What are the solubility properties of various compounds in propylene glycols?
Glycols, like all low-molecular-weight alcohols, are soluble in all proportions in water. In addition, many water-immiscible materials can be carried into clear water solutions by means of the coupling action of glycols. As a general rule, propylene glycol is a better solvent for oils and organic chemicals than ethylene glycol. DPG and TPG show greater solvency than MPG. Tripropylene glycol, for example, has the most extensive solvent properties of the entire glycol group. This relationship is well demonstrated in the following table, which illustrates the relative solvent properties of glycols for a number of oils and other organic substances. Saturated hydrocarbon oils are virtually insoluble in these glycols. Ester or acid type oils and gums are soluble to some extent in all glycols but are most soluble in tripropylene glycol. Aromatic compounds in general have appreciable solubility in glycols. Alcohols and aromatic hydroxy compounds, such as phenols and resorcinol, are readily sol
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