Process for recovering solid sodium bicarbonate from...

Details Process for recovering solid sodium bicarbonate from... Process for recovering solid sodium bicarbonate from...

C - Chemistry, Metallurgy

25

B

C25B 1/14 (2006.01) C01D 7/07 (2006.01)

Patent

CA 2117776

2117776 9418360 PCTABS00033 The present invention relates to a method and process for recovering solid sodium bicarbonate, from the effluent (I), of the cathode compartment of a diaphragm cell (D-C) that contains sodium hydroxide and sodium chloride. The effluent is treated with carbon dioxide and ammonia (T1) to essentially convert the sodium hydroxide to sodium bicarbonate. Thereafter, the effluent (2) is treated to decompose the ammonium chloride to evolve and recycle ammonia without the formation of pollutants (S1), the treated effluent, free of NH3, CO2 and alkali, is resaturated (S) and sent to the anode compartment of the diaphragm cell. In preferred embodiments, all of the steps are interconnected and the materials produced are recycled, such that the only products produced are chlorine, hydrogen and sodium bicarbonate, without waste products in a continuous process.

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