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Inorganic fluoride uptake as a measure of relative compatibility of molecular sieve desiccants with fluorocarbon refrigerants.

Author(s) : COHEN A. P., BLACKWELL C. S.

Summary

The fluoride content of molecular sieve desiccants after exposure to R32 in compatibility tests indicates the extent of the reaction of refrigerant with desiccant. The objective is to determine this fluoride content in a way that reports fluorine that has reacted with the desiccant, not fluorine that is present as adsorbed refrigerant. A conditioning procedure is described to remove the adsorbed refrigerant by displacement with water vapour. The efficacy of this procedure is substantiated by fluorine 19 nuclear magnetic resonance spectroscopy. The conditioned desiccant undergoes pyrohydrolysis at a high temperature (975 deg C) to remove reacted fluorine at high frequency. Fluoride is determined in the resulting condensate using an ion-selective electrode. The ability of this technique to report accurate fluoride values is confirmed with standard reference materials.

Details

  • Original title: Inorganic fluoride uptake as a measure of relative compatibility of molecular sieve desiccants with fluorocarbon refrigerants.
  • Record ID : 1996-3293
  • Languages: English
  • Source: ASHRAE Transactions.
  • Publication date: 1995/06/24
  • Document available for consultation in the library of the IIR headquarters only.

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