Trimerization of formaldehyde in the gas phase
AssigneeTicona LLC
InventorsHarald Werner, Elke Schweers, Frank Olschewski, Gerhard Geiss, Elfriede Hufsky, Helmut Tränkler, Heinz Alexander
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Abstract
A process for the gas-phase trimerization of formaldehyde to give trioxane using solid phosphoric acid catalysts. Particularly suitable catalysts for this process are SPA catalysts (solid phosphorous acid), for example “silicon phosphates”. The main advantage of this catalyst system is its simple and inexpensive production and ready availability and also, in particular, its improved long-term stability compared to the few previously described catalysts which are mostly based on supported heteropolyacids.
Claims12
A process for preparing trioxane, which comprises trimerizing gaseous formaldehyde having a low water content in a heterogeneously catalyzed gas-phase reaction using a solid phosphoric acid catalyst.
Dependencies are inferred from the claim text.