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US 8,604,246 B2Granted
Single step catalytic preparation of para-aminophenol
AssigneesCentre National de la Recherche Scientifique (CNRS), Council of Scientific and Industrial Research, Vinati Organics Ltd (V.O.L.)
InventorsFrancois Figueras, Abhay Deshpande
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Abstract
The method of using a bi-functional catalyst for the one-step preparation of para-aminophenol. The catalyst includes a mixture of a hydrogenation noble metal and a zirconium sulfate. Also, an improved single-step process for the preparation of para-aminophenol from nitrobenzene, in an aqueous medium, using the bi-functional catalyst.
Claims20
A method of forming para-aminophenol in a one step reaction, comprising:
- performing hydrogenation of nitrobenzene to para-aminophenol in the presence of a bi-functional catalyst, wherein the bi-functional catalyst comprises a mixture of a hydrogenation noble metal and zirconium sulfate.
A process for the preparation of para-aminophenol comprising the following steps:
- A) contacting a mixture of nitrobenzene and water with a bi-functional catalyst comprising a mixture of a hydrogenation noble metal and zirconium sulfate;
- B) placing the reaction mixture under hydrogen pressure;
- C) allowing a reaction to take place;
- D) terminating the reaction to obtain a reaction mixture containing para-aminophenol;
- and
- E) isolating and recovering the para-aminophenol from the reaction mixture.
3 more elements
Dependencies are inferred from the claim text.