Separation of sulfur isotopes

Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing

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203 5, 423659, B01D 5932, C01B 1748

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active

039652505

ABSTRACT:
Sulfur isotopes are continuously separated and enriched using a closed loop reflux system wherein sulfur dioxide (SO.sub.2) is reacted with sodium hydroxide (NaOH) or the like to form sodium hydrogen sulfite (NaHSO.sub.3). Heavier sulfur isotopes are preferentially attracted to the NaHSO.sub.3, and subsequently reacted with sulfuric acid (H.sub.2 SO.sub.4) forming sodium hydrogen sulfate (NaHSO.sub.4) and SO.sub.2 gas which contains increased concentrations of the heavier sulfur isotopes. This heavy isotope enriched SO.sub.2 gas is subsequently separated and the NaHSO.sub.4 is reacted with NaOH to form sodium sulfate (Na.sub.2 SO.sub.4) which is subsequently decomposed in an electrodialysis unit to form the NaOH and H.sub.2 SO.sub.4 components which are used in the aforesaid reactions thereby effecting sulfur isotope separation and enrichment without objectionable loss of feed materials.

REFERENCES:
patent: 3050367 (1962-08-01), Holmberg
patent: 3475122 (1969-10-01), McRae et al.
patent: 3523755 (1970-08-01), McRae et al.
patent: 3524801 (1970-08-01), Parsi
Steward, David W. et. al. The Further Concentration of S.sup.34 Journal of Chemical Physics vol. 8 Dec., 1940 pp. 904-907.
Wilson et al. Preparation and Measurement of Isotopic Tracers 1947 J. W. Edwards, Ann Arbor, Mich. pp. 1-10.

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