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冰醋酸和水不存在共沸点。
下面是维基百科全书的有关段落：
有时共沸点在分离共沸物时很有用。一个例子是醋酸和水。它们不形成共沸物，尽管单用蒸馏法从醋酸和水的混合物中分离醋酸（沸点118.1C）很困难。非常不经济。
但是乙酸乙酯和水可以组成共沸物，共沸点70.4°C。加入乙酸乙酯作为共沸剂，就可以将这种乙酸乙酯和水的共沸物蒸去，而留下几乎是纯净的冰醋酸。
英文（见参考文献）：
Sometimes azeotropes are useful in separating zeotropic mixtures. An example is acetic acid and water, which do not form an azeotrope. Despite this it is very difficult to separate pure acetic acid (boiling point: 118.1°C) from a solution of acetic acid and water by distillation alone. As progressive distillations produce solutions with less and less water, each further distillation becomes less effective at removing the remaining water. Distilling the solution to dry acetic acid is therefore economically impractical. But ethyl acetate forms an azeotrope with water that boils at 70.4°C. By adding ethyl acetate as an entrainer, it is possible to distill away the azeotrope and leave nearly pure acetic acid as the residue.
参考文献：http://en.wikipedia.org/wiki/Azeotrope
下面是维基百科全书的有关段落：
有时共沸点在分离共沸物时很有用。一个例子是醋酸和水。它们不形成共沸物，尽管单用蒸馏法从醋酸和水的混合物中分离醋酸（沸点118.1C）很困难。非常不经济。
但是乙酸乙酯和水可以组成共沸物，共沸点70.4°C。加入乙酸乙酯作为共沸剂，就可以将这种乙酸乙酯和水的共沸物蒸去，而留下几乎是纯净的冰醋酸。
英文（见参考文献）：
Sometimes azeotropes are useful in separating zeotropic mixtures. An example is acetic acid and water, which do not form an azeotrope. Despite this it is very difficult to separate pure acetic acid (boiling point: 118.1°C) from a solution of acetic acid and water by distillation alone. As progressive distillations produce solutions with less and less water, each further distillation becomes less effective at removing the remaining water. Distilling the solution to dry acetic acid is therefore economically impractical. But ethyl acetate forms an azeotrope with water that boils at 70.4°C. By adding ethyl acetate as an entrainer, it is possible to distill away the azeotrope and leave nearly pure acetic acid as the residue.
参考文献：http://en.wikipedia.org/wiki/Azeotrope
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