GAC Column Wash: Oper. Conds Tab

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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

 

◙ Relative Flowrate (BV/min)
The volumetric flowrate of the wash solution in the bed, expressed in number of bed volumes per time unit.

0.15

Positive

◙ Absolute Flowrate (L/h)
The volumetric flowrate of the wash solution in the bed.

36000.0

Positive

◙ Approach Velocity (cm/h)
The approach velocity of the wash solution in the bed.

1500.0

Positive

◙ Relative Volume (BV)
The volume of the wash solution per cycle and per equipment unit, expressed as number of bed volumes.

2.0

Positive

◙ Absolute Volume (L)
The volume of the wash solution per cycle and per equipment unit.

10000.0

Positive

◙ Washing Time (min)
The actual duration of the operation (per cycle).

20.0

Positive

○ Wash Inlet Stream
Indicates the input port that is connected to the wash inlet stream. Click on the list box to bring up a list of available input streams in order to select one. If an input stream is already present at the selected port, then the button next to the selection is active. Click on the 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

○ Wash Outlet Stream
Indicates the output port that is connected to the wash outlet stream. Click on the list box to bring up a list of available output streams in order to select one.

<None>

Any Input 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 GAC Column Wash: Modeling Calculations.

•If the Washing Time is Set by User...

You can either set the Flowrate (Relative / Absolute / Approach Velocity) or set the Volume (Relative / Absolute).

•If the Washing Time is Calculated...

In this case, both the volume and the flowrate need to be set.

•Wash Inlet and Outlet Ports/Streams...

To specify the composition of the wash 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 model during simulation will adjust the flowrate of that stream. The multiple outlet streams offer you to flexibility to segregate the various solutions used during washing, regeneration, etc.