Abstract: An integrated process for manufacture of trimellitic acid anhydride by the steps of catalytic oxidation of pseudocumene in the presence of acetic acid in an oxidation zone wherein liquid-phase conditions are mantained, cooling the oxidation reaction effluent to crystallize trimellitic acid, separating and recovering crystallized trimellitic acid, conducting the thermal conversion of the trimellitic acid to its anhydride continuously in two series staged dehydration zones and evaporating acetic acid solvent and hydrocarbon. Vapor from the first dehydration zone and the acetic acid mother liquor are combined as feed for distilling acetic acid and water mixture therefrom leaving a residue having high melting solids. The residue is combined with a bottom fraction from distillation of trimellitic anhydride product having catalyst metals and the combined material is added to the first dehydration zone in an amount of up to about 50 weight percent of the combined residue and bottom fraction.

Abstract: A process for the oxidation of pseudocumene to trimellitic acid anhydride is disclosed which comprises catalytic oxidation of pseudocumene with air in the presence of acetic acid in an oxidation zone in the liquid phase wherein the weight ratio of acetic acid to pseudocumene is in the range of about 0.5-4.0:1.0 and the catalyst comprises one or more heavy metal oxidation catalysts comprising zirconium, cobalt, and manganese to provide about 0.1 to about 0.4 weight percent total metals based on pseudocumene and a source of bromine. The addition of the bromine component is controlled to provide a total of about 0.10 to about 0.30 weight percent total bromine based on pseudocumene. The total weight ratio of bromine ions to total metals ions is about 0.5 to about 2.0. The zirconium content is about 1 to about 5% and the manganese content is about 14 to about 60% each by weight of the total metals. The reaction temperature is about 100.degree. C. to about 250.degree. C.

Abstract: A process for the oxidation of pseudocumene to trimellitic acid anhydride which comprises catalytic oxidation of pseudocumene with air in the presence of acetic acid in an oxidation zone in the liquid phase and wherein the weight ratio of acetic acid to pseudocumene is in the range of about 1.0-2.5:1.0 and the catalyst comprises one or more heavy metal oxidation catalysts comprising zirconium, cobalt and manganese to provide about 0.2 to about 0.4 weight percent total metals based on pseudocumene and a source of bromine. The addition of the bromine component is controlled to provide a total of about 0.10 to about 0.30 weight percent total bromine based on pseudocumene. The total weight ratio of bromide ions to total metals ions is about 0.7 to about 2.0. The zirconium content is about 1 to about 5% and manganese content is about 14 to about 24% each by weight of the total metals. The reaction temperature is about 100.degree. C. to about 250.degree. C.