Processes for the production of fluoropropanes and halopropenes
US-RE49849-E · Feb 27, 2024 · US
Dehydrofluorination of 245fa to 1234ze
US9302962B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9302962-B2 |
| Application number | US-201514819807-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 6, 2015 |
| Priority date | Aug 14, 2014 |
| Publication date | Apr 5, 2016 |
| Grant date | Apr 5, 2016 |
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Abstract
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A method of producing a fluoropropane of formula CF 3 CH═CHF, comprising contacting a mixture of 1,1,1,3,3-pentafluoropropane and Z-1,3,3,3-tetrafluoropropene in the gas phase with a catalyst comprising at least one catalyst selected from the group consisting of fluorinated Cr 2 O 3 or Cr/Ni on fluoride alumina, in the presence of an oxygen containing gas, to form a mixture comprising Z-1,3,3,3-tetrafluoropropane, E-1,3,3,3,-tetrafluoropropene, hydrogen fluoride, and optionally unreacted 1,1,1,3,3-pentafluoropropane, separating the E-1,3,3,3-tetrafluoropropene from the Z-isomer and any unreacted 1,1,1,3,3-pentafluoropropane, if present, and recovering said E-1,3,3,3-tetrafluoropropene.
First claim
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What is claimed is: 1. A method of producing a fluoropropane of formula CF 3 CH═CHF, comprising: a) contacting a mixture of 1,1,1,3,3-pentafluoropropane and Z-1,3,3,3-tetrafluoropropene in the gas phase with a catalyst comprising at least one catalyst selected from the group consisting of fluorinated Cr 2 O 3 or Cr/Ni on fluorided alumina, in the presence of an oxygen containing gas, to form a mixture comprising Z-1,3,3,3-tetrafluoropropane, E-1,3,3,3,-tetrafluoropropene, hydrogen fluoride, and optionally unreacted 1,1,1,3,3-pentafluoropropane, b) separating the E-1,3,3,3-tetrafluoropropene from the Z-isomer and any unreacted 1,1,1,3,3-pentafluoropropane, if present, and c) recovering said E-1,3,3,3-tetrafluoropropene. 2. The method of claim 1 , wherein said mixture of 1,1,1,3,3-pentafluoropropane and Z-1,3,3,3-tetrafluoropropene comprises at least 7% by weight Z-1,3,3,3-tetrafluoropropene. 3. The method of claim 1 , wherein said mixture of 1,1,1,3,3-pentafluoropropane and Z-1,3,3,3-tetrafluoropropene comprises at least 10% by weight Z-1,3,3,3-tetrafluoropropene. 4. The method of claim 1 wherein at least 94% of the 1,1,1,3,3-pentafluoropropane is converted to E-isomer of 1,3,3,3-tetrafloropropene. 5. The method of claim 1 , wherein at least 98% of the 1,1,1,3,3-pentafluoropropane is converted to E-isomer of 1,3,3,3-tetrafloropropene. 6. The method of claim 1 , further comprising recovering Z-1,3,3,3-tetrafluoropropene, or a mixture of Z-1,3,3,3-tetrafluoropropene and 1,1,1,3,3-pentafluoropropane, and recycling Z-1,3,3,3-tetrafluoropropene, or a mixture of Z-1,3,3,3-tetrafluoropropene and 1,1,1,3,3-pentafluoropropane back to step a). 7. The process of claim 1 , wherein said hydrogen fluoride produced in step a) is separated and recovered. 8. The process of step 1 wherein said oxygen containing gas is oxygen, or air.
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- C07C17/25Primary
by splitting-off hydrogen halides from halogenated hydrocarbons · CPC title
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- What does patent US9302962B2 cover?
- A method of producing a fluoropropane of formula CF 3 CH═CHF, comprising contacting a mixture of 1,1,1,3,3-pentafluoropropane and Z-1,3,3,3-tetrafluoropropene in the gas phase with a catalyst comprising at least one catalyst selected from the group consisting of fluorinated Cr 2 O 3 or Cr/Ni on fluoride alumina, in the presence of an oxygen containing gas, to form a mixture comprising Z-1,3,3,…
- Who is the assignee on this patent?
- Chemours Co Fc Llc, Chemours Co Fc Llc
- What technology area does this patent fall under?
- Primary CPC classification C07C17/25. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 05 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). 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).