The dilute acetic acid can not be purified by conventional distillation methods. Hence, extractive distillation is employed to distill dilute acetic acid.
Dilute acetic acid is fed from top to the extraction column and the solvent ethyl acetate is fed to the column from bottom. Solvent acid coming from top of the column is sent to a distillation column where pure acetic acid is obtained as a bottom product. The top product of the column after condensation is sent to a decanter. Top over flow from the decanter is partly sent to the column as reflux and partly to the extraction column through an intermediate tank. The reffinate i.e. bottom product of the extraction column and the bottom over floe of decanter- I are mixed and sent to a recovery column to recover the solvent i.e. ethyl acetate.
The top product of the recovery column is sent to a decanter - II after condensation. The top over flow from the decanter is partly given as reflux and partly withdrawn as recovered solvent which is turn is sent to extraction column through intermediate tank. The bottom of the recovery column is sent to drain along with the bottom of the decanter - II.
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