[EN] METHOD OF PRODUCING ACETOXYARYL CARBOXYLIC ACIDS<br/>[FR] PROCEDE DE PRODUCTION D'ACIDES CARBOXYLIQUES D'ACETOXYARYLE
申请人:EASTMAN CHEM CO
公开号:WO2000027787A1
公开(公告)日:2000-05-18
A method of producing an acetoxyaryl carboxylic acid converts a dialkylaryl to a monohydroperoxide of the dialkylaryl, converts the monohydroperoxide of the dialkylaryl to an alkylaryl acetate, and oxidizes the alkylaryl acetate to the acetoxyaryl carboxylic acid in the presence of cobalt and bromine catalysts. If the alkyl groups are isopropyl groups, the method converts a monohydroperoxide of a diisopropylaryl to an isopropylaryl acetate and oxidizes the isopropylaryl acetate to the acetoxyaryl carboxylic acid in the presence of cobalt and bromine catalysts. Alternatively, it is possible to produce the acetoxyaryl carboxylic acid from an isopropylaryl alcohol. In this case, the isopropylaryl alcohol is converted to an isopropylaryl acetate and the isopropylaryl acetate is oxidized to the acetoxyaryl carboxylic acid in the presence of cobalt and bromine catalysts. The isopropylaryl acetate may be isolated prior to the oxidation step. Alternatively, the isopropylaryl acetate may not be isolated prior to the oxidation substep. However, acetone is produced in the step of converting the monohydroperoxide of the diisopropylaryl to the isopropylaryl acetate, and the acetone should be removed prior to the oxidation step. The aryl group may be a phenyl group or a naphthyl group. The oxidation step may be conducted in the presence of cobalt, bromine and manganese catalysts and more preferably in the presence of cobalt, bromine, manganese and potassium catalysts. The cobalt concentration should be within the range of from 0.01 molar to 0.05 molar and more preferably within the range of from 0.02 molar to 0.03 molar.