Process for the preparation of 1,3-propanediol

Details Process for the preparation of 1,3-propanediol Process for the preparation of 1,3-propanediol

C - Chemistry, Metallurgy

07

C

C07C 31/20 (2006.01) C07C 29/141 (2006.01) C07C 29/80 (2006.01) C07C 45/64 (2006.01)

Patent

CA 2100229

1,3-propanediol (PD) is obtained by hydration of acrolein to 3-hydroxypropionaldehyde (HPA) with subsequent catalytic hydrogenation. 4-oxa-1,7-heptanediol (OD) occurs as a yield-reducing by-product. According to the invention, in order to increase the 1,3-propanediol yield, the OD which is separated by distillation during working-up of the reaction mixture containing PD and OD is treated in aqueous solution at from 100 to 300°C with an acid solid catalyst, in particular an acid zeolite, and the reaction mixture from which the solid catalyst has been removed is returned into the working-up stage of the reaction mixture containing PD and OD.

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