作　　者： ; ;

机构地区： 清华大学化学工程系

出　　处： 《高校化学工程学报》 1994年第1期25-32,共8页

摘　　要： 本文建立了由磷酸氢二钾、磷酸二氢钾、聚乙二醇及水所组成的双水相体系（不含生物物质）的平衡浓度分析测定方法。实验共测定了ｐＨ＝９．４３及聚乙二醇数均分子量分别为１０００，２０００，４０００和６０００四种共４１组在２５℃下的液－液平衡数据；测定了聚乙二醇数均分子量为４０００和ｐＨ值分别为６、７、８时共３２组在２５℃下的液液平衡数据；实验还测定了Ｋ２ＨＰＯ４和ＫＨ２ＰＯ４在水中的缔合常数；用扩展的ＵＮＩＦＡＣ方程（短程项）和Ｆｏｗｌｅｒ－Ｇｕｇｇｅｎｈｅｉｍ方程（长程项）相结合进行了关联和预测，结果满意。同时还用Ｓｅｔｓｃｈｅｎｏｗ公式对双水相中上层贫盐水相进行关联，并发现此双水相体系遵循盐效应的一般规律。 The quantitative analysis method for the study on liquid-liquid equilibria(LLE) of K2HPO4-KH2PO4-PEG aqueous two-phase quaternary system was established. LLE data of four series of experiments composed of different molecular weight of PEG(1000, 2000, 4000 and 6000) with PH = 9. 43 and three series of experiments composed of different PH values (6,7 and 8)with PEG (4000) at 25 ℃ were determined. The assoctiation constants of K2HPO4 and KH2PO4 in water were also determined. The extended UNIFAC equation combined with the Fowler-Guggenheim equation are proposed for the correlation and prediction of LLE data. The results are satisfactory. The Setschenow equation is used to correlate the equilibrated upper aqueous phase with low concentration of salts. It shows that the aqueous two-phase system acts in accordance with the general law of salting effect.

关 键 词： 磷酸氢钾 聚乙二醇 水 液液平衡

领　　域： [理学] [理学]