solubility;  Benzoic acid;  laser monitoring technology;  Solubility model

In order to recover and purify the benzoic acid in the oxidation residue of PTA, the solubility of benzoic acid in chloroform, N,N-dimethylformamide, N,N-dimethylacetamide and N-methylpyrrolidone was determined by synthesis by laser monitoring technology. In order to verify the reliability of the determination method, the solubility of benzoic acid in water and acetic acid was determined in advance, and the consistency was better than that of the existing literature data. The solubility model proposed by Apelblat et al. was used to correlate the experimental data, and the calculated solubility was in good agreement with the experimental value.