FIELD: chemistry.
SUBSTANCE: invention refers to method of producing 1,3-propanediol by hydrogenation of 3-hydroxypropanal (versions). The first version of the method includes the stages as follows: (a) formation of aqueous 3-hydroxypropanal mixture, (b) delivery of aqueous mixture containing 3-hydroxypropanal through hydrogenation zone wherein it includes, at least, two stages with hydrogenation at the first stage performed at temperature 50 to 130°C with static bed of suspended in the presence of a motionless layer hydrogenation catalyst, and with at least, one of last stages involves adding acid cocatalyst, or acid cocatalyst is being chosen of the group consisting of acid zeolites, acid cation-exchange resins, acid or amphoteric metal oxides, heteropolyacids, and soluble acids chosen of the group consisting of mineral acids, phosphoric acid, acetic acid, propionic acid and 3-hydroxypropionic acid, herewith hydrogenation at the specified last stages is performed at higher temperatures, than at the first stage, within 70 to 155°C, to produce 1,3-propanediol aqueous solution; and (c) release of 1,3-propanediol specified.
EFFECT: invention makes enables effective reverse reaction with improved-yield transforming acetal by-products in 1,3-propanediol.
24 cl, 3 tbl, 18 ex
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