Separation process

Details Separation process Separation process

C - Chemistry, Metallurgy

01

B

23/320, 23/363

C01B 7/14 (2006.01)

Patent

CA 1107035

ABSTRACT The components of a liquid mixture consisting essentially of HI, water and at least about 50 w/o iodine are separated in a countercurrent extraction zone by treating with phosphoric acid containing at least about 90 w/o H3PO4. The bottom stream from the extraction zone is substantially completely molten iodine, and the overhead stream contains water, HI, H3PO4 and a small fraction of the amount of original iodine. When the water and HI are present in near-azeotropic proportions, there is particular advantage in feeding the over- head stream to an extractive distillation zone wherein it is treated with additional concentrated phosphoric acid to create an anhydrous HI vapor stream and bottoms which contain at least about 85 w/o H3PO4. Concentration of these bottoms provides phosphoric acid infeed for both the countercurrent extraction zone and for the extractive distillation zone.

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