REMOVING IMPURITY FORMED IN PREPARING 1,3-PROPANEDIOL Russian patent published in 2008 - IPC C07C31/20 C07C29/141 C07C29/88 

FIELD: chemical technology.

SUBSTANCE: invention relates to a method for synthesis of 1,3-propanediol involving the following steps: (a) formation of aqueous solution of 3-hydroxypropanal; (b) hydrogenation of 3-hydroxypropanal to form crude mixture of 1,3-propanediol, water and cyclic acetal of molecular mass 132 Da (MW 132 cyclic acetal) and/or cyclic acetal of molecular mass 176 Da (MW 176 cyclic acetal); (c) distillation (drying) of indicated crude mixture of 1,3-propanediol for water removing and formation of the second crude mixture of 1,3-propanediol (the first flow of residues after distillation) containing 1,3-propanediol and MQ 132 cyclic acetal and/or MW 176 cyclic acetal; (d) contact of the flow containing MW 132 cyclic acetal and/or MW 176 cyclic acetal with acid-base cation-exchange resin or with acid zeolite, or with soluble acid, and (e) removal of MW 132 cyclic acetal. Method provides enhancing effectiveness for extraction and purification of 1,3-propanediol.

EFFECT: improved method of treatment.

10 cl, 9 tbl, 1 dwg, 6 ex