Carbon Dioxide → 4-Hydroxybenzoic Acid

Participants

Reaction Steps

In a pressure reaction vessel were charged 100 g of potassium phenolate, 35 g of phenol and 500 g of a mixture of hydrogenated triphenyls, and a reaction was allowed to proceed at 250° C. and at a carbon dioxide pressure of 7 kg/cm2 (G) for 20 minutes, with stirring. The reaction mixture was cooled and charged into 200 ml of water, followed by separation into the reaction medium layer and the water layer at 60° C. The water layer was made acid with dilute sulfuric acid to give 81.6 g of p-hydroxybenzoic acid (having a purity of 99%). The yield based on potassium phenolate was 77.3%, and the recovered potassium phenolate was 21.0 g, with the selectivity being 99.7%.

Provenance & Evidence