Desiccant for HFC-32 and HFC-152A
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United States of America Patent
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May 7, 1996
Grant Date -
N/A
app pub date -
Apr 29, 1994
filing date -
May 24, 1993
priority date (Note) -
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Abstract
A method for the production of a desiccant for HFC-32, HFC-152a and blended refrigerants containing HFC-32 and/or HFC-152a comprises immersing formed articles of 3A type zeolite having 20 to 60% in ion equivalent weight of its sodium ions exchanged for potassium ions in an aqueous solution of at least one member selected from the group consisting of sodium silicate and potassium silicate, thereby effecting deposition of SiO.sub.2 on the formed articles, removing the SiO.sub.2 -deposited formed articles from the aqueous solution, dehydrating the wet formed articles and subsequently activating the dehydrated formed articles. Also provided is a desiccant for HFC-32, HFC-152a and blended refrigerants containing HFC-32 and/or HFC-152a produced by this method.
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