C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/511
C07C 63/26 (2006.01)
Patent
CA 1120056
?-77 /js PROCESS FOR PRODUCING ISOMERIZED AROMATIC CARBOXYLIC ACIDS AND TEREPHTHALIC ACID ABSTRACT Isomerized aromatic carboxylic acid is produced from benzoic acid and another aromatic material by treating a mixture of an aromatic material, water, and a water soluble reagent comprising a Group Ia or IIa metal, the reagent producing an alkaline solution by hydrolysis, with oxygen, under conditions sufficient to convert at least a portion of the aromatic material to an aromatic carboxylic acid salt of the metal of the reagent; adding benzoic acid to the mixture; and isomerizing the aromatic carboxylic acid salt by heating without converting the aromatic carboxylic acid salt to an aromatic carboxylic acid salt of a different Group Ia or IIa metal prior to isomerizing. The isomerized aromatic carboxylic acid salt is then converted to isomerized aromatic carboxylic acid and the reagent is regenerated. The isomerized aromatic carboxylic acid is recovered and the reagent is recycled to supply a portion of the reagent required for producing said aromatic carboxylic acid salt. In an alternate embodiment, the benzoic acid is added to the mixture and is in the mixture while the mixture is treated with oxygen and the soluble reagent. In another embodiment, the water soluble reagent comprises a Group Ia or IIa metal formate, acetate, or propionate. - 1 - In another embodiment, the isomerized aromatic carboxylic acid salt is treated with an acid of the reagent to convert the isomerized aromatic carboxylic acid salt to an isomerized aromatic carboxylic acid precipitate and the reagent. In another embodiment, the water soluble reagent is potassium carbonate, or potassium bicarbonate or mixtures thereof. The invention is especially useful for producing tereph- thalic acid.
322877
Dolbear Geoffrey E.
Schep Raymond A.
Occidental Research Corporation
Smart & Biggar
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