METHOD RECTIFICATION Russian patent published in 2011 - IPC B01D3/14 

FIELD: process engineering.

SUBSTANCE: invention relates to rectification of fluid mix by distillation. Proposed method comprises countercurrent interaction of run-down fluid with raising stream, forming the stream due to evaporation of reflux running down over contact stage into column bottom, said reflux being created from partial condenser. Besides, it comprises producing extra reflux in condensation of a fraction of vapors of separated components over column height on cooled surface, and bleeding of distillate. Relation of cooled surface t_c to condensing vapor temperature t_n is kept equal to t_c/t_n=0.6-0.99. Extra reflux is subjected, prior to mixing with run-down fluid, is subjected to partial evaporation to produce secondary steam by raising steam heat due to its condensation. Note here that specific heat load of condensing steam on cooled surface is kept equal to 10²-10⁵ W/m². Fraction of steam mix of raising and secondary steam is condensed while obtained condensate is subjected again to evaporation. Fraction of raising steam is shifted in transverse direction relative to main flow of raising steam on the stage. Evaporation of extra reflux is performed in reduced-pressure zone of the stage.

EFFECT: reduced capital and production costs.

4 cl, 9 dwg, 5 ex