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单词 azeotrope
释义
azeotrope

Physics
  • A mixture of two liquids that boils at constant composition; i.e. the composition of the vapour is the same as that of the liquid. Azeotropes occur because of deviations in Raoult’s law leading to a maximum or minimum in the boiling-point–composition diagram. When the mixture is boiled, the vapour initially has a higher proportion of one component than is present in the liquid, so the proportion of this in the liquid falls with time. Eventually, the maximum and minimum point is reached, at which the two liquids distil together without change in composition. The composition of an azeotrope depends on the pressure. Azeotropic distillation is a technique for separating the components of an azeotrope by adding a third substance that affects the volatility of one component more than the other.


Chemistry
  • A mixture of two liquids that boils at constant composition; i.e. the composition of the vapour is the same as that of the liquid. Azeotropes occur because of deviations in Raoult’s law leading to a maximum or minimum in the boiling-point-composition diagram. When the mixture is boiled, the vapour initially has a higher proportion of one component than is present in the liquid, so the proportion of this in the liquid falls with time. Eventually, the maximum and minimum point is reached, at which the two liquids distil together without change in composition. The composition of an azeotrope depends on the pressure.


Chemical Engineering
  • A mixture of two liquids that boils at a constant composition. That is, the composition of the vapour is the same as the composition of the liquid. It is therefore not possible to separate an azeotropic mixture by conventional distillation. Azeotropes occur due to deviations in Raoult’s law leading to either a maximum or minimum in the boiling point-composition diagram. The composition of the azeotrope is dependent on pressure.


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