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单词 vacuum distillation
释义
vacuum distillation

Chemistry
  • Distillation under reduced pressure. The depression in the boiling point of the substance distilled means that the temperature is lower, which may prevent the substance from decomposing.


Chemical Engineering
  • A distillation process that operates at a reduced pressure. The effect of the low pressure is to reduce the boiling point temperature of the mixture being separated. This is useful where the materials may be heat-labile, such as the separation of volatiles from fruit juices, or prevent the decomposition or cracking of materials being distilled in crude oil distillation. In the vacuum distillation of petroleum fractions, residues may be used as the feedstock for cracking other products, or may be blended to produce fuel oil or asphalt. See molecular distillation.


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