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Tytuł pozycji:

Property Calculation and Prediction for Selecting Solvent Systems in CCC.

Tytuł :
Property Calculation and Prediction for Selecting Solvent Systems in CCC.
Autorzy :
Li, Zongcheng
Zhou, Yujie
Chen, Fuming
Zhang, Li
Yang, Yan
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Temat :
SOLVENTS
COUNTERCURRENT chromatography
CHROMATOGRAPHIC analysis
THERMODYNAMICS
LIQUIDS
Źródło :
Journal of Liquid Chromatography & Related Technologies; May2003, Vol. 26 Issue 9/10, p1397-1415, 19p, 6 Charts
Czasopismo naukowe
A theoretical method is presented for the property calculation and prediction in selecting solvent systems of countercurrent chromatography (CCC). A Universal Functional-group Activity Coefficients (UNIFAC) model is used as the solution model to describe the non-ideality of the liquid mixtures. The results are as follows. Thermodynamic criterion is given to judge the possibility of phase split. If the phase split takes place, calculation of phase composition is carried out. Calculate the volume ratio of the two immiscible phases in the system. Densities are calculated without considering the volumetric non-ideality. Viscosities are estimated by using the “cubic root summation.” Dielectric constants are obtained by using a semi-empirical mixing rule. Interfacial tension is also estimated by another semi-empirical equation. Compared with experimental data, the calculation results are satisfactory and accurate. A program is written for the computer calculation. Only the volume ratio of the solvents is needed for the input of the computation. A chosen system can be examined in a few minutes. If mobile phase (stationary as well) is wanted in the separation practice, there is no need to “equilibrate” the solvents, just “prepare” this phase of any desired quantity according to the result of calculation. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Liquid Chromatography & Related Technologies is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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