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Production of short chain perfluoroalkyl iodides from higher order telomers
US9624147B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9624147-B2 |
| Application number | US-201514922237-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 26, 2015 |
| Priority date | Oct 30, 2014 |
| Publication date | Apr 18, 2017 |
| Grant date | Apr 18, 2017 |
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Abstract
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An improved process for producing perfluoroalkyl iodides of formula (I) F(CF 2 CF 2 ) n —I (I) wherein n is an integer from 2 to 3, wherein the improvement comprises thermolyzing at least one perfluoroalkyl iodide of formula (II), optionally in the presence of perfluoroethyl iodide, formula (III) F(CF 2 CF 2 ) m —I (II) F(CF 2 CF 2 ) p —I (III) wherein m is an integer greater than or equal to 4, and p is 1, wherein a) the molar ratio of formula (III) to formula (II) is less than 1.0, b) the residence time is from about 0.1 to about 10 seconds, and c) the temperature is from about 450° C. to about 500° C.
First claim
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What is claimed is: 1. An improved process for producing perfluoroalkyl iodides of formula (I) F(CF 2 CF 2 ) n —I (I) wherein n is an integer from 2 to 3, wherein the improvement comprises thermolyzing at least one perfluoroalkyl iodide of formula (II), optionally in the presence of perfluoroethyl iodide, formula (III) F(CF 2 CF 2 ) m —I (II) F(CF 2 CF 2 ) p —I (III) wherein m is an integer greater than or equal to 4, and p is 1, wherein a) the molar ratio of formula (III) to formula (II) is 0, b) the residence time is from 0.1 to 10 seconds, and c) the temperature is from 450° C. to 500° C. 2. The process of claim 1 wherein the selectivity for species (I) is greater than 45 mol %. 3. The process of claim 1 wherein the temperature is from 470° C. to 495° C. 4. The process of claim 1 wherein the residence time is held at from 0.4 to 9 seconds. 5. The process of claim 1 wherein the selectivity for species (I) is greater than 45 mol % without use of iodine as a reactant. 6. The process of claim 1 wherein the selectivity for perfluoroalkanes is less than 20 mol %. 7. The process of claim 6 wherein the selectivity for perfluoroalkanes is less than 10 mol %. 8. The process of claim 1 , performed in the absence of a TFE trap species. 9. An improved process for producing perfluoroalkyl iodides of formula (I) F(CF 2 CF 2 ) n —I (I) wherein n is an integer from 2 to 3, wherein the improvement comprises thermolyzing, in the absence of a TFE trap species, at least one perfluoroalkyl iodide of formula (II), optionally in the presence of perfluoroethyl iodide, formula (III) F(CF 2 CF 2 ) m —I (II) F(CF 2 CF 2 ) p —I (III) wherein m is an integer greater than or equal to 4, and p is 1, wherein a) the molar ratio of formula (III) to formula (II) is 0, b) the residence time is from 0.1 to 10 seconds, and c) the temperature is from 450° C. to 500° C. 10. The process of claim 9 wherein the selectivity for species (I) is greater than 45 mol %. 11. The process of claim 9 wherein the residence time is held at from 0.4 to 9 seconds. 12. The process of claim 9 wherein the temperature is from 470° C. to 495° C.
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and iodine · CPC title
- C07C17/361Primary
by reactions involving a decrease in the number of carbon atoms · CPC title
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- What does patent US9624147B2 cover?
- An improved process for producing perfluoroalkyl iodides of formula (I) F(CF 2 CF 2 ) n —I (I) wherein n is an integer from 2 to 3, wherein the improvement comprises thermolyzing at least one perfluoroalkyl iodide of formula (II), optionally in the presence of perfluoroethyl iodide, formula (III) F(CF 2 CF 2 ) m —I (II) F(CF 2 CF 2 ) p —I (III) wherein m is an integer greater than …
- 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 C07C17/361. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 18 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).