Chemical exchange method of concentrating carbon isotopes
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2. The method of claim 1 wherein the molecular weight of the cyanohydrin is less than 150.
2. effecting reflux of the carbon-13-enriched organic phase at a temperature in the range 60* C. to a temperature below the boiling point of the organic phase in accordance with the following reaction: R1R2C(OH)CN(org)+X2CO3(aq) heat R1R2CO(org)+XCN(aq)+XHCO3(aq); where X is an alkali metal; and
3. effecting reflux of the carbon-13-depleted aqueous phase at a temperature in the range 15*-25* C. in accordance with: R1R2CO(org)+XCN(aq) +XHCO3(aq) cool R1R2C(OH)CN(org)+X2CO2(aq), where X is an alkali metal.
3. The method of claim 1 wherein the liquid organic phase comprises a cyanohydrin dissolved in the ketone from which it was derived.
4. The method of claim 1 wherein the liquid organic phase comprises acetone cyanohydrin dissolved in methyl isobutyl ketone.
5. The method of claim 1 wherein the liquid organic phase comprises methyl isobutyl ketone cyanohydrin dissolved in methyl isobutyl ketone.
6. In an improved method for concentrating carbon-13 in a liquid-liquid chemical exchange system, the improvement which comprises:
7. The method according to claim 6 wherein X is potassium.
8. The method according to claim 6 wherein XHCO3 is present in stoichiometric excess.
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