Rigorous Distillation Column: Equipment tab

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Variable Definitions, Ranges and Default Values

The following table shows the meaning of the variables appearing in this tab, as well as their default values and their generally acceptable range. Note that due to the manner by which the variables are used by the sizing and costing equations, the range of acceptable values may be further reduced.

Variable

Default Value

Range

 

Actual Stages
The number of actual stages.

0

Positive

Max Diameter
The maximum diameter that a unit of this type is available for purchase of the market.

2.0 m

Positive

Stage Height
The height of each stage.

0.4 m

Positive

Column Height
The height of the distillation column.

0.0 m

Positive

Column Diameter
The diameter of the column.

0.0 m

Positive

Volume
The total volume of the column.

0.0 L

Positive

Design Pressure
The maximum pressure that the vessel has been designed to withstand.

1.52 bar

Positive

Is ASME Vessel?
ASME standards of vessel construction will increase the cost of the vessel.

Yes

Yes/No

Symbol Key: User-specified value (always input); Calculated value (always output); Sometimes input, sometimes output

Sizing: Design Mode

In Calculate (Design Mode), the user specifies the Maximum Diameter and Stage Height and the system computes the Number of Units, Number of Actual Stages, Column Height, and Column Diameter. For more information on sizing of the rigorous distillation column, see Continuous Distillation (Rigorous): Modeling Calculations.

Sizing: Rating Mode

In User-Defined (Rating Mode), the user specifies the Number of Units, Number of Actual Stages, Column Height, and Column Diameter.

Costing

The equipment purchase cost is based on the diameter and the height of the column. It is supplied by the built-in model assuming as material of construction CS. Other factors that affect the cost are:

Conforming to ASME Specification; if checked, then the vessel is assumed to have been constructed according to standards published by the American Society of Mechanical Engineers (ASME) and it is assumed to withstand pressure up to 35psig. Checking this option penalizes the cost by about 20% over the base cost.

For more information on this equipment, see Rigorous Distillation Column.

For information on the left-hand side variables and options, see Equipment Data Dialog: Equipment tab.