METHOD OF SEPARATING BIAZETROPIC MIXTURE BUTYLPROPIONATE-PROPIONIC ACID Russian patent published in 2014 - IPC B01D3/40 

FIELD: chemistry.

SUBSTANCE: to separate a biazetropic mixture butylpropionate-propionic acid used is a method of extractive rectification with application as a separating agent of sulpholane (SF), taken in ratio 1:5-6 to an initial mixture in a column of extraction rectification with efficiency 35-50 t.t., with reflux ratio in the column being 1-3. Withdrawal of butylpropionate in distillate and the mixture propionic acid-sulpholane in the column bottom is carried out. After that, the mixture PC-SF is supplied to the column of the separating agent regeneration with efficiency 8 t.t., value of reflux ratio is 0.5-1.0. The separating agent is withdrawn from the column bottom and supplied into the column. Pressure in the columns constitutes 100 mm Hg. The method makes it possible to obtain the target products (BP, PA) of a specified quality - 99.5 mol%.

EFFECT: simplification of technology and reduction of capital expenditure, increased quality of obtained products.

1 dwg, 1 tbl