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___ University of Washington Department of Chemical Engineering

ASPEN PLUS 12.1 Instructional Tutorials

Developed in the Fall Quarter of 2004 in Chem E 435 (Mass Transfer and Separation)

Matthew Bernards René Overney

This Tutorial was developed with the Windows Version of ASPEN PLUS 12.1. Our Site License allows us to install a software version on the personal computer of theinstructor and TA. The Tutorial was developed with the idea in mind that it is used and extended in other courses of the ChemE Curriculum. As it currently stands, the tutorial is applicable for students in: ChemE 310 (Unit Operations): Tutorial Units 1-3, ChemE 326 (Thermodynamics): Tutorial Units 4 and 5, ChemE 435 (Mass Transfer and Separations): Tutorial Units 3-6. Additional unit developments aresuggested for: • • • • • • Chemical Reactions (ChemE 465) Chemical Reactor Design (ChemE 465) Heat Streams (ChemE 340 / ChemE 435) Heat Exchanger Design (ChemE 340) Pressure Drop Calculations (pipe, pumps, valves, etc.) (ChemE 330) Using Fortran Statements (ChemE 465)

The ASPEN 10.1 Tutorial developed in ChemE 310 by Martin and Babb would provide some background information on Fortran Statements,Chemical Reactions and Heat Streams and Heat Exchanger Design. A fast printable PDF version of this Tutorial and a MS-Word version for further unit developments and improvements can be downloaded at http://courses.washington.edu/overney/ChemE435.html.

Table of Contents:
Tutorial #1: Aspen Basics Tutorial #2: Convergence and Presentation of Results with Homework and Solution Tutorial #3: FlashSeparation with Homework and Solution Tutorial #4: Thermodynamic Methods with Homework and Solution Tutorial #5: Sensitivity Analysis and Transport Properties with Homework and Solution Tutorial #6: Distillation with Homework and Solution Final Homework and Solution 1 2 11 19 21 30 32 37 39 51 52 65 69

Aspen Tutorial #1: Aspen Basics
Outline: • • • • • • • Introduction to Aspen ProblemDescription Beginning a Simulation Navigating the Aspen Window Creating a Process Flowsheet Data Input Running the Simulation

Introduction: In industry complicated problems are often not solved by hand for two reasons: human error and time constraints. There are many different simulation programs used in industry depending on the field, application, and desired simulation products (entire processunit, one piece of equipment, etc.). When used to its full capabilities, Aspen can be a very powerful tool for a Chemical Engineer in a variety of fields including oil and gas production, refining, chemical processing, environmental studies, and power generation to name a few. Over the course of these tutorials, you will be introduced to some of the basic features of Aspen as we build a simulation ofan acetone/water extraction-distillation process. This problem is based very loosely on Example Problem 4.4-2 in Elementary Principles of Chemical Process by Felder and Rousseau. Because we will build on our existing simulation with each tutorial, it is highly recommended that you save your work every week so you do not have to start from scratch each time. The homework problems will emphasizeone particular feature of Aspen that is covered in the tutorial for that week. Problem Description: A mixture containing 50.0 wt% acetone and 50.0 wt% water is to be separated into two streams – one enriched in acetone and the other in water. The separation process consists of extraction of the acetone from the water into methyl isobutyl ketone (MIBK), which dissolves acetone but is nearlyimmiscible with water. The overall goal of this problem is to separate the feed stream into two streams which have greater than 90% purity of water and acetone respectively. This week we will begin by learning the basics of running Aspen and building a process flowsheet. This will be one of the longest tutorials of the quarter as it introduces you to a number of features that must be understood to...