319–329. http://dx.doi.org/10.1016/S0376-7388(00)81543-4[Crossref]
  • [7] R.F. Schofield, A.G. Fane and C.J.D. Fell: “Heat and mass transfer in membrane distillation”, J. Membrane Sci., Vol. 33, (1987), pp. 299–313. http://dx.doi.org/10.1016/S0376-7388(00)80287-2[Crossref]
  • [8] R.F. Schofield, A.G. Fane, C.J.D. Fell and R. Macoun: “Factors affecting flux in membrane distillation”, Desalination, Vol. 77, (1990), pp. 279–294.
  • [9] Perry: Chemical Engineer’s Handbook, Sixth Edition, 1988, pp. 17–68.
  • [10] Vlijanie isotopii na physico-chimicheskie svoistva zidkostey, Nauka, Moskva, 1968 pp. 67 and 70.
  • [11] D.W. Setser and B.S. Rabinovich: “Thermal Unimolecular Geometric and Structural Isomerization of 1,2-Dideuterio-3-methylcyclopropane”, Vol. 86, (1964), pp. 564–569.
  • [12] P.J. Robinson and K.A. Holbrook: Unimolecular Reactions, Wiley-Interscience, London, NewYork, Sydney, Toronto, 1972. pp. 184–263.
  • [13] E.W. Schlag and B.S. Rabinovich: “Kinetic of the Thermal Unimolecular Isomerization Reactions of Cyclopropane-d2”, J. Am. Chem. Soc., Vol. 82, (1960), pp 5996–6000. http://dx.doi.org/10.1021/ja01508a008[Crossref]
  • [14] C.S. Parmenter and B.M. Stone: “The methyl rotor as accelerating functional group for IVR”, J. Chem. Phys., Vol. 84, (1986), pp. 4710–4711. http://dx.doi.org/10.1063/1.449999[Crossref]
  • [15] J. Ree, K.S. Chang, Y.H. Kim and H.K Shin: “Collision-Induced Intramolecular Energy Flow in Highly Excited Toluene”, Bull. Korean Chem. Soc., Vol. 24, (2003), pp. 1223–1226. http://dx.doi.org/10.5012/bkcs.2003.24.8.1223[Crossref]
  • [16] T. Lenzer, K. Luther, J. Troe, R.G. Gilbert and K.F. Lim: “Trajectory simulation of collisional energy transfer in highly excited benzene and hexafluorobenzene”, J. Chem. Phys., Vol. 103, (1995), pp. 626–641. http://dx.doi.org/10.1063/1.470096[Crossref]
  • [17] D.L. Clarke, I. Oref, and R.G. Gilbert: “Collisional energy transfer in highly excited molecules: Calculations of the dependence on temperature and internal, rotational, and translational energy”, J. Chem. Phys., Vol. 96, (1992), pp. 5983–5998. http://dx.doi.org/10.1063/1.462639[Crossref]
  • [18] H. K. Shin: “Effects of the multiplicity of impacts on vibration-translation energy transfer in collinear collisions”, J. Chem. Phys., Vol. 62, (1975), pp. 4130–4137. http://dx.doi.org/10.1063/1.430291[Crossref]
  • [19] J. Ree, Y.H. Kim and H.K. Shin: “Collision-induced intramolecular energy flow and C-H bond dissociation in excited toluene”, J. Chem. Phys., Vol. 116, (2002), pp. 4858–4870. http://dx.doi.org/10.1063/1.1452726[Crossref]
  • [20] V. Bernshtein and I. Oref: “Trajectory calculations of relative center of mass velocities in collisions between Ar and toluene”, J. Chem. Phys., Vol. 104, (1996), pp. 1958–1965. http://dx.doi.org/10.1063/1.470950[Crossref]

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