Deep eutectic solvents are a newer alternative to ionic liquids, as they have similar characteristics, but their preparation is less complex and cheaper, so they are increasingly used, especially in the pharmaceutical industry. Their good feature is also that they are more environmentally friendly.
In this work, the results of measuring freezing points, density and viscosity of five eutectic solvents L-menthol and octanoic acid were presented. L-menthol/octanoic acid eutectic solvents were prepared with molar ratios of 1:3, 1:2, 1:1, 2:1 and 3:1 and their density and viscosity were measured at temperatures between 5 °C and 55 °C, with an interval of 10 °C. In addition, for comparison at higher temperatures (35 °C, 45 °C, 55 °C), I also performed measurements for both pure components. I presented the results in the form of tables and graphs.
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