Batch Vaporization / Solvent Switch: 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

○ Solvent Switch Stream Indicates the input port that is connected to the stream which is used to transfer in 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
○ 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 Duty (kcal/h) The heat transfer rate of the heating agent.	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)
○ 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
◙ Evaporation Time (min) The actual duration of the operation.	60.0	Positive
◙ Evaporation Rate (L/h) The ratio of evaporation volume (i.e., volume of evaporated solvent at final temperature and operating pressure) to evaporation time.	120.0	Positive
○ Gaseous 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
○ Gas Sweep Rate (L/h) The volumetric flow rate of sweeping gas (ambient air) at ambient temperature and pressure conditions.	0.0	Positive
○ Condenser On Check this box to include a vent condenser.	Yes	Yes/No
○ Condenser Temperature (^oC) The operating temperature of the condenser.	15.0	Positive
○ Condensed 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
○ 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 (Per Volume) (kW/m³) The power consumed for the operation per volume of material.	0.0	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
○ Power Dissipation to Heat (%) The percentage of total power consumed for this operation that turns into heat, thereby raising the temperature of the material contained in the equipment.	100.0	[0,100]

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 Batch Vaporization / Solvent Switch: Modeling Calculations.

•Operating Mode...

By default, concentration takes place during evaporation. Use the solvent switch mode in order to add new solvent that will replace any lost liquid volume during evaporation.

•Duration options...

You can set the process time (evaporation time), or have the process time calculated based on evaporation rate.

•Vent Condenser...

If the vent condenser is on, the condensed vapor can be removed through a different port/stream and handled appropriately. In that case only the uncondensed components remain in the gaseous stream. If the condenser is not on, then, all vaporized components will be in the gaseous stream.

•Pressure...

The pressure of the system, if not specified by the user, is set equal to the pressure of the previous operation.

•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.