How to Use Boil Off Calculator

Follow these steps to start the calculation

Main Panel

  • Enter the Number of Components present in the mixture ( Minimum 2 and Maximum 10 )
  • Enter the Total number of Mols fed to the Boil Off Vessel
  • Enter the Number of Operation Steps to be simulated (Minimum 1 and Maximum 10 ).

    For example, For first hour of Boil Off, Vaccum of 500 Torr is applied and Mixture is boiled off at the rate of 50 Mols/hr, Then this first hour becomes Operation Step 1. Now For second hour Boil Off is done at atmospheric pressure of 760 Torr and boil off rate is 30 Mols/hr , Then this will become second Operation Step. In this manner Maximum 10 Operation Step can be defined in this application.

Click the Next Button Next to move to the Input Data Panel

Input Data Panel

  • Select Component from the List
    • Select Component Number from Drop down menu, eg. Comp 1.
    • Select the Chemical from the List
    • Press the Select Button
    • For the second Component select Comp 2. from Drop down menu and repeat the above mentioned steps.
  • Or Manually Enter the Chemical Properties in the Table
    • Enter the Component Name
    • In Xi Column enter the Component mole fraction
    • Enter the Antoine equation parameters A,B,C for the equation
      log10(P) = A-B/(T+C), where P is in Torr, T is in degree C.
    • If Non-Ideal liquid behaviour is to be considered then enter Liquid Molar Volume, Vi ( in cm3/gm-mol ). Enter the Wilson interaction parameters in (cal/mol).
  • Select whether Ideal Vapor & Liquid is to be considered OR Ideal Vapor & Non Ideal Liquid is to be considered.
A Snapshot for the Input Data Panel Snapshot for Input Data Panel

Click the Next Button Next to move to the Operation Steps Panel

Operation Steps Panel

  • Enter the Pressure in Torr for different Operation Steps
  • Enter the Boil Off Rate in Mols/hr for different Operation Steps
  • Enter the Time in hr for different Operation Steps
  • Keep a check on Material left in Still, it should not become less than 0
Click the Next Button Next to move to the Graphs Panel

Graphs Panel

In this section following Results are plotted with time
  • Distillate Vapor Composition with Time
  • Distillate Collected (Accumulated in Receiver) Composition with Time
  • Still Composition with Time
  • Still Temperature with Time
  • Material in Distillate and Still with Time
Click the Next Button Next to move to the Result Panel

Result Panel

In this section simulation results are compiled from differnt panels. These results can be copied and pasted in any text editor or spreadsheet program for future record.

NOTE - Press Next Button to go to next Panel, as data from Panel is read only when next button is pressed, similarly calculation is started and results are provided only when next button is pressed.

To Copy data follow these steps -

  • Press CTRL + A to Select all text matter in the text window.
  • Press CTRL + C to Copy the selected text matter.
  • Open any Text or Spreadsheet editor and press CTRL + V to Paste the selected Text.

Start | Applications | Sample 1 | Sample 2