Processes for the production of fluoropropanes and halopropenes
US-RE49849-E · Feb 27, 2024 · US
Selective catalytical dehydrochlorination of hydrochlorofluorocarbons
US9724684B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9724684-B2 |
| Application number | US-201213397956-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 16, 2012 |
| Priority date | Feb 21, 2011 |
| Publication date | Aug 8, 2017 |
| Grant date | Aug 8, 2017 |
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Abstract
Official abstract text for this publication.
A dehydrochlorination process is disclosed. The process involves contacting R f CHClCH 2 Cl with a chromium oxyfluoride catalyst in a reaction zone to produce a product mixture comprising R f CCl═CH 2 , wherein R f is a perfluorinated alkyl group.
First claim
Opening claim text (preview).
What is claimed is: 1. A dehydrochlorination process comprising contacting R f CHClCH 2 Cl with a dehydrochlorination catalyst in a reaction zone to produce a product mixture comprising R f CCl═CH 2 , wherein R f is a perfluorination alkyl group and wherein the dehydrochlorination catalyst is chromium oxyfluoride having the formula Cr 2 O x F y , wherein x+y/2=3, optionally in the presence of HF. 2. The dehydrochlorination process of claim 1 wherein the dehydrochlorination process is conducted in the presence of HF. 3. The dehydrochlorination process of claim 1 wherein R f is CF 3 . 4. The dehydrochlorination process of claim 1 wherein the temperature in the reaction zone is from about 200° C. to about 500° C. 5. The dehydrochlorination process of claim 4 wherein the temperature in the reaction zone is from about 275° C. to about 450° C. 6. The dehydrochlorination process of claim 1 wherein the product selectivity to R f CCl═CH 2 is at least 90 mole %. 7. The dehydrochlorination process of claim 1 wherein the product selectivity to R f CCl═CH 2 is at least 95 mole %. 8. The dehydrochlorination process of claim 1 wherein an inert gas is additionally present. 9. The dehydrochlorination process according to claim 2 wherein the mole ratio of HF to R f CHClCH 2 Cl in the reaction zone is no more than 0.9. 10. The dehydrochlorination process of claim 9 conducted in the presence of HF, wherein the mole ratio of HF to R f CHClCH 2 Cl in the reaction zone is no more than 0.5. 11. The dehydrochlorination process of claim 10 wherein the mole ratio of HF to R f CHClCH 2 Cl in the reaction zone is no more than 0.1. 12. The dehydrochlorination process of claim 1 wherein the dehydrochlorination process is conducted in the absence of HF. 13. The dehydrochlorination process according to claim 1 wherein the chromium oxyfluoride catalyst has a surface area of about 10 m 2 /g to about 800 m 2 /g. 14. The dehydrochlorination process according to claim 13 wherein the chromium oxyfluoride catalyst has a surface area of about 20 m 2 /g to about 400 m 2 /g. 15. The dehydrochlorination process according to claim 14 wherein the chromium oxyfluoride catalyst has a surface area of about 40 m 2 /g to about 300 m 2 /g.
Assignees
Inventors
Classifications
Fluorinating · CPC title
- C07C17/25Primary
by splitting-off hydrogen halides from halogenated hydrocarbons · CPC title
with chromium, molybdenum, tungsten or polonium · CPC title
Fluorides · CPC title
Fluorides · CPC title
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Frequently asked questions
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- What does patent US9724684B2 cover?
- A dehydrochlorination process is disclosed. The process involves contacting R f CHClCH 2 Cl with a chromium oxyfluoride catalyst in a reaction zone to produce a product mixture comprising R f CCl═CH 2 , wherein R f is a perfluorinated alkyl group.
- Who is the assignee on this patent?
- Nappa Mario Joseph, 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 Aug 08 2017 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).