FIELD: industrial organic synthesis.
SUBSTANCE: invention provides a method for purifying 1,3-propanediol comprising: (a) optional removal of water from raw mix containing 1,3-propanediol; (b) distillation of raw mix containing 1,3-propanediol in distillation column under conditions favoring maximum separation of mix components, which are heavier than 1,3-propanediol, from 1,3-propanediol and components, which are lighter than 1,3-propanediol; (c) withdrawal of stream containing at least major part of 1,3-propanediol and at least some components, which are lighter than 1,3-propanediol; (d) separation of stream from step (c) from components, which are heavier than 1,3-propanediol; and (e) distillation of stream from step (c) in distillation column to separate 1,3-propanediol from components of stream, which are lighter than 1,3-propanediol, and any residual components heavier than 1,3-propanediol.
EFFECT: enhanced purification efficiency.
10 cl, 3 dwg, 2 ex
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