Rigorous Batch Vaporization: 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

● Final Temperature (^oC) The final temperature of vessel contents at the end of the operation.	70.0	Positive
○ Pressure (atm) The operating pressure of the vessel.	1.0	Positive
○ Vacuum Pump Indicates the name of the engaged vacuum pump (a type of auxiliary equipment). Click on the list box to bring up a list of available vacuum pumps in order to select one.	<none>	Any Vacuum Pump
○ Vacuum Pump Power (kW) The power consumption of the engaged vacuum pump.	0.0	Positive
○ Heating Agent Name Indicates the heating agent used for the operation. Click on the list box to bring up a list of available heating agents in order to select one.	<Steam>	Any Heating Agent
● Inlet Temp. (^oC) The inlet temperature of the heating agent.	152.0	Positive
● Outlet Temp. (^oC) The outlet temperature of the heating agent.	152.0	Positive
● Rate (kg/h) The mass flow rate of the heating agent.	0.0	Positive
○ Heat Transfer Efficiency(%) The heat transfer agent efficiency. If the value is lower than 100% then an increased heat transfer agent amount will be calculated by the program to satisfy the required duty.	100.0	[0,100)
○ Vent Stream Indicates the output port that is connected to the stream which is used to transfer out the gaseous phase. Click on the list box to bring up a list of available output ports in order to select one.	<none>	Any Output Port
○ Condenser On Check this box to include a vent condenser.	Yes	Yes/No
○ Condenser Liquid Stream Indicates the output port that is connected to the stream which is used to transfer out the condensed liquid phase. Click on the list box to bring up a list of available output ports in order to select one.	<none>	Any Output Port
○ Condenser Temperature (^oC) The operating temperature of the condenser.	15.0	Positive
◙ Cooling Duty (kcal/h) The heat transfer rate of the cooling agent, if a cooling agent is used.	0.0	Positive
○ Setup Time (min) 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.	5.0	Positive
◙ Process Time (min) The actual duration of the operation.	60.0	Positive
◙ Heat Rate (kcal/h) The constant heating rate applied to the vessel contents in order to raise the temperature to the bubble point of the mixture and subsequently, vaporize the liquid contents.	0.0	Positive
● Avg. Vaporization Rate The average vaporization rate of the operation.	0.0	Positive
○ Solvent Switch Stream Indicates the input port that is connected to the stream which is used to transfer in the new solvent that replaces the existing one. Click on the list box to bring up a list of available output ports in order to select one.	<none>	Any Input Port
◙ Molar Percentage (%) The target molar percentage of the liquid contents (at the end of the vaporization) w.r.t the initial liquid contents.	50.0	(0,100)
◙ Volumetric Percentage (%) The target volumetric percentage of the liquid contents (at the end of the vaporization) w.r.t the initial liquid contents.	50.0	(0,100)
○ Scalable Check this box to scale operation data.	Yes	Yes/No
◙ Liquid volume (L) the target volume of the liquid contents at the end of the vaporization.	1000.0	Positive
○ Key Component Indicates the reference component for the vaporization target (i.e., molar percentage in the final liquid contents or mass concentration). Click on the list box to bring up a list of registered components in order to select a valid component of the feed stream.	<None>	Any Comp.
◙ Component Molar Percentage (%) The target molar percentage of the key component in the final liquid contents.	50.0	(0,100)
◙ Component Concentration (g/L) The target mass concentration of the key component in the final liquid contents.	0.0	Positive
○ Solvent Amount (L) The volume of the Solvent Switch stream per batch cycle and 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 Rigorous Batch Vaporization: Modeling Calculations.

•Operating Mode...

By default, concentration takes place during evaporation. In the solvent switch mode, a suitable amount of replacement solvent is added in the vessel at every time step in order to maintain the liquid volume at a constant value.

•Duration options...

The user can either specify the process time (vaporization time), or have the process time calculated based on a constant heating rate.

•Vent Condenser...

If the vent condenser is on, the vaporized material is condensed at the temperature of the condenser. The liquid phase is removed through a different port/stream specified by the Liquid Stream combo box.

•Vacuum Pump Controls...

Note that the vacuum pump controls are only displayed if the operating pressure is less than the ambient pressure (specified through the flowsheet’s Reference Conditions dialog).

Click on the vacuum pump list box to bring up a list of available vacuum pumps in order to select one, or select “(none)” (default) if equipment sizing, costing and scheduling calculations are not important.

To create a new vacuum pump and add it to the list of available vacuum pumps, click on the New button (). This will open the Auxiliary Equipment Properties dialog for auxiliary equipment of the vacuum pump type (see Auxiliary Equipment Properties Dialog: Aux. Equipment tab (Vacuum Pump)). Through this dialog, you can view or edit the properties of the auxiliary equipment resource (e.g., name, size, purchase cost, consumables, scheduling).

The same dialog is displayed if you select one of the available vacuum pumps from the list and click on the View/Edit Properties button ().

Click on the Setup button to display the Vacuum Pump Consumption dialog (see Vacuum Pump Power Consumption Dialog), and select different options for specifying the power consumption of the vacuum pump. By default, the vacuum pump power specification option is “Set Total Power” and the total power consumption of the vacuum pump can be set by the user (the default value is zero). For more information, see Vacuum Pump Auxiliary Equipment Calculations.