# US 2016/0251284 A1 · Staged synthesis of diiodoperfluoro-c3 to c7-alkanes

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- Number: US 2016/0251284 A1
- Document ID: US20160251284A1
- Status: Published application
- Kind: A1
- Application number: 15/053,699
- Filed: 2016-02-25
- Published: 2016-09-01
- Earliest claimed: 2015-02-27
- Assignees: The Chemours Company Fc, LLC
- Applicants: The Chemours Company Fc, LLC
- Inventors: MING HONG HUNG; Alexander Anthony Marchione; Peter A. Morken
- Web page: https://patentgrep.com/patent/US20160251284A1

## CPC

- C07C 17/272: by addition reactions
- C07C 17/093: by replacement by halogens
- C07C 17/204: {the other compound being a halogen}
- C07C 17/26: by reactions involving an increase in the number of carbon atoms in the skeleton
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The process is provided for forming the reaction product comprising the homologue mixture of I(CF2)nI, wherein n is 3 to 7, which may contain at least one of the contaminants ICF2I and I(CF2)2I, by the steps comprising (a) reacting iodine with hexafluoropropylene oxide at a temperature of 150° C. to 210° C. in a reactor, the amount of said hexafluoro-propylene oxide being a portion of the total amount of hexafluoropropylene oxide to be reacted with said iodine, thereby forming a reaction product containing gaseous perfluoroacetyl fluoride as a reaction by-product, (b) cooling said reaction product to become liquid except for said gaseous perfluoroacetyl fluoride, (c) venting said perfluoroacetyl fluoride from said reactor, and (d) repeating said steps (a), (b), and (c) until said total amount of said HFPO is reacted with said iodine.

## Claims

### Claim 1

The process of forming the reaction product comprising the homologue mixture of I(CF2)nI, wherein n is 3 to 7, which contains at least one of the contaminants ICF2I and I(CF2)2I, by the steps comprising
(a) reacting iodine with hexafluoropropylene oxide at a temperature of 150° C. to 210° C. in a reactor, the amount of said hexafluoropropylene oxide being a portion of the total amount of hexafluoropropylene oxide to be reacted with said iodine, thereby forming a reaction product containing gaseous perfluoroacetyl fluoride as a reaction by-product,
(b) cooling said reaction product to become liquid except for said gaseous perfluoroacetyl fluoride,
(c) venting said perfluoroacetyl fluoride from said reactor, and
(d) repeating said steps (a), (b), and (c) until said total amount of said HFPO is reacted with said iodine,
and obtaining as a result thereof said reaction product comprising said homologue mixture.

### Claim 2 (depends on 1)

The process of claim 1 wherein the portion of said hexafluoropropylene oxide reacted in each of said step (a) is from 10 to 50% of said total amount of said hexafluoropropylene oxide reacted with said iodine.

### Claim 3 (depends on 1)

The process of claim 1 wherein the molar proportion of said total amount of said hexafluoropropylene oxide reacted with said iodine is at least 3.0.

### Claim 4 (depends on 1)

The process of claim 1 wherein the yield of said reaction product is at least 70%.

### Claim 5 (depends on 1)

The process of claim 1 wherein said homologue mixture of I(CF2)nI, wherein n is 3 to 7 resulting in the carrying out of said process comprises at least 90% (GC area) of said reaction product.

### Claim 6 (depends on 1)

The process of claim 1 wherein said contaminants ICF2I and I(CF2)2I, are present in said reaction product in amounts of no greater than 1% and no greater than 0.1%, respectively.

### Claim 7 (depends on 1)

The process of claim 1 further comprising heating said reaction product to at least 220° C. at least after the last step (a) of said repeating said steps (a), (b) and (c).

### Claim 8 (depends on 1)

The process of claim 1 wherein said reacting in step (a) is carried out in the presence of catalyst.

### Claim 9 (depends on 8)

The process of claim 8 wherein said reacting step is carried out in the absence of added catalyst.