Method for producing and purifying 2,3,3,3-tetrafluoro-1-propene
US-2018370880-A1 · Dec 27, 2018 · US
Process for the purification of pentafluoroethane
US9975825B1 · US · B1
| Field | Value |
|---|---|
| Publication number | US-9975825-B1 |
| Application number | US-201615566074-A |
| Country | US |
| Kind code | B1 |
| Filing date | Apr 11, 2016 |
| Priority date | Apr 14, 2015 |
| Publication date | May 22, 2018 |
| Grant date | May 22, 2018 |
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Abstract
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The invention relates to a process for the purification of pentafluoroethane (R125) containing chloropentafluoroethane (R115). The mixture to be purified is subjected to an extractive distillation, the extractant being selected from dimethylformamide (DMF), dioxane, dimethylsulphoxide (DMSO) and diethylsulphoxide (DESO).
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for the purification of pentafluoroethane containing chloropentafluoroethane by extractive distillation, said process comprising the use of an extractant selected from dimethylformamide, dioxane, dimethylsulphoxide and diethylsulphoxide. 2. The process according to claim 1 , in which the extractant is selected from dimethylsulphoxide and diethylsulphoxide. 3. The process according to claim 1 , in which the distillation is carried out under a pressure ranging from atmospheric pressure to 20 bars. 4. The process according to claim 1 , in which the pentafluoroethane/chloropentafluoroethane molar ratio before distillation ranges from 2 to 99. 5. The process according to claim 1 , in which the pentafluoroethane/chloropentafluoroethane molar ratio after distillation ranges from 5 to 99999. 6. The process according to claim 1 , in which the mixture containing pentafluoroethane and chloropentafluoroethane to be purified originates from the fluorination reaction of perchloroethylene or from an intermediate fluorination product of said perchloroethylene. 7. The process according to claim 6 , in which the intermediate fluorination product of said perchloroethylene is selected from dichlorotrifluoroethane or chlorotetrafluoroethane. 8. The process according to claim 1 , in which the mixture containing pentafluoroethane and chloropentafluoroethane to be purified originates from the hydrogenolysis reaction of chloropentafluoroethane.
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- C07C17/386Primary
with auxiliary compounds · CPC title
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Frequently asked questions
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- What does patent US9975825B1 cover?
- The invention relates to a process for the purification of pentafluoroethane (R125) containing chloropentafluoroethane (R115). The mixture to be purified is subjected to an extractive distillation, the extractant being selected from dimethylformamide (DMF), dioxane, dimethylsulphoxide (DMSO) and diethylsulphoxide (DESO).
- Who is the assignee on this patent?
- Arkema France
- What technology area does this patent fall under?
- Primary CPC classification C07C17/386. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 22 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).