等温稀释型量热计的建立和过量焓的测定

The Cons truction of an Isothermal Displacement Calorimeter and the Deiermination of Excess Enthalpies

本文建立了一套等温稀释型量热计,该量热计可用于吸热型体系过量焓的测定,量热计灵敏度为2μV·J^(-1),恒温精度为±8×10^(-3)K.经环己烷-苯体系和环己烷-正己烷体系在298.15K时标定,精确度在1％以内,测定了缔合体系在乙醇-苯体系303.15K时溶液的过量焓。

An isothermal displacement calorimeter has been constructed. It allows the determination of excess enthalpies of mixing of endothermic liquid systems. The calorimeter was calibrated wish cyolohexane-benzene and cyclohexane-hexane systems at 298.15K. The pricision and accuracy are less than 1%. The excess enthalpy of ethanol-benzene system have been determinated at 303.15K.