A method for optimizing at least one process parameter of a
separation process for at least one target substance from at least one
impurity using a
chromatography system, comprising the steps of: a) providing a set of preliminary
system-specific parameters suitable for describing the concentration transport of at least one target substance and at least one
impurity in a preliminary
chromatography system using a system-specific transport model, wherein the preliminary
chromatography system does not include any
chromatography column but includes a column shortcut; b) providing a set of preliminary column-specific parameters suitable for describing the concentration transport of at least one target substance and at least one
impurity in only a preliminary
chromatography column containing a preliminary chromatography matrix using a column-specific transport model; c) using an
sorption model, the set of preliminary system-specific parameters, and the set of preliminary column-specific parameters to optimize at least one process parameter of the separation of at least one target substance into or from a preliminary chromatography matrix contained in a preliminary
chromatography column. A step of determining a set of
sorption-specific parameters suitable for describing the adsorption and / or
desorption of one target substance and at least one impurity, wherein the preliminary chromatography system includes the preliminary chromatography column of step b) instead of the column shortcut of step a), d) a set of system-specific parameters suitable for describing the concentration transport of at least one target substance and at least one impurity in the chromatography system using a system-specific transport model, wherein the chromatography system does not include any chromatography column but includes a column shortcut, e) a set of column-specific parameters suitable for describing the concentration transport of at least one target substance and at least one impurity in chromatography columns including a chromatography matrix using a column-specific transport model, f) the following parameters: using the set of system-specific parameters of step d), the set of column-specific parameters of step e), and the set of
sorption-specific parameters of step c),A step for optimizing at least one process parameter
in silico, wherein the chromatography system includes a step of step e) with a chromatography column instead of a column shortcut in step d), and the sum of the volume of the chromatography system without any chromatography column and the volume of the chromatography column is different from the sum of the volume of the spare chromatography system without any chromatography column and the volume of the spare chromatography column.