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The solubility of 2,2′-(1,2-ethenediyldi-4,1-phenylene) bis-benzoxazole (OB-1) in four monosolvents (chlorobenzene, N-methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF), and water) and four di...

The solubilities of l-valine in four binary mixed solvents of water + (ethanol, isopropyl alcohol, N,N-dimethylformamide, acetone) were experimentally measured from 293.15 K to 343.15 K at atmospheric pressure by employing the synthetic method. The experimental data indicate that the solubility of l-valine in the binary mixed solvents increases with the increasing temperature and decreases with the rise of mass concentration (w) of nonaqueous solvent in the binary aqueous solution. The experimental data can be correlated by using the modified Apelblat model, λh model, and CNIBS/R-K model. The results indicate that the solubility data show agreement with the modified Apelblat model much better than others in the studied binary solvents system. The dissolution enthalpy, dissolution entropy, and molar Gibbs energy of the dissolution of l-valine in the studied binary mixed solvents were then calculated. The experimental data and the correlation equations in this work can be used as essential data and models i...

The solubilities of l-valine in water, ethanol, N,N-dimethylformamide, acetone, and isopropyl alcohol were experimentally measured by the synthetic method over the temperature range from (293.15 to 343.15) K at atmosphere pressure. The solubilities of l-valine in pure solvents increase with increasing temperature and in the following order: acetone < N,N-dimethylformamide < isopropyl alcohol < ethanol < water. The solubilities correlated using the modified Apelblat model show good agreement with the experimental data, and the dissolution enthalpy, dissolution entropy, and the molar Gibbs energy were predicted. The experimental solubilities and the modified Apelblat model can be used as essential data and model in the industrial manufacturing process of l-valine.