芳香酸稀溶液的络合萃取研究
STUDY ON EXTRACTION OF AROMATIC ACID BASED ON CHEMICAL COMPLEXATION
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摘要: 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.本文利用三辛胺(TOA)或磷酸三丁酯(TBP)为络合剂,四氯化碳、三氯甲烷、正辛醇或煤油为稀释剂,实验测定了苯甲酸、邻硝基苯甲酸稀溶液的萃取相平衡分配系数,讨论了影响因素.实验测定了TOA在不同稀释剂中的表观碱度.提出了同时考虑络合萃取作用和物理萃取作用的平衡分配系数的表达式.Abstract: 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. In this paper, benzoic acid and o-nitrylbenzoic acid are selected to be separated from dilute solution. By using TOA and TBP as complexing agents, carbon tetrachloride, trichloromethane, l-octanol and kerosene as diluents, a series of extraction equilibrium experiments are carried out. The effects of complexing agent and diluents on distribution ratio D are discussed. Much work has been done on the apparent base strength of TOA in different diluents. An expression of equilibrium distribution ratio that includes chemical complexation and physical dissolution simultaneously has been proposed.
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