C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/181, 23/224
C01B 13/14 (2006.01) C01B 7/03 (2006.01) C01B 13/24 (2006.01)
Patent
CA 1093788
ABSTRACT OF THE DISCLOSURE: A process of thermally decomposing bi- or multivalent metals dissolved in an aqueous liquor to form the corresponding oxides and hydrogen chloride with simultaneous recovery of overazeotropic hydrochloric acid or hydrogen chloride. The hydrochloric acid recovered by adiabatic absorption from the gases formed by the decomposition is increased in concentration by an extractive distillation in contact with a concentrated metal chloride solution of bi- or multivalent metals. The metal chloride solution which becomes available as a result of the extractive distillation and is less concentrated than the feed solution of chlorides of bi- or multivalent metals is increased in concentration by a heat exchange with the hot gases formed by the decomposition. A solution of the chlorides of the bi- or multivalent metal in a higher concentration, thereof at least a part has been in direct contact with the gases formed by the decomposition, is supplied to the thermal decomposition stage at a metal chloride rate which corresponds to the metal chloride content of the incoming aqueous liquor. The process according to the invention is particularly suitable for processing metal chloride solutions which contain magnesium, aluminum, manganese, chromium, iron, cobalt and/or nickel ions. Special advantages afforded by the process reside that an overazeotropic hydrochlo- ric acid having any desired concentration. inclusive of virtual- ly pure hydrogen chloride, can be produced as one product of the decomposition process substantially without need for a supply of extraneous energy, and virtually all energy required to increase the hydrochloric acid in concentration is supplied by the waste heat which becomes available in any case as a result of the decomposition.
306894
Metallgesellschaft Aktiengesellschaft
Robic Robic & Associes/associates
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