Distillation Column Design

Other Important Topics in
Column Design

Outline
 Sub-Flowsheets
 Thermodynamic model (Fluid Package)

selection
 Solver selection

Sub-flowsheets
 HYSYS has a multi-flowsheet architecture.
 A big flowsheet can be split up into smaller

sub-flowsheets.
 Each sub-flowsheet has its own streams, operations, PFD and an independent fluid package.  The column in HYSYS is a sub-flowsheet where independent operations are possible

H83 PS1/H84 CFL

Templates
 A template is a special type of HYSYS case

that can be inserted as a sub-flowsheet into other HYSYS design cases
 To create a template
 Convert a whole flowsheet into a template
 Create a new template
 Convert part of a flowsheet into a template

H83 PS1/H84 CFL

Convert a whole flowsheet
 Access the main properties (simulation-main

properties) and select ‘convert to template’ button.  Set the ‘template tag’, ‘transfer basis’ and other information if necessary.
 Template tags are short names to identify the sub-flowsheets

associated with a stream
 Sub-flowsheets can use a different fluid package

 When you save simulation, it will e saved as a template

H83 PS1/H84 CFL

Create a new flowsheet
 From ‘file’ menu, select ‘new’ then ‘template’
 Build a regular flowsheet
 Access the main properties (simulation-main

properties) and set ‘convert to template’ button the ‘template tag’, ‘transfer basis’ and other information if necessary.
 When you save simulation, it will be saved as a template

H83 PS1/H84 CFL

Covert part of a flowsheet
 On PFD, select all the unit ops and streams

you want to capture
 Right click and select ‘cut/paste objects’ andb then ‘copy objects to file (export)’ and save the objects.  From ‘file’ menu, select ‘open’ and then
‘cut/copy/paste and navigate to the file we just saved
 Convert the new case thus created to a template as explained earlier

H83 PS1/H84 CFL

Installing a template