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AssigneeKorea Research Institute of Chemical Technology
InventorsSang Eon Park, Chul Wee Lee, Jong San Chang, Yong Ki Park
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The present invention relates to a process for preparing hydroxylated aromatics by using hydrogen and oxygen and more particularly, to a process for preparing hydroxylated aromatics by using hydrogen and oxygen with a two-component heterogeneous catalyst. One component consists of porous catalyst containing one of Group VIII B transition metals such as Pd, Pt, Au and Cu, and hydrogen transfer organic compounds such as anthraquinone. The other component consists of a catalyst containing a transition metal selected from Ti, V, and Sn with tetrahedral coordination geometry. The main advantages of this new catalytic system are to 1) overcome the drawbacks of liquid phase oxidation using conventional homogeneous catalysts, 2) avoid use of expensive hydrogen peroxide as an oxidant, and 3) improve the selectivity of the reaction.
A process for direct hydroxylation of an aromatic compound, comprising contacting an aromatic compound with at least one two-component heterogeneous catalyst comprising at least one zeolite catalyst which contains at least one Group VIII B transition metal and at least one alkyl anthraquinone or its derivative, and at least one zeolite catalyst which contains at least one transition metal with tetrhedral coordination geometry, wherein hydroxylation is performed using hydrogen and oxygen under atmospheric pressure and at a temperature ranging from −10 to 60° C.
A process for direct hydroxylation of an aromatic compound, comprising contacting an aromatic compound with at least one two-component heterogeneous catalyst comprising zeolite catalyst which contains at least one Group VIII B transition metal and at least one alkyl anthraquinone or its derivative, and at least one zeolite catalyst which contains tin with tetrhedral coordination geometry, wherein hydroxylation is performed using hydrogen and oxygen under atmospheric pressure and at a temperature ranging from −10 to 60° C.
Dependencies are inferred from the claim text.