Desiccant for HFC-32 and HFC-152A
US5514633A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1994 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Apr 29, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/186
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.