Method for processing gaseous effluent streams recovered from th

Gas separation – Means within gas stream for conducting concentrate to collector

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55 49, 55 51, 55 71, 423613, B01D 4705

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active

045780900

ABSTRACT:
In the manufacture of particulated metal oxides by the vapor phase oxidation of volatile metal halides, hot gaseous effluent streams are produced which, after separation of the desired particulated metal oxide therefrom, contain residual amounts of the particulated metal oxide as well as unreacted, volatile metal halide and halogen gas. The method of this invention provides for the recovery of these materials, individually, through a succession of contacting and separating steps utilizing a recycle stream of previously recovered, unreacted, liquid metal halide. Utilization of the recycle stream of metal halide provides for both evaporative cooling of the hot gaseous effluent stream to permit recovery of the residual particulated metal oxide therein and scrubbing of the resulting off-gas to recover the unreacted volatile metal halide therein as a liquid and provide a gas phase containing the by-product halogen gas. The recovered unreacted volatile metal halide liquid constitutes the recycle stream of liquid metal halide used in the process. The gas phase is subjected to a further scrubbing to separate and recover therefrom any remaining unreacted, volatile metal halide.

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