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How do we remove the presence of acidic impurities in the manufacture of isopropanol?

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How do we remove the presence of acidic impurities in the manufacture of isopropanol?

(a) Wash water

(b) Caustic wash

(c) Sulphuric acid

(d) Phosphoric acid

The question was asked in final exam.

My question is taken from C3 Compounds topic in chapter Synthetic Organic Chemical Industries of Chemical Technology

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Correct answer is (b) Caustic wash

The explanation is: The isopropanol vapours consists acidic impurities which can be removed with the help of a caustic wash tower. Caustic wash generally consists of caustic soda. Sulphuric acid is used as an absorber in hydration of propylene.

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