METHOD OF CHLORINE DIOXIDE PREPARATION Russian patent published in 2009 - IPC C01B11/02 

FIELD: chemistry.

SUBSTANCE: invention can be used in chlorine dioxide preparation. The method of continuous chlorine dioxide production in the absence-of-crystallisation mode includes: feeding to the first reactor of the alkali metal chlorate, mineral acid and hydrogen peroxide; forming of the chlorine dioxide and salt of the alkali metal and mineral acid; removal from the first reactor of the chlorine dioxide and depleted reaction mixture containing the mineral acid, alkali metal chlorate and salt of the alkali metal and mineral acid; and input of the said mixture to the second reactor. The hydrogen peroxide is also input to the second reactor and the alkali metal chlorate concentration in it is maintained in the range from ca 9 to ca 75 mole/l. As a result the reaction of the alkali metal chlorate, hydrogen peroxide and mineral acid the forms in the second reactor the chlorine dioxide and salt of the alkali metal and mineral acid; then the gaseous chlorine dioxide and depleted reaction mixture containing mineral acid and salt of the alkali metal and mineral acid is removed from the second reactor.

EFFECT: invention allows decreasing of the equipment corrosion without increasing of the alkali metal chlorate losses in the second reactor.

16 cl, 1 tbl, 1 ex