Process for the preparation of a phenol

Details Process for the preparation of a phenol Process for the preparation of a phenol

C - Chemistry, Metallurgy

07

C

C07C 39/04 (2006.01) C07C 37/56 (2006.01) C07C 201/12 (2006.01) C07C 205/21 (2006.01) C07C 213/00 (2006.01) C07C 215/76 (2006.01)

Patent

CA 2071108

(15) AE 7175 A B S T R A C T Process for the preparation of a phenol by an oxidative decarboxylation in the liquid phase of a corresponding arylcarboxylic acid in the presence of a Cu(I)-containing catalyst, characterized in that an oxidative decarboxylation is carried out at a temperature between 191-270°C, in the presence of water, with such an amount of oxygen being added that so much copper remains present as Cu(I) that a selectivity to phenol is obtained of more than 92% measured at 1 bar, and phenol is separated off. The oxidative decarboxylation is preferably carried out by: a) oxidation of the catalyst at a temperature of 191-240°C for at most 20 minutes, with such an amount of oxygen being added that at least 0.04 wt.% copper remains present as Cu(I); b) reaction of the oxidized catalyst of step a) and formation of the phenol in the absence of oxygen, in the presence of water, at a temperature of 210-270°C.

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