Chemical elements
    PDB 1a31-1hc0
    PDB 1hc9-1nq2
    PDB 1nuo-1tf9
    PDB 1tha-2anx
    PDB 2aqw-2gs7
    PDB 2gsq-2ojv
    PDB 2ow0-2x4b
    PDB 2x4c-3d7f
    PDB 3d7h-3h1k
    PDB 3hhc-3njb
    PDB 3nsj-3vg2
    PDB 3vg6-4gdu

Iodine Production


Iodine is extracted from water and oil deposits as well as from mother waters of saltpeter production. Mineralized water contains 0.001-0.01% iodine in iodides. It is acidified by sulphuric or hydrochloride acid until reaching pH 2.5-3.5 and then is treated by Cl2 or NaNO2 solution for extracting elemental iodine. The extracted element is absorbed by activated coal or anionites from which it is blown out by air (air desorption method). Iodine from the coal is washed out by NaOH obtaining NaI \xD0\xB8 NaIO3 and from anionites it is extracted by mixture of Na2SO3 and NaCl. Elemental iodine is extracted from the solutions with 2-3% NaI exposing them to H2SO4 and some oxidizer such as chlorine. In air desorption method the iodine-containing air is mixed with SO2 which, in the presence of humidity, makes mixture of HI (approx. 10%) and H2SO4, from which iodine is isolated. It is then refined by sublimation or smelting under H2SO4 layer.

Saltpeter mother waters, which contain NaIO3, are treated by SO2. Iodine may be recovered also from seaweeds ashes.

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