# US 11,123,727 B2 · Method for converting a C4-C6 olefin into ethylene, propylene and/or butylene

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- Number: US 11,123,727 B2
- Document ID: US11123727B2
- Status: Granted
- Kind: B2
- Application number: 16/800,635
- Filed: 2020-02-25
- Published: 2020-06-18
- Granted: 2021-09-21
- Earliest claimed: 2018-05-31
- Assignees: King Fahd University of Petroleum and Minerals
- Applicants: King Fahd University of Petroleum and Minerals
- Inventors: Palani Arudra
- Web page: https://patentgrep.com/patent/US11123727B2

## CPC

- B01J 29/18: of the mordenite type
- B01J 37/26: Fluorinating
- B01J 29/40: of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
- C07C 4/06: Catalytic processes {(C07C4/025 takes precedence)}
- B01J 35/615: {100-500 m2/g}
- B01J 2229/123: in order to deactivate outer surface
- B01J 2229/183: in framework positions
- B01J 2229/186: not in framework positions
- B01J 2229/20: to introduce other elements in the catalyst composition comprising the molecular sieve, but not specially in or on the molecular sieve itself
- B01J 2229/26: to stabilize the total catalyst structure
- B01J 2229/32: Reaction with silicon compounds, e.g. TEOS, siliconfluoride
- C07C 11/04: Ethene
- C07C 11/06: Propene
- C07C 11/08: with four carbon atoms
- C07C 2529/40: of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
- Y02P 20/52: using catalysts, e.g. selective catalysts
- 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 method for producing a fluoride functionalized zeolite catalyst is described, having a F/Si molar ratio of 0.1:1-3:1. The method involves mixing a fluoride salt with zeolite components to form a gel, which is then hydrothermally treated and calcined. The fluoride functionalized zeolite catalyst may be used for cracking an olefin stream into ethylene, propylene, and butylene, with high selectivity towards propylene. The fluoride functionalized zeolite catalyst may be used for 50 or more hours with a stable conversion rate and low coke formation.

## Claims

### Claim 1

A method of using a fluoride functionalized zeolite catalyst to convert a C4-C6 olefin into ethylene, propylene, and/or butylene, the method comprising:
contacting a gas stream comprising the C4-C6 olefin with the fluoride functionalized zeolite catalyst at a temperature of 400-700° C. to produce ethylene, propylene, and/or butylene,
wherein the fluoride functionalized zeolite catalyst has a F to Si molar ratio of 0.1:1.0-3.0:1.0, an average particle size of 0.1-5.0 mm, and
wherein at least 75 mol % of the C4-C6 olefin present is converted to ethylene, propylene, and/or butylene.

### Claim 2 (depends on 1)

The method of claim 1, wherein at least 85 mol % of the C4-C6 olefin present is converted to ethylene, propylene, and/or butylene.

### Claim 3 (depends on 1)

The method of claim 1, wherein the C4-C6 olefin is 1-hexene, and a mole percentage of propylene produced with respect to moles 1-hexene consumed is 60-85%.

### Claim 4 (depends on 1)

The method of claim 1, wherein the C4-C6 olefin is 1-hexene, and wherein over a reaction period of 24-72 hours,
at least 85 mol % of the 1-hexene present is converted to ethylene, propylene, and/or butylene,
and a mole percentage of propylene produced with respect to moles 1-hexene converted is 60-85%.

### Claim 5 (depends on 1)

The method of claim 1, wherein the C4-C6 olefin is present in the gas stream at a partial pressure of 20-500 kPa.

### Claim 6 (depends on 1)

The method of claim 1, wherein the gas stream further comprises an inert carrier gas.

### Claim 7 (depends on 1)

The method of claim 1, wherein the fluoride functionalized zeolite catalyst is substantially free of phosphorous and sodium.

### Claim 8 (depends on 1)

The method of claim 1, wherein the C4-C6 olefin is fed to a fixed bed reactor at a flow rate of 5-20 mL/h per g fluoride functionalized zeolite catalyst.