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实验研究了几种不同的混合溶剂对丁二酸稀溶液的络合萃取，讨论了络合剂、稀释剂组成对相平衡分配系数的影响。实验结果表明，络合萃取法对羧酸稀溶液体系具有高效性。利用２０％三辛胺＋３０％正辛醇＋５０％煤油混合溶剂对丁二酸稀溶液进行萃取，具有相当高的分配系数值。同时，还讨论了叔胺类萃取剂对丁二酸萃取的过程机理，提出了同时存在离子缔合成盐和氢键缔合溶剂化两种历程。
The effects of complexing agent and diluent on the phase equilibrium partition coefficient were studied experimentally by the complex extraction of several different mixed solvents on the solution of succinic acid. The experimental results show that the complex extraction method is effective for dilute carboxylic acid system. Extraction of succinic acid with 20% trioctylamine + 30% n-octanol + 50% kerosene mixed solvent has a very high partition coefficient. At the same time, the mechanism of extraction of succinic acid by tertiary amine extractants was also discussed. Two processes of ionic association salt formation and hydrogen bonding association solvation were proposed.