NONLINEAR FREQUENCY RESPONSE OF A CHROMATOGRAPHIC COLUMN. PART I: APPLICATION TO ESTIMATION OF ADSORPTION ISOTHERMS WITH INFLECTION POINTS
NONLINEAR FREQUENCY RESPONSE OF A CHROMATOGRAPHIC COLUMN. PART I: APPLICATION TO ESTIMATION OF ADSORPTION ISOTHERMS WITH INFLECTION POINTS
复制标题
色谱柱的非线性频率响应。
DOI：
10.1080/009864490515865
复制
发表时间：
2005
影响因子：
2.5
通讯作者：
A. Seidel
中科院分区：
文献类型：
--
作者：
M. Petkovska;A. Seidel
摘要提出了一种测定吸附等温线的新方法。该方法基于对色谱柱的非线性频率响应的分析。由于分析中包含了高阶频率响应函数(FRF)，因此该方法特别适用于确定形状更复杂的等温线，例如具有拐点的等温线。通过对一阶、二阶和三阶吸附等温线的理论推导和分析，表明可以从低频渐近线估计相应吸附等温线的一阶、二阶和三阶导数。所给出的分析是针对单一组分的吸附。色谱柱的描述基于平衡-分散模型。文中还给出了考虑塔内传质速率有限的可能性的推广方法。
ABSTRACT A new method to determine adsorption isotherms is suggested. The method is based on analysis of the nonlinear frequency response of a chromatographic column. Due to the fact that higher order frequency response functions (FRFs) are included in the analysis, the method is in particular useful to determine isotherms with more complex shapes, e.g., isotherms possessing inflection points. By theoretical derivation of the first-, second-, and third-order FRFs and their analysis, it is shown that the first, second, and third derivatives of the corresponding adsorption isotherm can be estimated from the low frequency asymptotes. The analysis presented is made for the adsorption of a single component. The description of the chromatographic column is based on the equilibrium-dispersion model. The extension of the method considering the possibility of a finite mass transfer rate in the column is also presented.