Batch Vaporization / Solvent Switch: Mat. Balance Tab (Concentration Mode)

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

○ Scalable Check this box to scale evaporation data.	Yes	Yes/No
◙ Final Liquid Volume (L) The volume of the solution at the end of this operation (per batch cycle and per equipment unit).	0.0	Positive
◙ Evaporation Volume (L) The volume of evaporated solvent at final temperature and operating pressure (per batch cycle and per equipment unit).	0.0	Positive
◙ Concentration factor The ratio of initial to final volume of solution.	1.0	Positive
○ Key Component Indicates the reference component used to set or calculate a final concentration and mass fraction. 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.
○ Final Concentration Of Key Component (g/L) Concentration of key component in the final concentrated solution.	0.0	Positive
○ Include Check the box next to a component to indicate that the corresponding component is volatile.	No	Yes/No
◙ Relative Mass Evaporation The ratio of evaporation percentage to maximum evaporation percentage for each component.	1.0	Zero or Positive
◙ Evaporation Percentage (%) The percent ratio of evaporated mass to initial mass for each component.	0.0	[0,100]
○ Average Heat of Vaporization (kcal/kg) The average specific heat of vaporization of the feed solution.	539.603	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 Batch Vaporization / Solvent Switch: Modeling Calculations.

•Component Evaporation Option...

If you select one of the top options (under “Set Relative Mass Evaporation for Each Volatile Component”), in the Evaporation Data table you are supposed to identify the volatile components and specify their relative mass evaporation. For instance if 3 kg of Acetone evaporate for every kg of Water, you should enter 3.0 for Acetone Relative Mass Evaporation and 1.0 for Water. This is necessary because this operation does not perform VLE calculations.
If you select the bottom option (“Set Evaporation % for Each Volatile Component”), in the Evaporation Data table you are supposed to identify the volatile components and specify their evaporation %.