Azeotrope

Japanese: アゼオトロープ
Azeotrope
Also called an azeotrope. When the chemical composition of the liquid and gas phases in equilibrium is the same, the liquid in this mixture is called an azeotrope. Normally, when a mixture is distilled, the lowest boiling point evaporates first, so the purity can be increased, but this is not possible with an azeotrope. In the ethanol-water system, the mixture becomes azeotropic when the water content is 4.0%, so the water content cannot be reduced below this level by distillation.

Source: Asakura Publishing Nutrition and Biochemistry Dictionary Information

Japanese:
共沸混合物ともいう.平衡状態にある液相と気相の化学的組成が同じである場合,この混合物としての液体.普通混合物を蒸留すると沸点の低いものから蒸発するため,純度を上げることができるが,アゼオトロープではこれができない.エタノール-水系では,水が4.0%のときアゼオトロープとなるため,蒸留によってはこれ以下の水含量にすることができない.

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