Selective hydroxylation of phenol or phenolic ethers

Details Selective hydroxylation of phenol or phenolic ethers Selective hydroxylation of phenol or phenolic ethers

B - Operations, Transporting

01

J

B01J 27/18 (2006.01) B01J 27/16 (2006.01) C01B 25/37 (2006.01) C07C 37/60 (2006.01) C07C 39/08 (2006.01)

Patent

CA 2108124

2108124 9218449 PCTABS00016 Phenols, and related aromatic compounds, phenolic ethers, can be hydroxylated selectively using hydrogen peroxide in the presence of an amorphous or microcrystalline zirconium phosphate catalyst in a solvent containing an aliphatic carboxylic acid. The process is particularly suitable for phenol itself, and advantageously employs a partially dehydrated microcrystalline catalyst obtained by heating an hydrated microcrystalline zirconium phosphate for example at about 100 ·C. A convenient reaction temperature is 50 to 90 ·C, and convenient solvent is acetic acid. In an improved method of producing the catalyst, zirconium phosphate is precipitated from an aqueous phosphoric acid solution of zirconium oxychloride in the presence of a cationic phase transfer agent such as an alkylpyridinium salt or tetraalkylquaternary ammonium salt or a nonionic surfactant such as an alcohol ethoxylate.

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