Column Wash (Simplified)

General Description

The main objective of this operation is to estimate the time and buffer required for washing (or equilibrating/rinsing/regenerating) a column.

Unit Procedure Availability

●      Gel Filtration Procedure

●      Packed Bed Adsorption (PBA) Chromatography Procedure (Simplified)

●      Expanded Bed Adsorption (EBA) Chromatography Procedure

Column Wash (Simplified): Modeling Calculations

Buffer Volume Calculation

The buffer volume is equal to the bed volume of the column times the volume factor (in packed bed volumes) that is specified by the user.

Wash Flowrate Specifications

In terms of elution flowrate you can either specify the linear velocity, the absolute flowrate, or the relative flowrate:

ColumnFeedFlowAbs00630.jpg 

eq. (A.171)

ColumnFeedFlowRel00633.jpg 

eq. (A.172)

Process Time Calculation

The process time is calculated using the following equation:

ColumnFeedProcessTime00636.jpg 

eq. (A.174)

The feed (buffer) volume in the above equation is expressed in ‘packed bed volumes’.

Material Balances

All materials used for washing/equilibrating/regenerating a column end up in the waste stream.

Note. Since the flowrate of a wash/equilibration/regeneration stream is adjusted by the model, the user must make sure that the composition of the stream is correct and not worry about the total stream flowrate.

Column Wash (Simplified): Interface

The interface of this operation has the following tabs:

●      Oper. Cond’s, see Column Wash (Simplified): Oper. Conds Tab

●      Labor, etc, see Operations Dialog: Labor etc. Tab

●      Description, see Operations Dialog: Description Tab

●      Batch Sheet, see Operations Dialog: Batch Sheet Tab

●      Scheduling, see Operations Dialog: Scheduling Tab