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What is used for bromine concentration?

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What is used for bromine concentration?

(a) Seawater with air

(b) Seawater with HCl

(c) Chlorinated seawater with air

(d) Chlorinated seawater with HCl

The question was asked during an online interview.

The doubt is from Chemical From Sea topic in portion Inorganic Chemical Industries of Chemical Technology

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The correct answer is (c) Chlorinated seawater with air

To explain I would say: When seawater is used, bromine is first concentrated by vaporizing chlorinated seawater with air, and then SO2 is introduced into dilute bromine laden air and is sent to an absorption tower countercurrent to water.

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