FIELD: technological processes.
SUBSTANCE: invention may be used to produce pure compounds of niobium and tantalum. Device for production of pure niobium pentachloride consists of electric furnace 1, cube-evaporator 2, equipped with unit of continuous loading of initial raw materials 6, enameled shell section 3, quartz rectification tower 4, L-shaped reflux column with reflux separator 5, to which the second rectification tower 7 is connected with heated cube-evaporator 8, which is made of quartz sand and is equipped with unit for extraction of pure niobium pentachloride 9. Raw materials are continuously supplied to cube-evaporator 2 of the first tower via unit of continuous loading 6. Condensate enriched with low-boiling components and containing niobium pentachloride, is separated in reflux column 5 into three parts. One part of condensate is returned to quartz rectification tower 4. Accumulated high-boiling components, containing tantalum, are periodically drained from cube-evaporator 2. The second part of condensate enriched with low-boiling components is extracted as intermediate product from reflux column 5. The third part of condensate is sent to the second rectification column 7 for purification from low-boiling components. Pure niobium pentachloride is sent to quartz cube-evaporator 8 and is continuously drained via extraction unit 9.
EFFECT: invention makes it possible to provide for purification of niobium pentachloride to the level of stable content of tantalum in the main fractions of not more than 0,0015% during the whole process of rectification.
2 cl, 3 dwg, 2 ex
