METHOD OF PRODUCING CHROMIC ANHYDRIDE Russian patent published in 2009 - IPC C01G37/33 

FIELD: chemistry.

SUBSTANCE: invention relates to production of chromic anhydride and can be used in the chemical industry. The method of producing chromic anhydride from a highly concentrated solution of sodium bichromate involves reacting sodium bichromate with sulphuric acid in a reactor with direct contact of the reaction mass with flue gas, obtained from burning natural gas, accompanied by melting the formed chromic anhydride and sodium bisulphate, and subsequent separation of chromic anhydride and sodium bisulphate by settling. Highly concentrated solution of sodium bichromate is treated with flue gas from burning natural gas with direct contact of flue gas with the solution, with formation of a solid phase consisting of anhydrous crystals of sodium bichromate.

EFFECT: cutting on contact time of reaction mass with flue gas in the reactor, smaller size of the reactor, increased intensity of the process and output of the product, improved corrosion conditions for operation of the reactor.

7 cl, 2 dwg