# US 5,710,351 A · Process for producing hexafluoroethane

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- Number: US 5,710,351 A
- Document ID: US5710351A
- Status: Granted
- Kind: A
- Application number: 08/630,534
- Filed: 1996-04-10
- Granted: 1998-01-20
- Earliest claimed: 1996-04-10
- Assignees: Showa Denko K.K.
- Inventors: Hiromoto Ohno; Tetsuo Nakajo; Tatsuharu Arai; Toshio Ohi
- Web page: https://patentgrep.com/patent/US5710351A

## CPC

- C07C 17/10: of hydrogen atoms (combined with addition of halogens to unsaturated hydrocarbons C07C17/06)
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

A process for producing hexafluoroethane which comprises reacting a hydrofluorocarbon containing two carbon atoms in the molecule with fluorine gas at an elevated temperature in a vapor phase in the presence of a diluent gas.

## Claims

### Claim 1

A process for producing hexafluoroethane which comprises reacting a hydrofluorocarbon containing two carbon atoms in the molecule with fluorine gas at an elevated temperature in a vapor phase in the presence of a diluent gas.

### Claim 2 (depends on 1)

The process as claimed in claim 1, wherein the diluent gas is a gas comprising at least one of tetrafluoromethane, hexafluoroethane, octafluoropropane, and hydrogen fluoride.

### Claim 3 (depends on 1)

The process as claimed in claim 1, wherein the diluent gas is rich in hydrogen fluoride.

### Claim 4 (depends on 1)

The process as claimed in claim 1, wherein the reaction is conducted at a temperature of from 250.degree. to 500.degree. C.

### Claim 5 (depends on 1)

The process as claimed in claim 1, wherein the hydrofluorocarbon containing two carbon atoms in the molecule is a hydrofluorocarbon containing three or more fluorine atoms.

### Claim 6 (depends on 5)

The process as claimed in claim 5, wherein the hydrofluorocarbon containing two carbon atoms in the molecule is at least one of 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, and pentafluoroethane.

### Claim 7 (depends on 6)

The process as claimed in claim 6, wherein the hydrofluorocarbon containing two carbon atoms in the molecule is 1,1,1,2-tetrafluoroethane.

### Claim 8 (depends on 1)

The process as claimed in claim 1, wherein the reaction is conducted while regulating the concentration of the hydrofluorocarbon containing two carbon atoms in the molecule as measured at the reactor inlet to 6 mol % or lower.

### Claim 9 (depends on 8)

The process as claimed in claim 8, wherein the concentration of 1,1,1,2-tetrafluoroethane as measured at the reactor inlet is 4 mol % or lower.

### Claim 10 (depends on 1)

The process as claimed in claim 1, wherein the reaction is conducted at a reaction pressure of from 0 to 3 MPa.