Category Archives: Chemical engineering computing

Learn how to model chemical engineering problems.

Introduction to Chemical Engineering

September 7, 2013 I have been updating the material on use of Aspen Plus to include version 8.0-8.2. The way you get to the various windows is somewhat different, although most of the operating windows look very similar. Thus, some … Continue reading

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July 31, 2013 Last week I attended part of the Summer Institute run by the Center for Process and Analytical Chemistry (CPAC – but not the political one!) (www.cpac.washington.edu). While I didn’t attend all the sessions (one of the privileges … Continue reading

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Chemical Reactor with Mass Transfer Limitations – in Comsol

In chemical reactors with a catalyst, sometimes the rate of reaction is governed by the concentration on/in the catalyst, which can be different from the concentration in the bulk fluid. This happens when the rate of mass transfer is not … Continue reading

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System Mass Balances in Excel

I’ve added some more material to the web site – solving mass balances for processes with recycle streams, using Comsol. In process simulators, one usually solves the equations by taking the input to a unit, solving that unit, taking the … Continue reading

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How to solve CSTRs in Comsol

I’ve added some material to the web site – solving equations for Continuous Stirred Tank Reactors (CSTR) using Comsol. There are some things you have to be careful of when the parameters lead to multiple solutions or to no steady … Continue reading

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For Beginners with Comsol and with Excel

If you are a new user of Comsol Multiphysics, there is a nifty way to work through the first example in the book. A pdf version of the first example in Chapter 9 (heat conduction) is available at http://www.ChemEComp.com. You … Continue reading

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New Resources Added to Website

I’ve added new resources to the website, chemecomp.com. There you will find Problem 9.26 worked. This is a problem to examine the proposition that if one has a transport problem with a large velocity (Peclet number) it is easier if … Continue reading

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