Abstract The equilibrium solubility is the basis for purification and further theoretical studies of o-vanillin. In this paper, the solubility data of o-vanillin in three pure solvents, including water, ethanol, n-propanol, and two binary solvents of water + ethanol and water + n-propanol has been experimented under atmospheric pressure (p = 0.1 MPa) in the temperature range from 273.15 K to 303.15 K. The experimental results proved that the rising temperature leads to increased solubility of o-vanillin in all selected solvents. All the solubility data in different pure and binary solvents was correlated by the modified Apelblat equation. The computational values were in good agreement with the experimental results according to the calculations. In addition, some thermodynamic parameters of o-vanillin including dissolution enthalpy ( Δ H sol ), entropy ( Δ S sol ) and the Gibbs energy ( Δ G sol ) were obtained via the Van’t Hoff analysis. The positive values of Δ H sol and Δ G sol indicated that the dissolution process of o-vanillin is endothermic.

中文翻译：

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273.15 K 至 303.15 K 温度下 O-香草醛在不同纯和二元溶剂中溶解度的测量和相关性

摘要 平衡溶解度是邻香兰素纯化和进一步理论研究的基础。本文对邻香兰素在水、乙醇、正丙醇三种纯溶剂以及水+乙醇和水+正丙醇两种二元溶剂中的溶解度数据进行了常压实验（p=0.1 MPa）。 ) 在 273.15 K 到 303.15 K 的温度范围内。实验结果证明，升高的温度导致邻香兰素在所有选定溶剂中的溶解度增加。不同纯溶剂和二元溶剂中的所有溶解度数据都通过修改后的 Apelblat 方程相关联。根据计算，计算值与实验结果吻合良好。此外，邻香兰素的一些热力学参数包括溶解焓（ΔH sol ），熵 (Δ S sol ) 和吉布斯能 (Δ G sol ) 是通过范特霍夫分析获得的。Δ H sol 和Δ G sol 的正值表明邻香兰素的溶解过程是吸热的。