Gas Chromatography with Hydrogen and Deuterium

Thomas, Carl O.; Smith, Hilton A.

doi:10.1021/j150573a021

Cited by 33 publications

(11 citation statements)

References 2 publications

(2 reference statements)

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“…A number of qualitative conclusions may be drawn from the results: (1) There seems t o be little variation in the separation factors rneasured on chemically identical adsorbents of different origin. Values determinecl by us on two different charcoals are nearly the same as that reported by Strange (4) on a sample of unidentified origin and, as will be shown in a s u b s e q~~e n t paper (11), similar values can be derived from the single component data ~neasured on Carbotox charcoal by van Itterbeelc anel van Dingenen (22) and on sugar charcoal by Barrer and Rideal (24).…”

Section: Resultssupporting

confidence: 87%

“…The analytical accuracy attained in this manner was better than &0.02% deuterium content, the readings being reproducible over a period of several months. The performance exceeds that of previous units described in the literature and could quite possibly be improved even further if the device is used in a flow system (11,12) where convection and ambient temperature changes become less important.…”

Section: Analytical Procedzlrementioning

confidence: 70%

“…The measurements usually consist in detei-mining equilibrium separation factors (relative adsorptivities) a or analyzing the fractions obtained by slow desorption. A ii~imber of authors have also dealt with the gas chromatographic separation of the isotopes using supported palladium (10,11) and type 5A Linde molecular sieves (12) as adsorbent.…”

Section: N'troduction R -mentioning

confidence: 99%

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Adsorption Equilibria of Hydrogen, Deuterium, and Their Mixtures. Part I

Basmadjian¹

1960

Can. J. Chem.

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Adsorption isotherms of hydrogen and deuterium have been measured a t temperatures of 75-90" I< and pressures up to 760 mm Hg on the following six adsorbents: charcoal (2), silica gel, and Linde molecular sieves type 411, 5A, and 13X.Deuterium was found to be adsorbed to a greater extent than hydrogen in all cases investigated, its isosteric heat of adsorption exceeding that of hydrogen by 50 t o 300 cal/mole.Binary adsorption isother~ns were determined on the same adsorbents in the range 10-90%Dz at temperatures of 75 and 90' K and a total pressure x of 750 and 200 mm Hg. The analyses were performed by the thermal conductivity method using thermistor sensing elements in a static system a t atmospheric pressure. The device proved of exceptional stability, requiring no recalibrations and yielding an analytical accuracy of better than 0.02% deuterium content. The binary separation factors ol were found t o be constant over the concentration range investigated, with values for a varying from about 1.25 on charcoal to 2.54 on type 4A molecular sieves a t 75' I< and 750 mm Hg. The results suggest that the variations in cu are due mainly to differences in chemical composition of the adsorbents rather than pore size, surface area, or origin of the materials.

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Section: Resultssupporting

confidence: 87%

Section: Analytical Procedzlrementioning

confidence: 70%

Section: N'troduction R -mentioning

confidence: 99%

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Adsorption Equilibria of Hydrogen, Deuterium, and Their Mixtures. Part I

Basmadjian¹

1960

Can. J. Chem.

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“…• Performed an extensive review and evaluation of prior theoretical work, mathematical models, and experiments on chromatographic separation including palladium chromatography. 6,7,8,9 • Reviewed and re-evaluated data and results from the 2004 tests in support of the HT-TCAP project.…”

Section: Approachmentioning

confidence: 99%

Heat and Mass Transfer Study to Understand Thermal-Cycling Absorption Process (TCAP) Scale-Up Issues

Xiao

Randall

Rabun

et al. 2019

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The first-year goal of this study was to better understand the underlying physics affecting the separation capability of TCAP in order to provide a strong technical basis for design of a scaled up mega-TCAP, of interest for fusion and other potential applications. Assessing mass transfer factors, researchers performed an extensive review and evaluation of prior theoretical work, mathematical models, and experiments on chromatographic separation. This effort resulted in the discovery of a previously unidentified factor impacting TCAP column scale-up. A model derived by J. Calvin Giddings indicates that the combination of coiling a packed column and increasing the column tube radius will decrease column separative performance. FY2019 Objectives Understand the fundamental physics of the efficiency losses previously noted during the 2004 HT-TCAP scale up and devise means to overcome them through the following: • Determine the factors affecting and affected by TCAP gas mass transfer • Determine the factors affecting and affected by TCAP heat transfer.

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“…Thomas and Smith [16], who also used a thermistor thermal conductivity detector, found a separation factor-temperature correlation of the form 0.51.…”

Section: Review Of Literaturementioning

confidence: 99%

Measurement of isotope separation factors in the palladium-hydrogen system using a thermistor technique

Ortiz¹

1998

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Gas Chromatography with Hydrogen and Deuterium

Cited by 33 publications

References 2 publications

Adsorption Equilibria of Hydrogen, Deuterium, and Their Mixtures. Part I

Adsorption Equilibria of Hydrogen, Deuterium, and Their Mixtures. Part I

Heat and Mass Transfer Study to Understand Thermal-Cycling Absorption Process (TCAP) Scale-Up Issues

Measurement of isotope separation factors in the palladium-hydrogen system using a thermistor technique

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