Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid anhydrides
Patent
1996-05-21
1999-04-06
Dees, Jose' G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid anhydrides
562891, C07C 5156
Patent
active
058921109
ABSTRACT:
This invention relates to a process for producing acetic anhydride by the reaction of methyl acetate, carbon monoxide, and hydrogen at elevated temperatures and pressures in the presence of an alkyl halide and a heterogeneous, bifunctional catalyst that contains an insoluble polymer having pendant quaternized phosphine groups, some of which phosphine groups are ionically bonded to anionic Group VIII metal complexes, the remainder of the phosphine groups being bonded to iodide. In contrast to prior art processes, no accelerator (promoter) is necessary to achieve the catalytic reaction and the products are easily separated from the catalyst by filtration. The catalyst can be recycled for consecutive runs without loss in activity. Bifunctional catalysts for use in carbonylating dimethyl ether are also provided.
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Ramprasad Dorai
Waller Francis Joseph
Air Products and Chemicals Inc.
Badio Barbara
Dees Jos,e G.
Gourley Keith D.
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