Rotary Vacuum Filtration: Oper. Conds Tab

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

○ % Removed The percentage of a particulate component that is removed.	0.0	0-100
◙ LOD (%) The amount of volatile components in a cake sample measured using a Loss On Drying (LOD) test.	40.0	0 – 100
◙ Cake Porosity The fraction of void spaces in the cake over the total volume of the cake.	0.4	0 – 1
◙ Solvent Retained The percentage of solvent that is retained by the cake.	20	0 – 100
◙ Filtration Time (min) The actual duration of the operation (per cycle).	60.0	Positive
◙ Average Filtrate Flux (L/m²-h) The average value of the filtrate flux after loading.	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
○ Cake Wash Stream/Port Indicates the input port that is connected to the cake wash 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 cake wash stream.	<None>	Wash In Port
◙ Volume Per Cake Volume The volume of the cake wash stream per cake volume.	3.0	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 Rotary Vacuum Filtration: Modeling Calculations.

•Cake Dryness...

It is specified either in terms of Loss-On-Drying (LOD) or as Cake Porosity.

•Filtration Time Options ...

If the process operating mode is batch and the equipment is in design mode, the user must set both the Filtration Time and the Average Filtrate Flux. If the process operating mode is batch and the equipment is in rating mode (specified equipment size), the user has the option of setting either the Filtration Time or the Average Filtrate Flux. If the process operating mode is continuous, the Average Filtrate Flux is set in design mode and calculated in rating mode.

•Amount...

You can either specify the volumetric flowrate of the cake wash stream (through the dialog of that stream) or you can specify the relative volume of that stream with respect to the volume of the cake.