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The binary system of vitamin K3 and CO2 was investigated at temperatures of 40, 60 and 80 °C up to a pressure of 40 MPa. Solubility was measured by a static-analytic method. Partial molar volumes were determined by a method involving a vibrating tube densimeter. The solubility of vitamin K3 in CO2 is found as a function of pressure and temperature. The highest solubility (31.16×10 mol∙mol) was attained at a pressure of 25.40 MPa at temperature of 40 °C. However, at temperature of 60 °C and a pressure of 24.02 MPa, the solubility was 18.79×10 mol∙mol. Solubility was lower at a temperature of 80 °C and a pressure of 22.06 MPa (6.48×10 mol∙mol). The partial molar volumes are negative and the dissolved vitamin K3 has a minor impact on the density of the solution of K3 in CO2 compared to the density of the pure CO2.

Investigation of the thermodynamic properties of the binary system vitamin K3/carbon dioxide