Determination of acetic anhydride and acetic acid concentrations in the distillate withdrawn from the distillation columnA mixture of acetic acid and acetic anhydride was charged in the reactor and subjected to distillation with total reflux. The mole fraction of acetic acid in the reflux was determined by using a refractometer (ATAGO, Model 3T) and a gas-chromatograph (Hewlett Packard,
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