Ultrafast Chemical Separations (1993) / Chapter Skim
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7. Continuous Gas-Phase Chemistry
7. Continuous Gas-Phase Chemistry
Pages 70-76
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From page 70... ...
A continuous supply of products has been used in batch processes; i.e., gas-phase separations have been used for volatile elements like nitrogen, noble gases, bromine, and iodine. Dropesky and Schardt [DroS6l, in their study of the decay of 24Ne, passed the irradiated neon gas through an activated carbon trap cooled in dry ice; the impurities were retained by the trap, and pure neon flowed through.
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From page 71... ...
Thermochromatography has also been used to separate the volatile products fanned. A second approach is to form volatile compounds of elements of interest by aBowing the recoiling products to chemically react with a reactive gas used in the gas jet; selective adsorption of the products by different traps could lead to the separation of the element of interest.
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From page 72... ...
Selenium was retained by a trap containing charcoal on quartz powder coated with silver. The chemical separations of selenium and teBur~um are We only report procures where the volatile products are formed outside the target chamber without the addition of another reactive gas.
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From page 73... ...
The gas stream leaving the plug passed through a 60-cm-Iong thermochromatographic column having a negative temperature gradient of 15.5°C/cm. The deposition along the column was analyzed using gamma-ray spectroscopy.
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From page 74... ...
They also concluded that the reaction probability was greater for teBunum formed directly in fission compared to tellurium atoms formed by beta decay. These results established the possibility of continuously producing volatile species in the target chamber and their use in gas-phase separations.
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From page 75... ...
The gas mixture passed through a series of traps. The first trap, containing quartz wool, retained clusters carrying nonvolatile fission products as weld as 2~ produced by activation of fluorine in the Teflon coating of the target chamber.
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From page 76... ...
Variable leak valve; 3. Quartz glass tube; 4.
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