Azeotropic mixture Bubble column

Columns of extractive and autoextractive distillation are widely used in industry (Benedict Rubin, 1945 Drew, 1979 Happe, Cornell, Eastman, 1946 Hoffman, 1964 Kogan, 1971). The separation process of binary mixtures with azeotrope, having minimum bubble temperature, with the help of heavy entrainer brought into the column higher than the main feed was discovered empirically and started to be used in the 1940s in connection with military needs - in particular, for extraction of butadiene and toluene. 

---