A top formaldehyde feed concentration and a very low reaction temperature are one of the advantages of utilizing heteropolyacids (phosphotungstic acid and silicotungstic acid) as catalysts in the Trioxane Synthesis; this cyclic trimer of formaldehyde (see strategy ) is employed in the industrial production of acetal resins. In comparison to responses with a traditional catalyst, like sulfuric acid, trioxane could be produced in higher yield and with greater selectivity.
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