Methods for removal of sulfur dioxide (SO2) from trifluoroacetyl chloride (TFAC)
US11987553B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Sep 3, 2021 |
| Grant date | May 21, 2024 |
| Priority date | — |
| Expiry date | Oct 11, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2253/108
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Impurities such as sulfur dioxide (SO2) are removed from trifluoroacetyl chloride (TFAC) through distillation, adsorption, or a combination thereof, and/or including the formation of an azeotrope or azeotrope-like composition including effective amounts of sulfur dioxide (SO2) and trifluoroacetyl chloride (TFAC). The trifluoroacetyl chloride (TFAC) thus purified may then be used in the manufacture of trifluoroiodomethane (CF3I). Also disclosed are azeotropes and azeotrope like compositions of sulfur dioxide (SO2) and trifluoroacetyl chloride (TFAC).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.