METHOD FOR PRODUCTION OF SODIUM NITRITE AND ZINC OXIDE Russian patent published in 2023 - IPC C01B21/50 C01D13/00 C01G9/02 

FIELD: chemistry.

SUBSTANCE: invention can be used in the chemical industry and other branches of economy. A method for the production of sodium nitrite NaNO₂ of sodium nitrate NaNO₃ includes heating of sodium nitrate with metal, followed by dissolution in water of the resulting solid substance, precipitation of water-insoluble metal oxide with a residue of sodium nitrite in the solution. Zinc is used as metal. Heating of zinc in the form of particles, together with milling ceramic balls, is carried out in a bath of melted sodium nitrate inside a rotating reel of a ball mill, at a temperature of 308-320°C. Precipitated water-insoluble zinc oxide ZnO is used as a separate commercial product.

EFFECT: invention allows for obtainment in one technological process of two commercial products – sodium nitrite and zinc oxide, reduction in energy costs due to reduction in a temperature, simplification of a technology, and reduction in an environmental impact.

2 cl, 3 ex