对氨基酚稀溶液的络合萃取

Extraction of P aminophenol Based on Chemical Complexation

络合萃取法分离极性有机物稀溶液具有高效性和高选择性。本文在原有工作的基础上，利用三正辛胺（ＴＯＡ）、磷酸三丁酯（ＴＢＰ）或Ｐ２０４为络合剂，正辛醇或煤油为稀释剂，在不同的ｐＨ值条件下实验测定了对氨基酚稀溶液的萃取相平衡分配系数。讨论了络合剂、稀释剂和溶液ｐＨ值等因素对于氨基酚稀溶液络合萃取分配系数的影响。提出了同时考虑络合萃取作用和物理萃取作用的分配系数的表达式。

The separation technique of extraction based on reversible chemical complexation can be high capacity and high selectivity for separating polar organic solutes from dilute solution. On the base of studying the extraction characteristics of organic acids and amines, p aminophenol is selected to be separated from dilute solution. By using TOA, TBPand D2EHPA as complexing agents, 1 octanol and kerosene as diluents, a series of extraction equilibrium experiments are carried out. The effects of complexing agent, diluents and pH value of aqueous solutions on distribution ratio D are discussed. A expression of equilibrium distribution ratio that includes chemical complexation and physical dissolution has been proposed simultaneously.