ChemCAD (Presentation)1

7/27/2019 ChemCAD (Presentation)1

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CHEMCADPRESENTATION

Anderson Bayless Carr Cobb


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What is ChemCAD?

Chemical process simulation program

Applications Distillations & Extractions

Reaction Simulations

Electrolytic Processes

Thermo-physical Property

Calculations

Vapor/Liquid EquilibriumCalculations

Benefits and

Limitations

Equipment Sizing Heat Exchanged Networks

Environmental Calculations

Safety Analyses

Cost Estimation

Flare Header Systems

Utility Networks


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Accessing ChemCAD

Where to find ChemCAD forFREE

DELL computers in Rodgers library

CD from ChE Office in Houser Hall

How to log into ChemCAD at Rodgers

Sign in using MyBAMA username and password

Click on the ChemCAD icon


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Finding Solubility Data

Step 1:

Thermophysical;

Component

Database; View/EditDatabase

Component


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Step 2: Search for a component (sodium

chloride/adipic acid)


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Step 3: Click on the

Basic Data button


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Step 4: Read solubility data from chart


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Finding Specific Gravity Data

Step 1:

Thermophysical;

Component

Database; View/EditDatabase

Component


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Step 2: Search for a component (bezene, coal,

and sulfur dioxide)


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Step 3: Click on the

Density Data button


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Step 4: Read density data from chart, multiply

my molecular weight from basic data tab, and

divide by density of water at same temperature


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Ethanol/Water Distillation

Step 1: Select Engineering Units under

Format

Step 2: Select Common SI and change

pressure to atm and hit OK


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Step 3: Select Select Components under

Thermophysical


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Step 4: Select Water and Ethanol and move

them to the right column. Then, hit OK. Two

more windows pop up. Hit OK for both.


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Step 5: Select the feed

stream (Red) and place it

in the work window. Do

the same for the twoproduct streams (Green)

and the column (Black).


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Step 6: Select the stream

line and connect the feed

and product arrows to the

distillation column.


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Step 7: Double click the feed stream arrow

and adjust parameters.


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Step 8: Double click on the column and

change the parameters under General and

Specifications. Hit OK.


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Step 9: Click the green triangle to run the

distillation simulation.


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Vapor/Liquid Equilibrium Data

Step 1: Reference slides on ethanol/water

distillation to design column

Step 2: Select TPXY under Plot and choose

appropriate parameters


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Sample XY Diagram for ethanol and water


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Sample TXY Data for ethanol and water


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Sample Problem

Design a 10-tray distillation column where a

mixture of ethanol and water is feed stream.

Ethanol is 15 weight% of feed stream. Use 1

atm for pressure. There is a partial reboilerand total condenser (reflux ratio is 1.2). The

bottoms composition of ethanol is 0.05. The

feed tray is tray 4. Find the distillate weight

percent of ethanol.


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Homework Problem

Due Tuesday, Oct 1st

Please submit one hard copy per team on Tuesday, Oct.1st in class.

Design an ethanol/water distillation column with yourown parameters (inlet stream composition, inlet streammass flow rate, temperature, pressure, number of trays,feed tray, bottom stream composition).Modify the reflux ratio, with all other parametersbeing constant, and write a brief paragraph on howthe distillate composition of ethanol changes whenyou modify the reflux. Include the parameters you

used, the reflux ratio values you tested, and thecorresponding distillate concentrations in youranalysis. Explain your findings based on yourknowledge of distillation columns.

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