Dear everyone.

I am biulding a TSA simulation in Aspen Adsorption. I do not have a single component feed stream, but a multi-component one. I am using the Gas_Dynamic "gas_bed" block. In the "Isotherm" tab of the configuration option of the "gas_bed" block I have to choose the hopeful more suitable isotherm type for my case study. In the Aspen Adsorption Help is written that there are isotherm models eighet for pure components or for multi-component mixture. It is also written that several methods for predicting mixture isotherms from pure component data are available. Specifically, Aspen Adsorption provides the following methods for multi-component mixture:

-Vacancy Solution

-Extended Langmuir Approach

-Dual-Site Langmuir

-Ideal Adsorbed Solution (I.A.S.T) Theory

-Real Adsorbed Solution Theory

The I.A.S.T is available for the following isotherm types:

-BET

-Freundlich 1 and 2

-Henry 1 and 2

-Langmuir 1, 2 and 3

-Langmuir-Freundlich

A lot of isotherm reported in literature provide Toth isotherm instead.

The thing that I do not understand (and for which I ask your opinion) is what could happen if I selected Toth isotherm for a multi-component mixture. In fact, Aspen Adsorption does not gray out the isotherm models for pure components. I am able to choose Toth isotherm and in the Specify Table it is possible to fill the isotherm data for every component of my mixture. What could happen if chose the Toth isotherm in the case of a multi-component mixture? I mean even by entering every isotherm parameters for every component in the mixture.

I hope that I have explained myself well.

Thank you for your answers.

Best regards.