Production of concentrated aqueous solutions of ferric chloride

Details Production of concentrated aqueous solutions of ferric chloride Production of concentrated aqueous solutions of ferric chloride

1995-03-09

1996-08-20

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Soap making

422211, 422234, 422256, 422235, 422198, 422190, 159DIG16, B01J 1400

Patent

active

055476376

ABSTRACT:
35% to 45% by weight concentrated aqueous solutions of ferric chloride, directly useful as flocculating agents in a variety of water treatments, are prepared by (a) digesting iron with a dilute aqueous solution of hydrochloric acid until such acid has essentially been consumed and thereby producing an aqueous solution of ferrous chloride; (b) reacting chlorine with such aqueous solution of ferrous chloride, in the presence of a recycled aqueous solution of ferric chloride; (c) decompressing the step (b) reaction product solution to vaporize water therefrom, thereby concentrating same; and (d) recycling a fraction of the decompressed liquid phase to step (b) and recovering remaining fraction as final product aqueous solution of ferric chloride.

REFERENCES:
patent: 1054400 (1913-02-01), Dow et al.
patent: 1938461 (1933-12-01), Prutton
patent: 2096855 (1937-10-01), Ladd
patent: 5219531 (1993-06-01), Clair et al.

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