Refrigerant composition
US6669862B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 2003 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Jan 17, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2205/43
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A refrigerant composition comprises a mixture of three HFC (hydrofluorocarbons) refrigerants, namely, HFC 32, HFC 125 and HFC 134a. A lower alkyl alcohol such as ethanol is included in the mixture to improve miscibility in commonly-used lubricants such as mineral oil by altering the viscosity of the entrained oil within the operating air-conditioning system. Optionally, a fifth component made be added, namely a hydrocarbon based refrigerant such as iso-butane or propane, to further improve characteristics of refrigerant. The resulting refrigerant is similar in characteristics to R22, and is compatible with existing air-conditioning and refrigeration devices originally for use with R22 refrigerant without system modifications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.