Claims
- 1. A desiccant for use with a refrigerant comprising difluoromethane, said desiccant comprising a potassium exchanged zeolite A having greater than about 60 percent of available cations exchanged with potassium and a clay binder, said desiccant having a water adsorption capacity greater than about 15 weight percent, having essentially no difluoromethane adsorption capacity, and having a surface ratio of silicon to aluminum of less than about 1.7 mol/mol as determined by X-ray photoelectron spectroscopy.
- 2. The desiccant of claim 1 wherein the difluoromethane adsorption capacity is less than about 1.2 weight percent.
- 3. The desiccant of claim 1 wherein the difluoromethane adsorption capacity is less than about 1.0 weight percent.
- 4. The desiccant of claim 1 wherein the difluoromethane adsorption capacity is less than about 0.5 weight percent.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a Division of application Ser. No. 09/376,684 filed Aug. 18, 1999, now U.S. Pat. No. 6,168,720 which application is a continuation-in-part of application Ser. No. 08/879,448 filed Jun. 20, 1997, now U.S. Pat. No. 6,020,281, the contents of which are hereby incorporated by reference.
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
6-327968 |
Nov 1994 |
JP |
Non-Patent Literature Citations (2)
Entry |
Donald W. Breck, Zeolite Molecular Sieves, published by Robert E. Krieger Publishing Company, Malabar, Florida No date available. |
Paper “Inorganic Fluoride Uptake as a Measure of Relative Compatibility of Molecular Sieve Desiccants with Fluorocarbon Refrigerants” by Alan P. Cohen and C. Scott Blackwell published in American Heating, Refrigeration, and Air Conditioning Engineers, vol. 101, pp. 1-7, and presented on Jun. 26, 1995 at the Annual ASHRAE Conference in San Diego, CA. |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08/879448 |
Jun 1997 |
US |
Child |
09/376684 |
|
US |