Removal of impurities formed during the production of...

C - Chemistry – Metallurgy – 07 – C

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C07C 29/141 (2006.01) C07C 29/80 (2006.01) C07C 29/88 (2006.01) C07C 31/20 (2006.01)

Patent

CA 2504378

This invention describes improvements upon a process for the production of 1,3- propanediol (PDO) wherein an aqueous solution of 3-hydroxypropanal (HPA) is formed and the HPA is subjected to hydrogenation to produce a crude PDO mixture. One improvement on this process comprises treating the crude PDO mixture with an acidic zeolite, an acid form cation exchange resin, or a soluble acid to convert the MW176 cyclic acetal to more volatile materials which can be easily separated from PDO by distillation. Another improvement involves removing water from the crude 1,3-propanediol mixture, contacting the resulting mixture with a solid acid purifier at a temperature of from about 50 to about 250 ~C to convert the MW 132 cyclic acetal to more volatile cyclic acetals, and separating the more volatile cyclic acetals from the 1,3- propanediol by distillation or gas stripping.

Cette invention concerne des améliorations sur un procédé de production de 1,3-propanediol (PDO) dans lequel une solution aqueuse de 3-hydroxypropanal (HPA) est formée, le HPA étant soumis à une hydrogénation afin de produire un mélange brut de PDO. Une amélioration de ce procédé consiste à traiter le mélange brut de PDO avec une zéolithe acide, une résine d'échange cationique sous forme acide, ou un acide soluble afin de convertir l'acétal cyclique MW176 en matériaux plus volatils pouvant facilement être séparés du PDO par distillation. Une autre amélioration consiste à éliminer l'eau du mélange brut de 1,3-propanediol, à contacter le mélange résultant avec un purificateur solide acide à une température allant d'environ 50 à environ 250 ·C afin de convertir l'acétal cyclique MW 132 en acétals cycliques plus volatils, et à séparer les acétals cycliques plus volatils du 1,3-propanediol par distillation ou par extraction liquide de gaz.

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