Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1976-01-12
1976-12-07
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
204DIG11, 423292, 423659, B01J 110, C01B 3506
Patent
active
039961206
ABSTRACT:
A boron trichloride starting material containing both boron-10 isotopes and oron-11 isotopes is selectively enriched in one or the other of these isotopes by a laser-induced photochemical method involving the reaction of laser-excited boron trichloride with either H.sub.2 S or D.sub.2 S. The method is carried out by subjecting a low pressure gaseous mixture of boron trichloride starting material and the sulfide to infrared radiation from a carbon dioxide TE laser. The wave length of the radiation is selected so as to selectively excite one or the other of boron-10 BCl.sub.3 molecules or boron-11 BCl.sub.3 molecules, thereby making them preferentially more reactive with the sulfide. The laser-induced reaction produces both a boron-containing solid phase reaction product and a gaseous phase containing mostly unreacted BCl.sub.3 and small amounts of sulfhydroboranes. Pure boron trichloride selectively enriched in one of the isotopes is recovered as the primary product of the method from the gaseous phase by a multi-step recovery procedure. Pure boron trichloride enriched in the other isotope is recovered as a secondary product of the method by the subsequent chlorination of the solid phase reaction product followed by separation of BCl.sub.3 from the mixture of gaseous products resulting from the chlorination.
REFERENCES:
patent: 3937956 (1976-02-01), Lyon
Ambartzumian et al., JETP Letters, vol. 21, Mar. 20, 1975, pp. 375-378.
Freund Samuel M.
Ritter Joseph J.
Englert Alvin J.
Pawlikowski Eugene J.
The United States of America as represented by the Secretary of
Williams Howard S.
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