Pulsating annular column functioning in continuous heavy phase with means for limiting the drag of heavy phase into the light phase in presence of gaseous evaporation.

摘要

The invention makes it possible to avoid the presence of heavy phase (10) in the light phase (20) leaving in the upper part (14) of an annular pulsed column, when the operation of the latter involves the presence of an ascending gas stream. According to the invention the pulsed column is equipped with a shell (34) placed in the annular upper settler (14) of the column, above a frustoconical part (28) situated at the base of the upper settler (14). Bubbles of gas (26) are trapped against the inner wall (30) and the particles of heavy phase which they entrain into the light phase return down to the level of the interface in an inner chamber (36) without being able to enter an outer chamber (38) from which the exit of the light phase takes place via the pipes (24). Application to pulsed liquid-liquid extraction columns operating in continuous heavy phase. <IMAGE>