Construction of a novel generator for use in HF adsorption studies

An HF generator based on the dissociation pressure of an alkali bifluoride is described. Sodium bifluoride salt was found to yield HF pressures of the order of 0.001 to 0.3 mm in the temperature range 60 to 135 °C due to the equilibrium . The HF generator allows a dry carrier gas (typically N 2 ) to...

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Bibliographic Details
Published in:Canadian journal of chemistry 1978-08, Vol.56 (15), p.2034-2038
Main Authors: Kimmerle, Frank M, Archambault, A, Dube, Ghyslain
Format: Article
Language:English
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Summary:An HF generator based on the dissociation pressure of an alkali bifluoride is described. Sodium bifluoride salt was found to yield HF pressures of the order of 0.001 to 0.3 mm in the temperature range 60 to 135 °C due to the equilibrium . The HF generator allows a dry carrier gas (typically N 2 ) to pass through a thermoregulated chamber filled with the crystalline bifluoride and furnishes HF concentrations from 5 to 1000 ppm at flowrates up to 5 ℓ/min for periods up to one year. The HF concentrations thus generated were stable to within 1% after a 40 min warm up period. Described also is the associated control system which allows the operator to send alternately dry carrier gas with or without trace HF concentration to an external cell or analyser.
ISSN:0008-4042
1480-3291
DOI:10.1139/v78-332