Applications of toroids in high-pressure NMR spectroscopy

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Toroid detectors have distinct NMR sensitivity and imaging advantages. The magnetic field lines are nearly completely contained within the active volume element of a toroid. This results in high NMR signal sensitivity. In addition, the toroid detector may be placed next to the metallic walls of a containment vessel with minimal signal loss due to magnetic coupling with the metal container. Thus, the toroid detector is ideal for static high pressure or continuous flow monitoring systems. Toroid NMR detectors have been used to follow the hydroformylation of olefins in supercritical fluids under industrial process conditions. Supercritical fluids are potentially ideal ... continued below

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5 p.

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Klingler, R.J.; Rathke, J.W. & Woelk, K. December 1, 1995.

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Description

Toroid detectors have distinct NMR sensitivity and imaging advantages. The magnetic field lines are nearly completely contained within the active volume element of a toroid. This results in high NMR signal sensitivity. In addition, the toroid detector may be placed next to the metallic walls of a containment vessel with minimal signal loss due to magnetic coupling with the metal container. Thus, the toroid detector is ideal for static high pressure or continuous flow monitoring systems. Toroid NMR detectors have been used to follow the hydroformylation of olefins in supercritical fluids under industrial process conditions. Supercritical fluids are potentially ideal media for conducting catalytic reactions that involve gaseous reactants, including H{sub 2}, CO, and CO{sub 2}. The presence of a single homogeneous reaction phase eliminates the gas-liquid mixing problem of alternative two-phase systems, which can limit process rates and adversely affect hydroformylation product selectivities. A second advantage of toroid NMR detectors is that they exhibit a well-defined gradient in the rf field. This magnetic field gradient can be used for NMR imaging applications. Distance resolutions of 20 {mu} have been obtained.

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5 p.

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OSTI as DE96002508

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  • 210. national meeting of the American Chemical Society (ACS), Chicago, IL (United States), 20-25 Aug 1995

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  • Other: DE96002508
  • Report No.: ANL/CMT/CP--87763
  • Report No.: CONF-950801--14
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 162173
  • Archival Resource Key: ark:/67531/metadc621125

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  • December 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Dec. 14, 2015, noon

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Klingler, R.J.; Rathke, J.W. & Woelk, K. Applications of toroids in high-pressure NMR spectroscopy, article, December 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc621125/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.