The extraction of silver by dodecylamine under neutral condition was studied. The extraction rates of silver at different temperatures and ionic strengths were calculated, and the optimum extraction factors were analyzed. The extraction rate decreases with increasing temperature, and the extraction rate can up to 98.79%. The physicochemical characters of the reaction such as the standard equilibrium constant K 0 , the change of enthalpy, entropy and Gibbs free energy were computed. Gibbs free energy, entropy, enthalpy and heat capacity increase with the decrease of temperature, which indicates that low temperature is beneficial to extraction reaction.

中文翻译：

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煤油中十二胺提取银的热力学研究

研究了十二胺在中性条件下提取银的工艺。计算了不同温度和离子强度下银的提取率，并分析了最佳提取因素。萃取率随温度升高而降低，萃取率可达98.79%。计算了反应的标准平衡常数K 0 、焓变、熵变和吉布斯自由能等物理化学性质。吉布斯自由能、熵、焓和热容随温度的降低而增加，说明低温有利于萃取反应。