Process for drying CH.sub.2 F.sub.2 refrigerant utilizing zeolite
US5347822A · kind A · utility
24Cited by
2References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 23, 1993 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Dec 23, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2205/43
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Difluoromethane (R32) is of current interest as a partial replacement for chlorodifluoromethane (R22) refrigerant heretofore widely used in vapor compression refrigeration systems. R32 has, however, proved to be more reactive than is desirable with the zeolite A adsorbent-desiccant compositions used in such systems to prevent corrosion and freeze-up problems. The sodium cation form of a zeolite having the crystal structure of zeolite B is found to be an effective adsorbent for that purpose and to be significantly less reactive with the R32.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.