Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?
Correct answer: D. Selectivity
- A. Cost
- B. Availability
- C. Toxicity
- D. Selectivity
Explanation
The separating agent must preferentially alter the relative volatility of the components being separated, so selectivity is the key technical criterion. Cost, availability, and toxicity matter in final selection but do not determine separation effectiveness.
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