HIGH-PURITY SODIUM NITRATE PRODUCTION METHOD Russian patent published in 2023 - IPC C01D9/16 B01D9/02 

FIELD: inorganic materials technology

SUBSTANCE: invention relates to inorganic materials technology. A solution of CP sodium nitrate and bidistilled water corresponding to saturated at a temperature of 90°C is prepared from a supersaturated aqueous solution, kept at a temperature of 95°C for 1 h, filtered and the solution cooled from 90°C to 20°C with a constant cooling rate of 0.4 deg/min to purify sodium nitrate by crystallisation. Then the product is filtered under vacuum and washed from the mother liquor with bidistilled water or a solution of bidistilled water and isopropyl alcohol.

EFFECT: invention makes it possible to obtain high-purity sodium nitrate with reduced potassium content and increase the final product yield.

3 cl, 2 dwg, 3 tbl, 3 ex