Separation of Boron Isotopes by Distillation of (CH3)2O-BF3 Complex

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abdollahi, Mojtaba | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41710 (46)
University: Sharif University of Technology
Department: Energy Engineering
Advisor(s): Outokesh, Mohammad; Ahmadi, Javad
Abstract:
Natural boron includes two stable isotopes 10B and 11B with 19.3 and 80.7 weight percent respectivley.10B isotope has a high thermal neutron absorption cross section. So isotope 10B material is suitable for making atomic reactor control rods. Other and even more important applications of 10B are in disclosing neutrons in order to measure neutron reactors fluxes and also are in nuclear physics laboratories and medical radiation. This isotope also is used in the pharmaceutical and the military industries. There are several methods for separating boron isotopes. Among the distillation methods, thermal diffusion of BF3, distillation of BF3, distillation of methyl borate, boric acid distillation by steam, distillation with isotope exchange between liquid complex (C2H5) 2O-BF3 with BF3 gas and distillation together with isotope exchange between complex liquid (CH3 ) 2O-BF3 with BF3, can be mentioned. Among the stated methods, distillation method with isotope exchange is used in the industrial scale.
Keywords:
Isotope Separation ; Dimethyl Ether ; Distillation ; Chemical Exchange ; Boron Triflouride ; Dimethyl Ether-Boron Threefloride Complex