Catalytic conversion of hydrofluoroalkanol to hydrofluoroalkene

Details Catalytic conversion of hydrofluoroalkanol to hydrofluoroalkene Catalytic conversion of hydrofluoroalkanol to hydrofluoroalkene

2006-04-11

2006-04-11

Richter, Johann (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

C570S140000, C570S142000

Reexamination Certificate

active

07026520

ABSTRACT:
Methane is used as the selective dehydrating agent for the production of 2,3,3,3-tetrafluoro-1-propene (R1234yf) from 2,2,3,3,3-pentafluoro-1-propanol. Supported transition metal catalysts are prepared and used for this reaction with high activity. Almost 58% selectivity to R1234yf is obtained at an alcohol conversion level of 60% using unsupported Ni-mesh as the catalyst. Pd and Pt show almost similar level of conversion; however, the selectivity to the desired product is low. The activity of the metal catalyst was found to be a function of the type of support material, activated carbon showing better activity than alumina. Different important process parameters such as temperature, pressure, and contact time are studied to optimize the process. High pressure and temperature are deleterious to the rate of 1234yf formation; yet, the highest yield to 1234yf is obtained while performing a reaction at 494° C. with a contact time of 23 sec.

REFERENCES:
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patent: 328148 (1989-08-01), None
patent: 06072925 (1994-03-01), None

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