METHOD OF PRODUCING CHLORINE, CAUSTIC SODA AND HYDROGEN Russian patent published in 2014 - IPC C25B1/46 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing chlorine, an alkali metal hydroxide and hydrogen, and a computer-controlled device for carrying out the disclosed method, wherein the method includes the following steps: (a) preparing brine by dissolving an alkali metal chloride source in water; (b) removing the alkaline precipitate from the brine obtained at step (a) in the presence of hydrogen peroxide or in the presence of at most 5 mg/l active chlorine using an activated carbon filter and obtaining ready brine; (c) treating at least a portion of the ready brine obtained at step (b) at an ion-exchange step; (d) treating at least a portion of brine obtained at step (c) at an electrolysis step; (e) separating at least a portion of chlorine, alkali metal hydroxide, hydrogen and brine obtained at step (d); (f) treating at least a portion of brine obtained at step (e) at a dechlorination step, carried out in the presence of hydrogen peroxide; and (g) recycling at least a portion of the dechlorinated brine obtained at step (f) to step (a).

EFFECT: cost-effective method of producing chlorine which is automated to such an extent that it is suitable for remote control and requires minimal immediate attention and maintenance.

11 cl, 1 dwg