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A pressure vessel was charged with 6.65 grams of potassium phenolate and 7.40 grams of potassium ortho-cresolate both in dry powder form. With stirring, reaction was carried out at a carbon dioxide pressure of 7 kg/cm2 (G) and 220° to 240° C. for ten minutes. The equimolar mixture of potassium phenolate and potassium ortho-cresolate has a eutectic point of 209° C. in peak value as measured by differential thermal analysis (same throughout the examples). An analysis of the product at the end of reaction showed a para-hydroxybenzoic acid yield of 79.6% on the basis of the potassium phenolate.

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2. customa eutectic point of 209° C.
3. customAn analysis of the product at the end of reaction