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Solubility of NaHCO3 in Systems of Aqueous Glycols (Monoethylene Glycol, Diethylene Glycol, Triethylene Glycol, and Tetraethylene Glycol): The Role of Solvation
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-11-12 , DOI: 10.1021/acs.jced.0c00538
Randi Neerup 1 , Sebastian N. B. Villadsen 1 , Kaj Thomsen 1 , Philip L. Fosbøl 1
Affiliation  

The solubility and density of NaHCO3 in the systems: monoethylene glycol (MEG)–water, diethylene glycol (DEG)–water, triethylene glycol (TEG)–water, and tetraethylene glycol (TeEG)–water have been measured over the entire concentration range from pure water to pure glycol. Experimental measurements have been conducted at the temperatures 5, 20, 40, and 60 °C and at atmospheric pressure. The solubility of NaHCO3 in all glycol mixtures increases with increasing temperatures. Solubility is largest in aqueous MEG and decreases with the higher molecular weights of glycol used. Local minima were observed in all systems in the concentration range 80–90 wt % glycol, salt-free. On a mole fraction scale, minima were found at x(glycol, salt-free) = 0.5. There is a clear tendency that two solvate mechanisms exist with a 1:1 solvation relation. One type of solvation is formed in NaHCO3–water, and a second type is formed in NaHCO3–glycol. The density results showed a linear increase up to a glycol concentration ≈80 wt %. Above 80 wt %, the density seemed to form a minima similar to the solubility phase diagrams.

中文翻译:

NaHCO 3在乙二醇体系中的溶解度(单乙二醇,二乙二醇,三乙二醇和四乙二醇):溶剂化的作用

NaHCO 3在以下系统中的溶解度和密度:已测量了整个浓度下的单乙二醇(MEG)-水,二甘醇(DEG)-水,三甘醇(TEG)-水和四甘醇(TeEG)-水从纯净水到纯乙二醇。实验测量是在5、20、40和60°C的温度以及大气压下进行的。NaHCO 3在所有乙二醇混合物中的溶解度随温度升高而增加。在MEG水溶液中的溶解度最大,并且随着所用乙二醇分子量的增加而降低。在所有系统中观察到的局部最小值在浓度范围为80–90 wt%的无盐乙二醇中。在摩尔分数范围内,在x处发现最小值(乙二醇,无盐)= 0.5。明显的趋势是存在两种溶剂化机理,它们之间具有1:1的溶剂化关系。在NaHCO 3-水中形成一种溶剂化形式,在NaHCO 3-乙二醇中形成第二种溶剂化形式。密度结果显示线性增加,直到乙二醇浓度≈80wt%。高于80重量%,密度似乎形成类似于溶解度相图的最小值。
更新日期:2021-01-14
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