Theoretical Analysis of the Change in Ion Exchange Selectivity in the Complex Displacement Chromatography SystemsстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 26 июня 2019 г.
Аннотация:The ion exchange selectivity of complex displacement chromatography (CDC) is analyzed. It is
found that the separation factors determined by other means of complex chromatography, frontal and elution,
are not always interchangeable with CDC. A way of determining the separation factors applied to CDC is proposed. A technique for constructing isotherms for the ion exchange of components to be separated with the
simultaneous presence of displacer ions, hydrogen ions, and a sorbed complexone in the system is proposed
as well. The change in the selectivity towards different valence elements is considered. For protonated complexes, the complete inversion of selectivity corresponds to the transition of the S-shaped separation isotherm
from convex to concave. When protonated and binuclear М2А complexes are simultaneously present in a system, the inversion of selectivity is accompanied by mixed isotherms of variable type with two intersection
points with a diagonal. The spreading of the displacement fronts is determined using the McCabe–Thiele
approach. The lower part of the displacement front of the second component is spread in the case of a convex
isotherm with an S-shaped pattern. For complex isotherms with two maxima, the center of the front is spread,
while the lower and upper parts of the front are quite sharp.