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Abstract

Catalytic process for the manufacture of acid fluoride selected from isobutyryl fluoride, methyl-2 butyryl fluoride, and pivaloyl fluoride from carbon monoxide, hydrogen fluoride, and an aliphatic hydrocarbon stream comprising principally an alkane having 3 to 4 carbon atoms, comprising the following series of stages: (a) introduction of at least one fluid chosen from carbon monoxide and the hydrocarbon stream into a reactor in the presence of a superacidic catalyst system comprising hydrogen fluoride, antimony pentafluoride, and at least one compound chosen from bromine, iodine, bromides, and iodides, (b) where appropriate, if it has not already been introduced during stage (a), introduction into the reactor of a fluid chosen from carbon monoxide and the hydrocarbon stream, under conditions that are suitable to permit the formation, principally, of a complex consisting of the alkyloxocarbonium cation and the anion SbF.sub.6.sup.--, (c) conversion of the complex into acid fluoride, (d) separation of the acid fluoride, and (e) recovery of the superacidic catalyst system. The process is applicable to the manufacture of methylmethacrylate.

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