Glycerine is recovered from lye by ___________________?
Correct answer: A. Evaporation followed by vacuum distillation
- A. Evaporation followed by vacuum distillation
- B. Liquid extraction technique
- C. Extractive distillation technique
- 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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