ISOTOPE EFFECTS INVOLVING LIQUID AND GASEOUS OXIDES OF NITROGEN UNDER PRESSURIZED CONDITIONS.
Item
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Title
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ISOTOPE EFFECTS INVOLVING LIQUID AND GASEOUS OXIDES OF NITROGEN UNDER PRESSURIZED CONDITIONS.
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Identifier
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AAI8501165
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identifier
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8501165
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Creator
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PRENCIPE, MICHAEL.
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Contributor
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Takanobu Ishida
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Date
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1984
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Physical
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Abstract
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An isotope exchange apparatus that withstands elevated pressures and highly corrosive environments and is equipped with automatic level controls to facilitate its operation over a period of several days was designed and fabricated. This system was used to study N-15 production by means of a countercurrent isotope exchange between a gas and liquid phase composed of NO-NO(,2) mixtures.;Results show that at near ambient temperatures the effective single stage separation factor, (alpha), increases with partial pressure of nitric oxide. At 15(DEGREES)C, (alpha) increases from 1.006 at atmospheric pressure, to 1.030 at 4 atm. HETP studies indicate that at elevated pressures the overall exchange rate of nitrogen isotopes across the liquid-vapor interphase is relatively rapid (HETP = 1.07 cm at 4 atm, 15(DEGREES)C, and a liquid flow of 17.4 mmoles N/cm('2)(,(.))min). Comparative data for the exchange system suggests a twenty-fold decrease in the volume of column needed to accomplish a given isotope separation task when pressure is increased from 1 to 4 atm at 15(DEGREES)C. This is a direct consequence of the increase in (alpha) with pressure. Furthermore, the results indicate the volume of the column at elevated pressures (4 atm and 15(DEGREES)C) is approximately the same as that of much lower temperatures (1 atm and -9(DEGREES)C), thereby eliminating the need for refrigeration.;A force field calculation based on recent spectroscopic data for condensed and gaseous N(,2)O(,3) and N(,2)O(,4) in conjuction with a chemical composition study of the NO-NO(,2) mixture predicts the single stage separation factor obtained from exchange column experiments reasonably well and significantly better than previous work. The results give a complete assignment for all fundamentals and support 160 cm('-1) for (nu)(,7) and 610(TURN)630 cm('-1) for (nu)(,8) of N(,2)O(,3) and 265(TURN)270 cm('-1) for (nu)(,10) of N(,2)O(,4).
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Chemistry
