论文部分内容阅读
研究了氯化三烷基甲基铵 N_(7402)煤油溶液从盐酸介质中萃取铂(Ⅳ)的平衡.考察了酸度、萃取剂浓度和温度等因素对铂萃取的影响;用饱和法、摩尔比法、等摩尔系列法和斜率法确定萃合物的组成为(R_3NCH_3)_2PtCl_6;并通过紫外可见光谱证实该萃取过程属于阴离子交换机理,测得表观萃取平衡常数 K_(ex)=158.6,变△H=0.154kJ·mol~(-1),自由能变△G=-12.55kJ·mol~(-1),熵变△S=41.60J·mol~(-1)·K~(-1)。
The equilibrium of extraction of platinum (Ⅳ) from hydrochloric acid was investigated by using trialkyl methyl ammonium chloride (N-7402) kerosene solution. The effects of acidity, extractant concentration and temperature on the extraction of platinum were investigated. (R_3NCH_3) _2PtCl_6 was determined by the equimolar series method and the slope method. The UV-visible spectrum confirmed that the extraction process belongs to the anion exchange mechanism and the apparent equilibrium constant of extraction K_ (ex) was 158.6, The change of △ H = 0.154kJ · mol -1, the change of free energy △ G = -12.55kJ · mol -1, the entropy change △ S = 41.60J · mol -1 K ~ (- 1).