A process for the production of alkylene oxide using a...

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 301/10 (2006.01)

Patent

CA 2540563

An improved process for the manufacture of ethylene oxide through the epoxidation of ethylene using a catalyst comprising silver and at least one efficiency-enhancing salt of a member of a redox-half reaction pair. Added to the epoxidation reaction is a two-component gas-phase promoter system comprising a chlorine-containing component (for example ethyl chloride, methyl chloride, vinyl chloride and ethylene dichloride), and a nitrogen-containing component of nitric oxide and other compounds capable of generating under reaction conditions at least one gaseous efficiency-enhancing member of a redox-half reaction pair comprising NO, NO2, N2O3 or N2O4. The amount of each component of said gaseous promoter is adjusted to maintain the ration of N* to Z* less than or equal to 1 wherein, N* is the nitric oxide equivalent in ppmv, ranging from 1 to 20 ppmv and Z* =ethyl chloride equivalent (ppmv) * 100 percent / ethane equivalent (mol percent) * 100 ranging from 5 to 40 ppmv.

L'invention se rapporte à un procédé amélioré de fabrication d'oxyde d'éthylène par époxydation d'éthylène au moyen d'un catalyseur contant de l'argent et au moins un sel qui améliore l'efficacité d'un élément d'une paire de demi-réaction d'oxydoréduction. Un système promoteur en phase gazeuse à deux composés est ajouté à la réaction d'époxydation. Ce système comprend un composé contenant du chlore (par exemple du chloroéthane, du chlorométhane, du chloroéthène et du dichlorure d'éthylène), et un composé d'oxyde nitrique contenant de l'azote, ainsi que d'autres composés pouvant générer, dans des conditions de réaction, au moins un élément gazeux qui améliore l'efficacité d'une paire de demi-réaction d'oxydoréduction contenant NO, NO¿2?, N¿2?O¿3? or N¿2?O¿4?. La quantité de chaque composé du promoteur gazeux est réglée de manière à conserver un rapport N*/Z* inférieur ou égal à 1, N* étant l'équivalent d'oxyde nitrique en ppmv, compris entre 1 à 20 ppmv et Z* = équivalent de chloroéthane (ppmv) * 100 pour cent / équivalent d'éthane (pourcentage par mole) * 100 compris entre 5 et 40 ppmv.

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