Equilibrium Solubility and Mathematical Correlation of (2-Naphthylthio)acetic Acid in Four Aqueous Cosolvency Systems at 278.15–323.15 K,Journal of Chemical & Engineering Data

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Equilibrium Solubility and Mathematical Correlation of (2-Naphthylthio)acetic Acid in Four Aqueous Cosolvency Systems at 278.15–323.15 K
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2021-08-26 , DOI: 10.1021/acs.jced.1c00482
Guangyu Xu ₁ , Fanyuan Zhang ₁ , Zhenghui Li ₁

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Pure solvents are often single in nature and often cannot meet the dissolution requirements of (2-naphthylthio)acetic acid. The method of adding a solvent into another solvent to form a mixed solvent improves this situation. As a common solvent, water cannot dissolve the solute in this study well, so methanol was added into water to form a liquid mixture of different compositions. At first, the ratio of methanol mass is 90% and then decreases by 10% until the methanol content is 10%. According to the above method, ethanol, isopropanol, and N,N-dimethylformamide (DMF) are made into corresponding mixed solvents. Under a pressure of 101.2 kPa, the temperature of (2-naphthylthio)acetic acid and the solvent is kept at 278.15 K. Based on the basic principle of the static gravimetric method, the amount of solute diffusion in the above four mixed solvents is obtained. Other conditions remain unchanged, but the temperature increases by 5 K and the above steps are repeated until the temperature is 323.15 K. Generally speaking, there are two variables in the experiment, one is the temperature variable and the other is the organic solvent ratio variable. Other variables remain the same, but the temperature changes to a higher level, and more (2-naphthylthio)acetic acid can be detected in the solution. Regardless of the change in the temperature variable, the larger the mass of the organic solvent, the more the solute in the solution. The above rules are applicable to the four groups of mixed solvents, but under the same conditions, the combination of DMF and water is superior in terms of dissolution. The Jouyban–Acree model, van’t Hoff–Jouyban–Acree model, and modified Apelblat–Jouyban–Acree model were employed to correlate the obtained solubility. In all models, the relative average deviation (RAD) and root-mean-square deviation (RMSD) were not more than 5.30% and 6.40 × 10^–5, respectively. The poor water solubility not only makes the (2-naphthylthio)acetic acid production process more difficult but also suffers many limitations in application because it cannot be prepared into a liquid dosage form and is inconvenient to use on many occasions.

中文翻译：

(2-萘硫基)乙酸在四种水性共溶剂体系中的平衡溶解度和数学相关性在 278.15–323.15 K

纯溶剂往往性质单一，往往不能满足（2-萘硫基）乙酸的溶解要求。将一种溶剂加入另一种溶剂中形成混合溶剂的方法改善了这种情况。水作为一种常用溶剂，不能很好地溶解本研究中的溶质，因此将甲醇加入水中形成不同成分的液体混合物。首先，甲醇质量比为 90%，然后减少 10%，直到甲醇含量为 10%。根据上述方法，乙醇、异丙醇和N、N-二甲基甲酰胺（DMF）制成相应的混合溶剂。在101.2kPa压力下，(2-萘硫基)乙酸与溶剂的温度保持在278.15K。根据静态重量法的基本原理，得到上述四种混合溶剂中的溶质扩散量. 其他条件不变，但温度升高5 K，重复上述步骤，直到温度为323.15 K。一般来说，实验中有两个变量，一个是温度变量，另一个是有机溶剂比例变量. 其他变量保持不变，但温度变化到更高的水平，并且可以在溶液中检测到更多的（2-萘硫基）乙酸。无论温度变量如何变化，有机溶剂的质量越大，溶液中的溶质越多。上述规则适用于四组混合溶剂，但在相同条件下，DMF与水的组合在溶解性方面更优。Jouyban-Acree 模型、van't Hoff-Jouyban-Acree 模型和改进的 Apelblat-Jouyban-Acree 模型用于关联获得的溶解度。在所有模型中，相对平均偏差（RAD）和均方根偏差（RMSD）均不超过 5.30% 和 6.40 × 10^–5，分别。水溶性差，不仅使(2-萘硫基)乙酸的生产过程更加困难，而且由于不能制成液体剂型，在很多场合使用不方便，在应用上也受到诸多限制。

更新日期：2021-09-09

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