Process for the production of trioxane from formaldehyde

C - Chemistry – Metallurgy – 07 – D

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C07D 323/06 (2006.01) B01D 3/00 (2006.01) B01J 8/04 (2006.01)

Patent

CA 2176581

A process for the trimerization of aqueous formaldehyde solution to produce trioxane in a multistage in situ catalyst reactor-extractor column containing a cationic exchange resin. The process entails countercurrent flow of formaldehyde solution and solvent across reactor and extractor stages wherein trioxane, produced from formaldehyde at the reactor stages, is subsequently separated at the extractor stages utilizing a suitable solvent.

La présente invention concerne un procédé de trimérisation d'une solution aqueuse de formaldéhyde pour produire du trioxanne dans une colonne réacteur-extracteur à plateaux étagés à catalyseur in situ contenant une résine d'échange cationique. Le procédé fait intervenir une circulation à contre-courant de la solution de formaldéhyde et du solvant par les plateaux du réacteur et de l'extracteur. Au cours de cette circulation, le trioxanne est produit à partir du formaldéhyde au niveau des plateaux du réacteur. Un solvant approprié permet ensuite de le séparer au niveau des plateaux de l'extracteur.

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