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The solid-liquid equilibrium of benzoic acid derivatives in 1-octanol was first determined in this article. Using a laser monitoring observation technique,the solubility data of o-amino-benzoic acid,p-amino-benzoic acid, o-chloro-benzoic acid,and m-nitro-benzoic acid in 1-octanol were measured by the polythermal method in the temperature range of 20—50℃.The experimental data were regressed with the Wilson equation and theλH equa-tion.The experimental results showed that the solubility of the four chemicals in 1-octanol increased significantly with temperature.The results indicate that the molecular structure and interactions affect the solubility significantly. The solubility order of the benzoic acid derivatives is as follows:m-nitro-benzoic acid>o-chloro-benzoic acid> o-amino-benzoic acid>p-amino-benzoic acid.Both the Wilson equation andλH equation are in good agreement with the experimental data.
The solid-liquid equilibrium of benzoic acid derivatives in 1-octanol was first determined in this article. Using a laser monitoring observation technique, the solubility data of o-amino-benzoic acid, p-amino- benzoic acid, o-chloro-benzoic acid, and m-nitro-benzoic acid in 1-octanol were measured by the polythermal method in the temperature range of 20-50 ° C. The experimental data were regressed with the Wilson equation and the λH equa- tion. the experimental results showed that the solubility of the four chemicals in 1-octanol increased significantly with temperature. The results indicate that the molecular structure and interactions affect the solubility significantly. The solubility order of the benzoic acid derivatives is as follows: m-nitro-benzoic acid> o-chloro -benzoic acid> o-amino-benzoic acid> p-amino-benzoic acid. Both the Wilson equation and λH equation are in good agreement with the experimental data.