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Distillation - Deprop

Distillation Tutorial

 

Distillation Simulation

 

 

Envision Systems Distillation TutorialCopyright © 2009 by EnVision Systems Inc. All rights reserved worldwide.

Distillation Tutorial

The interactive Distillation tutorial provides an overview, fundamental principles, process control principles and operating principles for a multi-component distillation column, using a depropanzier as an example and using voice, video, animation and graphics. The topics covered are:

Overview

  • About Distillation
  • Tower
  • Trays
  • Reboiler/Condenser    
  • Reflux Drum

Basic Principles   

  • Ideal Gas Law
  • Vapor Pressure    
  • Boiling Point
  • Dalton's and Raoult's Law
  • Separation Principle    
  • Composition vs. Temperature

Distillation Control

  • Introduction    
  • Feed and Product Control
  • Composition Control
  • Reflux Control
  • Pressure Control    
  • Others    

Startup Operation

  • Prepare Startup    
  • Start Heating
  • Start Reflux Flow
  • Total Reflux    
  • Extract Products

Normal Operation

  • Introduction    
  • Load Changes
  • Change in Product Compositions
  • Feed Composition Changes    

Shutdown Operation

  • Begin Shutdown
  • Stop Extracting Products
  • Remove Bottom Liquid

Troubleshooting

  • Introduction    
  • Reflux Pump Trip
  • Reflux Drum Level Transmitter Failure
  • Loss of Feed
  • Loss of Condenser Coolant
Envision Systems Distillation SimulationCopyright © 2009 by EnVision Systems Inc. All rights reserved worldwide.

Distillation Simulation

The Distillation simulation is a rigorous and high-fidelity mathematical process model that provides a realistic dynamic response for a depropanzier distillation column.

Process Overview:

A depropanizer unit separates a mixture, consisting primarily of C3 and C4 hydrocarbons, into two product streams. The lighter product, from the top of the unit, consists primarily of C3s; and the heavier product, from the bottom of the unit, consists of C4s and heavier hydrocarbons. The feed mixture to the unit is typically from either the deethanizer unit bottoms or the debutanizer unit overheads.

The depropanizer unit recovers the C3s from the feed mixture. The bottom product is further processed in the downstream units to recover other heavy hydrocarbons.

Major Operations for Trainee Practice:

  • Startup and Shutdown Operations
  • Normal Operations
  • Emergency Shutdown Operations
  • Troubleshooting Equipment, Instrument and Control Valve Malfunctions
  • Malfunction Recovery Actions

 

Simulation Features:

  • Detailed Tray-by-Tray Calculations
  • Condenser Flood Back Simulation
  • Plant Alert and Monitor for
    • Flooding of Trays
    • Opening of Safety Valves
  • Equipment Details
  • Dynamic Tray Animation with Detailed Information
  • Dynamic Bar Charts for Tower Temperature, Flows, Pressure Drop Profiles
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