Glycerine is recovered from lye by ___________________?
Correct answer: C. Evaporation followed by vacuum distillation
- A. Extractive distillation technique
- B. Liquid extraction technique
- C. Evaporation followed by vacuum distillation
- D. None of these
Explanation
Lye from soap manufacture is first concentrated by evaporation, then glycerine is separated by vacuum distillation. Vacuum lowers the boiling temperature and limits thermal decomposition of glycerine.
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