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What is the temperature range of middle oil?

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What is the temperature range of middle oil?

(a) 50-80°C

(b) 100-150°C

(c) 140-180°C

(d) 200-400°C

I had been asked this question in an international level competition.

The question is from Industrial Processes-III in section Hydrogenation of Unit Processes

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Right choice is (d) 200-400°C

Explanation: A portion of this product boiling in the range of about 200-400°C is commonly termed middle oil, and it may contain 10-20 per cent of phenol. Products boiling above the middle oil are recycled to the liquid-phase hydrogenation step.

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