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Why is it difficult to separate mixtures of oxygenates, paraffinic and olefinic hydrocarbons?

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Why is it difficult to separate mixtures of oxygenates, paraffinic and olefinic hydrocarbons?

(a) Temperature

(b) Pressure

(c) Azeotrope formation

(d) Isotrope formation

The question was posed to me during an interview.

My doubt stems from Synol and Isosynthesis Processes in section Hydrocarbon Synthesis and Hydroformylation of Unit Processes

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Correct choice is (c) Azeotrope formation

The best I can explain: The complexity of separating the mixtures of oxygenates and paraffinic and olefinic hydrocarbons. Fractionation alone may not be sufficient, because of overlapping boiling points and formation of azeotropes between oxygenates and hydrocarbons.

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