Absence of experimental evidence of a delta-shock in the system Phenetole (cas 103-73-1) and 4-tert-butylphenol on Zorbax 300SB-C18

Add time:08/14/2019    Source:sciencedirect.com

We investigate the system consisting of Phenetole (cas 103-73-1) (PNT) and 4-tert-butylphenol (TBP) in methanol–water (63:37 v:v) on a Zorbax 300SB-C18 column by characterising single component isotherms, by performing a large number of binary experiments of different types and by describing the experiments through simulations carried out using a novel, rather powerful competitive adsorption isotherm, that we call the generalized bi-Langmuir isotherm. This system is of great interest because it was previously reported to yield a new type of transition in nonlinear chromatography, the so-called delta-shock. Such transition had been discovered earlier through a theoretical analysis and confirmed by detailed simulations. The initial aim of this work was to reach a satisfactory agreement between delta-shock experiments and corresponding numerical simulations. In the course of this work however, a number of inconsistencies in the interpretation of the previous experimental results were highlighted and explained. This led to a new experimental campaign, which is reported here and has allowed to reach two important conclusions: (1) The binary system PNT–TBP mentioned above does not exhibit a delta-shock; the spike in the UV profile, which has previously been interpreted as an experimental evidence of the delta-shock, results from liquid–liquid phase separation within the chromatographic column. (2) The same system exhibits a rather peculiar behavior in breakthrough and displacement experiments, which could be well described using the generalized bi-Langmuir isotherm.

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