In batch distillation, the composition of the source material, the vapors of the distilling compounds and the distillate change during the distillation.
间歇式蒸馏时，原料的成分、所蒸馏的化合物的蒸汽及蒸馏物在蒸馏过程中是变化的。
In fractional distillation, that part of the distillate which may be returned to the column to assist in making a better separation into desired fractions.
在分馏中被送回塔内促进更好分离成所需馏分的那部分馏分油。
The components of the hydrochloric and the fire_retardant in the distillate and distillation residue were analysed after the waste water was distilled .
同时分析了将姑废水简单蒸馏后馏出液及釜液中盐酸和阻燃剂的含量。
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