中文摘要：

选用环己烷作稀释剂,在碱性条件下研究了丁酮对99 Tcm的萃取热力学性质。实验结果表明：相比（有机相/水相）和碱浓度对萃取率有明显影响,且萃取率随相比和碱浓度的增大而升高;在本实验条件下,萃取体系的平衡时间约8min;萃取过程为一放热反应,其中99 Tcm（Na99 TcmO4）与丁酮（CH3COC2H5）形成了配位数为1∶8～1∶9的萃合物Na99 TcmO4.qCH3COC2H5,q=8～9;最后计算了各温度下丁酮萃取99 Tcm的表观平衡常数和萃取反应的热力学函数值。

英文摘要：

The thermodynamics of solvent extraction of Tc with 2-butanone was investigated in the NaOH system using cyclohexane as the diluent. The results show that the ratio of organic and aqueous phase and the concentration of NaOH have obvious effect on the ratio of extraction, leading to the ratio of extraction increases with the phase ratio and the concentra- tion of NaOH. The extraction equilibrium is achieved within about 8 rain and the process is exothermic. Additionally, the apparent equilibrium constants and thermodynamic functions for the extraction process at different temperature were calculated.