An isothermal high-pressure flow calorimeter the excess enthalpy of (cyclohexane + n-hexane) at different pressures at 288.15, 298.15, and 313.15 K

Abstract

An isothermal high-pressure flow calorimeter suitable for measuring enthalpy of mixing for endothermic and exothermic processes is described. The enthalpy of mixing can be measured from 263 K to 343 K and up to 40 MPa. With the present arrangement, energy effects from 0.005 to 0.5 J · s −1 can be measured with a precision of ± 1 per cent or better. Excess molar enthalpies H m E have been obtained for (cyclohexane + n-hexane) at 0.1, 15, and 30 MPa at different temperatures.