Discussion
Statement I: Deodorisation is carried out under a deep vacuum.
Statement II: A low absolute pressure allows volatiles to be stripped at a temperature the oil can survive.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the reason for the first. Deodorisation must strip free fatty acids, aldehydes and ketones that are only sparingly volatile, and at atmospheric pressure the temperature needed would decompose the oil, darken it and generate trans isomers.
Working at a few millibars absolute lowers the volatiles' boiling points enough that stripping steam removes them at 240 to 260 degrees Celsius, which the triglycerides survive. The vacuum is not an economy of steam but the condition that makes the process possible at all.
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