Process for the preparation of 1,1,1,2-tetrafluoroethane

Details Process for the preparation of 1,1,1,2-tetrafluoroethane Process for the preparation of 1,1,1,2-tetrafluoroethane

2011-07-19

2011-07-19

Sullivan, Daniel (Department: 1621)

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

Organic compounds

Halogen containing

C570S134000

Reexamination Certificate

active

07982074

ABSTRACT:
The present invention relates to a process for preparing a co-precipitated Cr2O3/Al2O3catalyst promoted by Zinc, said process comprising co-precipatation of chromium and aluminum metal hydroxides from corresponding trivalent metal salt solutions using NH4OH, NaOH or KOH as a base and followed by calcination to give mixed oxide precatalyst in amorphous from which is impregnated with an activity promoting amount of Zinc compound. The catalyst is used for the preparation of HFC-134a by fluorination of trichloroethylene and fluorination of intermediate of the former reaction (HCFC-133a).

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Rao, J. M., et al. “Effect of acid strength of co-precipitated chromia/alumina catalyst on the conversion and selectivity in the fluorination of 2-chloro-1, 1, 1-trifluoroethane to 1,1,1,2-tetrafluoroethane” Journal of Fluorine Chemistry, CH, Elsevier Sequoia, Lausanne, vol. 95, No. 1-2, Jun. 4, 1999, pp. 177-180.

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