| 摘要 |
Process for producing isophthalic acid by direct oxidation of m-toluic acid or a mixture of m-toluic acid with m-xylene and partially oxidized intermediates under mild conditions without the presence of consumable organic solvents or corrosive bromine promoters comprising forming a homogeneous, aqueous mixture of said substrate containing from 10 to 80 weight percent water and an active catalyst comprising a manganese compound or a mixture of a maganese compound and a cobalt compound, the minimum concentration (M) of catalyst in said mixture in millimoles per kilogram of mixture being given by the equation <IMAGE> wherein x is the mole fraction of maganese in the catalyst, y is the mole ratio of water to m-toluic acid and z is the ratio of dissolved isophthalic acid to m-toluic acid, the maximum concentration of catalyst being not more than about 40 millimoles catalyst per kilogram of mixture and reacting said substrate with a molecular oxygen-containing gas at a temperature from about 140 DEG to 220 DEG C. and a pressure sufficient to maintain water in the liquid phase.
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