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US 5,508,448 AGranted
Process for the preparation of trioxane
AssigneeHoechst Aktiengesellschaft
InventorsGerhard Emig, Benno Kruger, Frank Kern, Michael Hoffmockel, Karl-Friedrich Muck, Gunter Sextro
Life of this patent
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Abstract
A process for the catalytic preparation of trioxane from formaldehyde in the gas phase employs a catalyst comprising vanadyl hydrogenphosphate hemihydrate which may be unactivated or activated by steam. No byproducts were obtained in the process and the space-time yield is high. Deposits in the reactor do not occur.
Claims20
A process for the preparation of trioxane from formaldehyde in the gas phase, which process comprises:
- contacting the formaldehyde in the gas phase with a solid catalyst comprising vanadyl hydrogenphosphate hemihydrate.
A process for the preparation of trioxane from formaldehyde in the gas phase, which process comprises:
- treating solid, particulate vanadyl hydrogenphosphate hemihydrate with steam to activate it, and
- contacting the formaldehyde in the gas phase with the thus-activated solid, particulate vanadyl hydrogenphosphate hemihydrate, employed as a catalyst for converting the formaldehyde to trioxane.
Dependencies are inferred from the claim text.