Method for the treatment of chloride-containing waste waters

Chemistry of inorganic compounds – Halogen or compound thereof – Hydrogen halide

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423178, 423482, 423488, 423555, 210702, 210712, C01B 703, C01F 1146

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active

044629761

ABSTRACT:
Treatment of waste water containing chlorides comprising treatment with Ca (OH).sub.2 or CaCO.sub.3 to convert the chlorides to CaCl.sub.2, adding sulfuric acid to said water in a reaction vessel to produce hydrochloric acid and gypsum, circulating the mixture in a closed cycle between the reaction vessel and a distillation column for the extractive distillation of the resulting hydrochloric acid, and filtering out the accumulating gypsum sludge from the treated waste water, wherein the added amount of waste water amount of hydrochloric acid correspond to the amount of sludge exiting the reaction vessel or the amount of distillate removed from the distilling column and the amount of gypsum separated, and the hydrochloric acid concentration in the liquid is less than the maximum azeotropic concentration for a mixture of H.sub.2 O and HCl.

REFERENCES:
patent: 601006 (1898-03-01), Sturcke
patent: 1581436 (1926-04-01), Galt
patent: 3233978 (1966-02-01), Alkemade
patent: 4120737 (1978-10-01), Berrie et al.
Henglein et al, German printed application M 24936 IVa/12i, Jun. 29, 1956.

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