Methanol → Methanol methyl heptafluorobutyrate

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In the specific embodiment herein described employing methanol and heptafluorobutyric acid as reactants, distillation of the resulting esterification reaction admixture results in a methanol/methyl heptafluorobutyrate azeotrope characterized by a boiling point of about 56°-58° C. at substantially atmospheric pressure. This azeotrope also is characterized by about 78-80 weight percent methyl heptafluorobutyrate and correspondingly about 22-20 weight percent methanol. It is noted that the specific azeotrope of my discovery is a minimum boiling azeotrope boiling at a temperature substantially below both the boiling point of methanol, 65° C., and of methyl heptafluorobutyrate, 80° C.

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