分离易挥发的化学物质的蒸馏法，其中生成物被收集在一系列单独的馏分里，每种馏分的沸点都比未分馏前高。
Distillation to separate volatile chemical substances in which the products are collected in a series of separate fractions, each with a higher boiling point than the previous fraction.
最广泛使用的介质可能一般采用瓦斯油沸程内的高沸点石油馏分。
Probably the most widely used medium is a high-boiling petroleum fraction, usually in the gas-oil range.
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