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AssigneeEastman Chemical Company
InventorsDavid Milton Lange, Ashfaq Shahanawaz Shaikh, Patrice L. Riesenberg, Mesfin Ejerssa Janka
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Processes for producing terephthalic acid are disclosed, the processes including a step of combining in a reaction medium para-xylene, a solvent comprising water and a saturated organic acid having from 2-4 carbon atoms, and an oxygen-containing gas, at a temperature for example from about 145° C. to about 175° C., in the presence of a catalyst composition comprising cobalt, manganese, zirconium, and bromine, wherein the zirconium is present in the reaction medium in an amount, for example, from 1 ppm to 50 ppm with respect to the weight of the liquid in the reaction medium.
A process for producing terephthalic acid, the process comprising combining in a reaction medium para-xylene, a solvent comprising water and a saturated organic acid having from 2-4 carbon atoms, and an oxygen-containing gas, at a temperature from about 145° C. to about 175° C., in the presence of a catalyst composition comprising cobalt, manganese, zirconium, and bromine, wherein the zirconium is present in the reaction medium in an amount from about 1 ppm to 50 ppm, with respect to the weight of the liquid in the reaction medium.
Dependencies are inferred from the claim text.