1,4-丁二醇蒸馏底物解聚溶液组成的分析方法

The Analytical Method for the Composion of Depolymerization Solution of 1,4-Butanediol′s Distillation Substrate

使用液液萃取法分析溶液中的1,4-丁二醇(BDO)含量,正辛醇作为萃取剂,在30℃下测定了水-BDO-正辛醇三元液液相平衡数据。使用扩展型UNIQUAC模型建立了溶液中水-BDO-正辛醇的活度系数模型,关联该体系的液液平衡数据,通过单纯型法回归获得三元体系组分之间的相互作用能参数。实验数据以及计算结果表明,通过分析萃取相的组成,能可靠地预测萃余相的组成,进而得到原溶液中BDO的含量。该法准确、简便,可作为该体系的常规分析方法。

Liquid-liquid extraction（LLE） was used to analyze the contents of 1,4-butanediol （BDO） in the depolymerization solution. The LLE data for the system were measured at 30 ℃ when n-octanol was used as extracting reagent. Activity coefficient models were established to correlate the LLE data of the system using the Extended-UNIQUAC equation, in which the binary interaction energy parameters of water ＋ BDO ＋ n- octanol ternary system were obtained through a simplex fitting method. The results show that the composition of raffinate phase can be predicted reliably by analyzing the composition of extract phase. Therefore, the contents of BDO in the solution can be calculated. The method is accurate and simple and can be used as the common analytic method for this system.