Question

Q -1) what is the raw material of iodine manufacture (Give at least three) ?

Q-2) write down the process of iodine manufacture in detail ?

Q-3) give the Schematic flow diagram of iodine manufacture ?

Q-4) write down the reactions of iodine manufacture (Give at least three) ?

Answer 1

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Answer 1

Manufacture of iodine :

Iodide is present in the salty brines of natural gas fields and is extracted to make iodine by three main processes:

Blow-out – During the blow-out process, oxidized iodine is extracted in a countercurrent air flow process based on the distinct vapor pressure of the iodine. The iodine-filled air is reduced to iodide by the addition of sulfur oxide. In the finishing process, the acidic iodide solution is oxidized by addition of chlorine to form iodine crystals.

Carbon Absorption – Carbon Absorption is most often used when the brine has a low iodine concentration. The free iodine in the acidified brine solution is captured with activated carbon and neutralized with ammonia. The iodine is extracted from the activated carbon using hot caustic soda, which produces an iodate-iodide mixture. This solution is acidified with sulfuric acid and the iodine is separated by filtration.

Ion Exchange – In ion exchange, the free iodine from oxidized brines is flown through resin-packed ion exchange columns. Once the resin is saturated with free iodine, it is transferred to an elution column that is treated with a caustic salt solution. The eluted iodine is recovered by addition of acid and removed by solid/liquid separation.

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