METHOD OF SEPARATING ZEOTROPIC MIXTURE OF BUTYL PROPIONATE AND PROPIONIC ACID Russian patent published in 2015 - IPC B01D3/40 C07B63/00 C07C7/08 

FIELD: chemistry.

SUBSTANCE: method of separating a zeotropic mixture of butyl propionate and propionic acid, components of which have relative volatility close to one, includes separating said mixture by extraction rectification using sulpholane as the parting agent, taken in ratio of 1:6-7 to the starting mixture in an extraction rectification column with efficiency of 40-50 theoretical plates, wherein the reflux ratio in the column is equal to 2-3, followed by collection of butyl propionate in the distillate and the mixture of propionic acid and supholane in the bottom of the column (1); the mixture of propionic acid and sulpholane is then fed into a column for regenerating the parting agent (2) with efficiency of 8 theoretical plates and reflux ratio equal to 0.8-1; the parting agent is removed from the bottom of the column (2) and fed into column (1). Pressure in column (1) is equal to 760 mmHg and pressure in column (2) is equal to 100 mmHg.

EFFECT: simple technique, low capital costs and high quality of the obtained products.

1 dwg, 1 tbl