Continuous Crystallization: Crystal. Data 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

○ Solute? Check this box to specify a component as solute. Only solute components can be designated as crystallizable	No	Yes/No
○ Crystal? Check this box to specify a component as crystallizable and set its Crystal Form.	No	Yes/No
○ Design Component Name Indicates the component for which a the crystallization yield in the Oper. Cond’s tab refers to. Click on the list box to bring up a list of available components in order to select one.	<none>
○ Design Component Crystal Form The crystal form of the crystallization design component.	<none>
○ Design Component Crystallization Heat (kcal/kg) The heat of crystallization of the design component. The crystallization heat should be negative if the crystallization is exothermic and positive if it is endothermic.	0.0
○ Design Component co-crystallization agent The component that represents the co-crystallization agent for the design component crystallization.	<none>
○ Design Component agent to crystal ratio (g Agent/ g Crystal or mol Agent/ mol Crystal) The agent to crystal ratio for the design component crystallization.	0.0
○ Secondary Crystallization Component Name Indicates a secondary crystallization component. Similar to the crystallization design component, a crystal form, crystallization enthalpy, co-crystallization agent and agent to crystal ratio need to be defined.	<none>
○ Secondary Crystallization Crystal Form The component representing the crystal form of the secondary crystallization component in that row.	<none>
○ Secondary Crystallization Heat (kcal/kg) The heat of crystallization of the secondary crystallization component.	0.0	Positive
○ Secondary Crystallization Co-crystallization agent The component that represents the co-crystallization agent of the secondary crystallization component.	<none>
○ Secondary Crystallization agent to crystal ratio (g Agent/ g Crystal or mol Agent/ mol Crystal) The agent to crystal ratio for the secondary crystallization component component.	0.0
○ A Crystallization constant for the calculation of secondary crystallization component yield.	0.0
○ B Crystallization constant for the calculation of secondary crystallization component yield.	0.0
○ C Crystallization constant for the calculation of secondary crystallization component yield.	0.0
● Secondary Crystallization Component Yield The crystallization yield of the secondary crystallization component.	0.0
○ Cooling Agent Name Indicates the cooling agent used for the operation. Click on the list box to bring up a list of available cooling agents in order to select one.	<Chilled Water>	Any Cooling Agent
● Inlet Temp. (^oC) The inlet temperature of the cooling agent.	5.0	Positive
● Outlet Temp. (^oC) The outlet temperature of the cooling agent.	10.0	Positive
● Rate (kcal/h) The heat transfer rate of the cooling agent.	0.0	Positive
○ Heat Transfer Efficiency(%) The heating agent consumption efficiency. Specify a value below 100% to account for heat losses to the surroundings when a heating agent is used.	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 Continuous Cooling Crystallization: Modeling Calculations.

•Agent to Crystal Ratio...

If the agent to crystal ratio is not zero, the corresponding amount of agent is considered to be entrapped in the crystal form, thereby altering the mass balances.

•Crystallization Constants...

The constants A, B and C are used to calculate the crystallization yield of a component (usually an impurity) relative to the yield of the product component.