The Solubility of Salicylic Acid in Supercritical Carbon Dioxide

The possibility of using the method of supercritical fluid extraction for purifying the product of synthesis of salicylic acid is revealed and confirmed experimentally. A continuous-flow experimental setup is used to investigate the solubility of salicylic acid and phenol in supercritical $\text{CO}_2$ and to purify the product of synthesis of salicylic acid at a temperature of $308$ K in the pressure range from $7.8$ to $12$ MPa. The salicylic acid content of the resultant product conforms to the requirements of the State Pharmacopoeia.