Retentate Wash: Retentate Wash Tab

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

●      Retentate Wash

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

 

○ Wash In Stream
Indicates the input port that is connected to the wash-in stream. 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

◙ Volume per Cycle, per Unit (L)
The volume of the wash-in stream per cycle and per unit.

0.0

Positive

◙ Volume per Retentate Volume (vol/vol of Retentate)
The volume of the wash-in stream per retentate volume.

1.0

Positive

○ Wash Out Stream
Indicates the output port that is connected to the wash-out stream. Click on the list box to bring up a list of available output ports in order to select one.

<none>

Any Output Port

◙ Set by User Cake Liquid (%) Displaced by Wash Agent
The percentage of the liquid portion of the cake that is displaced by the ash agent.

0.0

0-100

◙ Approach to Theoretical Displacement (%)
Factor that determines the degree that the actual displacement of solvent and soluble components in the retentate with the wash solvent approaches the theoretical displacement for the Displacement Wash Type option.

90.0

0-100

○ Setup Time
The amount of time (per cycle) spent before each operation is carried in preparation for the actual execution of the operation. It may involve actions like cleaning, vacuuming, setting up of equipment, etc. which the user opted not to model explicitly.

0.0

Positive

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

30.0

Positive

○ Wash Flux (L/m2-h)
The volumetric flow rate of the wash stream per filter area. Note that this value is always set in Design Mode.

250.0

Positive

○ Power Type
Indicates the power type that is used by the operation. Click on the list box to bring up a list of available power types in order to select one.

<Std Power>

Any Power Type

◙ Specific Power (kW/m3)
The power consumed for the operation per filter area.

0.1

Positive

◙ Total Power (kW)
The total power consumed for the operation (per cycle).

0.0

Positive

◙ Power Per Unit (kW)
The power consumed for the operation per equipment unit.

0.0

Positive

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 Cake Wash: Modeling Calculations.

•Wash Time Options...

In Rating Mode (specified equipment size), the user has the option of setting either the Wash Time or the Average Filtrate Flux.

•Wash In/Out Streams...

For multiple washes of a retentate the user has the option to select different wash streams of different (optional) compositions. The availability of multiple wash out streams enables the user to segregate the mother liquid and the wash solutions.

•Amount...

The amount of the wash liquid can be specified on an absolute basis (in L) or relative to the volume of the retentate.

•Set by User Cake Liquid Percentage Replaced by Wash Agent...

The percentage of the liquid retained in the cake that will be displaced by the wash agent.

•Wash Type...

Displacement is equivalent to embolic wash. The wash liquid displaces in an embolic (plug flow) way the liquid in the interstitial space of the retentate. In Slurry wash type, it is assumed that the wash liquid is mixed with the retentate and the slurry is refiltered.