Column Wash: Oper. Conds Tab

This tab appears on the interface dialog of the following operation:

Variable Definitions, Ranges and Default Values

The following table shows a brief description of the variables appearing in this tab. The table also displays their default values and their generally acceptable range:

Variable	Default Value	Range

◙ Linear Velocity (m/h) The linear velocity of the regeneration buffer in the membrane.	0.0	Positive
◙ Absolute Flowrate (m³/h) The volumetric flowrate of the regeneration buffer in the membrane.	0.0	Positive
◙ Relative Flowrate (MV/h) The volumetric flowrate of the regeneration buffer in the membrane expressed as number of membrane volumes per time unit.	30.0	Positive
◙ Relative Volume (per Cycle, per Unit) (MV) The volume of the regeneration buffer per cycle and per equipment unit expressed as number of membrane volumes.	30.0	Positive
◙ Absolute Volume (per Cycle, per Unit) (L) The volume of the regeneration buffer per cycle and per equipment unit.	0.0	Positive
◙ Process Time (min) The actual duration of the operation (per cycle).	30.0	Positive
● Retained Amt Before (kg) The retained mass in the membrane for each component at the start of this operation.	0.0	Positive
○ Release % The percentage of retained mass in the membrane for each component that ends up in the wash outlet stream.	0.0	0 – 100
● Retained Amt After (kg) The retained mass in the membrane for each component at the end of this operation.	0.0	Positive
○ Inlet Stream (of Buffer) Indicates the input port that is connected to the buffer’s inlet stream. If an input stream is already present at the selected port, then the button next to the selection is active. Click on that button to bring up the attached stream’s simulation dialog in order to provide the composition of the material being charged.	<None>	Any Input Port
○ Outlet Stream (of Buffer) Indicates the output port that is connected to the buffer’s outlet stream. Click on the list box to bring up a list of available output ports in order to select one.	<none>	Any Output Port

Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output

Specification Choices / Comments

The following list describes the available specification choices in this tab; for more details on how these are implemented, see Column Wash: Modeling Calculations.

•Process Time Options...

You may choose whether process time is set or calculated. If the process time is set you have the option to specify either the buffer’s Volume (per cycle, per unit) or its Flowrate. If the process time is calculated then you must set both the Flowrate and the Volume.

•Buffer Volume Options...

If the process time and buffer volume are set by user, or if the process time is calculated, you can specify the buffer volume. Either the absolute volume (per batch cycle and per equipment unit) or the relative volume (in bed volumes) can be set. Any variable that is not specified will be calculated by the program.

•Buffer Flowrate Options...

If the process time and buffer flowrate are set by user, or if the process time is calculated, you can specify the buffer flowrate. You can choose among three different options for specifying the buffer flowrate: you can specify the buffer’s linear velocity in the bed, or its volumetric flowrate in the bed, or its relative flowrate (in bed volumes). Any variable that is not specified will be calculated by the program.

•Inlet Stream Composition ...

To specify the composition of the buffer’s inlet stream, click on the Edit Composition button. That brings up the dialog of that stream and allows you to specify its composition. Please note that the flowrate of that stream will be adjusted by the program during simulation.