Due to the small separation factor of aqueous acetic acid mixtures, to achieve concentrations of more than 90 wt% Acetic acid, simple rectification is not economic. Consequently, an extractive rectification, an azeotropic distillation, or a combination of extraction and azeotropic distillation is chosen to minimize the energy needed for the concentration.
As extractive agents, the following are applicable:
Sulfuric acid (for extractive rectification)
Butyl acetate
Ethyl acetate
Pfaudler will select the most appropriate process along with its client, based on:
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