# US 8,148,586 B2 · Catalytic production processes for making tetrafluoropropenes and pentafluoropropenes

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- Number: US 8,148,586 B2
- Document ID: US8148586B2
- Status: Granted
- Kind: B2
- Application number: 13/152,405
- Filed: 2011-06-03
- Published: 2011-09-29
- Granted: 2012-04-03
- Earliest claimed: 2006-07-13
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Mario Joseph Nappa; Velliyur Nott Mallikarjuna Rao
- Web page: https://patentgrep.com/patent/US8148586B2

## CPC

- B01J 27/132: with chromium, molybdenum, tungsten or polonium
- B01J 23/26: Chromium
- B01J 37/26: Fluorinating
- C07C 17/25: by splitting-off hydrogen halides from halogenated hydrocarbons
- B01J 35/613: {10-100 m2/g}
- Y02P 20/582: Recycling of unreacted starting or intermediate materials
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A process is disclosed for making CF3CF═CHF. The process involves contacting at least one hexafluoropropane selected from the group consisting of CF3CF2CH2F and CF3CHFCHF2 with a chromium oxyfluoride catalyst in a reactor to obtain a product mixture comprising CF3CF═CHF, and recovering CF3CF═CHF from the product mixture. A process is disclosed for making CF3CH═CHF. The process involves contacting CF3CH2CHF2 with a chromium oxyfluoride catalyst in a reactor to obtain a product mixture comprising CF3CH═CHF, and recovering CF3CH═CHF from the product mixture. A process is disclosed for making CF3CF═CH2. The process involves contacting CF3CF2CH3 with a chromium oxyfluoride catalyst in a reactor to obtain a product mixture comprising CF3CF═CH2, and recovering CF3CF═CH2 from the product mixture.

## Claims

### Claim 1

A process comprising: (a) contacting 1,1,1,2,2-pentafluoropropane with a chromium oxyfluoride catalyst in a reactor to obtain a product mixture comprising 2,3,3,3-tetrafluoropropene; and (b) recovering said 2,3,3,3-tetrafluoropropene from said product mixture; wherein said chromium oxyfluoride catalyst is represented by formula Cr2OxFy wherein x+y/2=3.

### Claim 2 (depends on 1)

The process of claim 1 wherein said catalyst has surface areas of about 20 m2/g to about 500 m2/g.

### Claim 3 (depends on 1)

The process of claim 1 wherein said catalyst has surface areas of about 40 m2/g to about 350 m2/g.

### Claim 4 (depends on 1)

The process of claim 1 wherein said catalyst has surface areas of about 60 m2/g to about 300 m2/g.

### Claim 5 (depends on 1)

The process of claim 1 wherein said catalyst has surface areas of about 100 m2/g to about 300 m2/g.

### Claim 6 (depends on 1)

The process of claim 1 wherein said catalyst contains an alkali metal content of about 2000 ppm or less.

### Claim 7 (depends on 1)

The process of claim 1 wherein said catalyst contains an alkali metal content of about 300 ppm or less.

### Claim 8 (depends on 1)

The process of claim 1 wherein said catalyst contains an alkali metal content of about 100 ppm or less.

### Claim 9 (depends on 1)

The process of claim 1 wherein said contact is conducted at a temperature of from about 200° C. to about 500° C.

### Claim 10 (depends on 1)

The process of claim 1 wherein said contact is conducted at a temperature of from about 300° C. to about 400° C.

### Claim 11 (depends on 1)

The process of claim 1 wherein said catalyst is amorphous.

### Claim 12 (depends on 1)

The process of claim 1 wherein said catalyst is prepared from crystalline α-Cr2O3.

### Claim 13 (depends on 1)

The process of claim 1 wherein said catalyst is produced in situ.

### Claim 14 (depends on 1)

The process of claim 1 wherein an inert gas is also fed to said reactor.

### Claim 15 (depends on 14)

The process of claim 14 wherein said inert gas is nitrogen.

### Claim 16 (depends on 1)

The process of claim 1 wherein a gas comprising oxygen is also fed to said reactor.

### Claim 17 (depends on 16)

The process of claim 16 wherein said gas is air.