RECTIFICATION TOWER Russian patent published in 2020 - IPC B01D3/18 B01D3/32 

FIELD: machine building.

SUBSTANCE: invention relates to chemical engineering, can be used in designing and manufacturing rectification columns intended for operation with high corrosion media at high temperatures, for example, for separation of zirconium and hafnium chlorides by fractionation of their mixture in solvent-melt of potassium chloraluminate. Rectification column includes a cube, a refluxer, a body with process nozzles, consisting of rings, connected by means of welding flanges and fasteners with gaskets between flanges, horizontal plates with contact branch pipes and caps, by overflow pipes, vertical partitions for creation of hydraulic locks. Said recesses are composed of two concentric shell rings arranged with clearance. King flanges are welded to external shell. Annular groove is made in upper flange of ring. Support ring and concentric gland rings with pressure flange and parts of its attachment to lower flange of rings are installed in formed gap between flange of ring and inner shell. In the lower flange of the ring there is an annular groove with a pressure flange installed in it and welded to the inner shell and equipped with parts for its attachment to the upper flange of the ring and a ring shell installed with a gap relative to the inner shell of the underlying bowl. Gaskets are installed between pressure flanges of adjacent rings. Concentric packing rings are made of carbon braided packing impregnated with graphite suspension. Height of the gap from the upper cut of the inner shell ring to the pressing flange of the above located ring is preferably taken to be greater than the value (Δl_int – Δl_ext) by at least 1.5 times, where Δl _int – temperature elongation of inner ring shell during operation, mm; Δl_ext – thermal elongation of external ring shell during operation, mm.

EFFECT: efficient continuous operation of the rectification column for processing corrosive media at high temperature of the process for a long period of time with high economic indices.

3 cl, 3 dwg