analysis assignment two tasks: prepare a partial mass balance run lab experiments and calculate...
DESCRIPTION
Analysis Assignment Don Robinson Mass Balance Streams Feed to Syngas process Output from Syngas process Added CO 2 Feed to methanol process Intermediate step: 100% CO=>CO 2 Output from methanol process (100% conversion, not equilibrium)TRANSCRIPT
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Analysis Assignment
Two Tasks: Prepare a partial mass balance Run lab experiments and calculate kinetic coefficients
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Analysis Assignment Don Robinson
Required Files Information about the assignment
is in “Analysis & Planning” Background information is in
“Basic Data” See “Laboratory Facilities” for
instructions on how to run the lab reactor simulator program
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Analysis Assignment Don Robinson
Mass Balance Streams Feed to Syngas process Output from Syngas process Added CO2 Feed to methanol process Intermediate step: 100% CO=>CO2 Output from methanol process
(100% conversion, not equilibrium)
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Analysis Assignment Don Robinson
Components Methane Water Hydrogen CO CO2 Nitrogen Methanol
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Analysis Assignment Don Robinson
Components cont. Also include total stream Units: kg-moles/hr
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Analysis Assignment Don Robinson
Catalyst Analysis Objective Arrhenius constants (A & E) methanol + CO2 + 3H2 => ethanol + 2H2O ethanol + 5CO2 + 15H2 => fusel oil +
10H2O 2ethanol => acetone + methanol + H2 E in kJ/kg-mol A’s (same as kf,kr) some combination of
kg-mol, hours, m3
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Analysis Assignment Don Robinson
Simulated Runs Reactor size (1X2 or 2X12.5 cm) Temperature (200 & 225°C) Pressure (fixed at 3900 kPa) Feed rate (.5 to 20 kg/hr) Methanol & Ethanol rates (50-2000
gms/hr)
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Analysis Assignment Don Robinson
Data InputRun Specifications
Reactor Size 0
Temperature 200 CFeed Rate 1 kg/hrMethanol Rate 0 gms/hrEthanol Rate 0 gms/hr
Small
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Analysis Assignment Don Robinson
Summary of ConditionsResults
Run Number 1 2Reactor Diameter cm 1 1Reactor Length cm 2 2Temperature C 200 200Feed Rate kg/hr 1 1Methanol Rate gms/hr 0 100Ethanol Rate gms/hr 0 0
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Analysis Assignment Don Robinson
FeedMass Fraction Base Feed FeedMethane 0.18 0.18 0.163636Water 0.05 0.05 0.045455Hydrogen 0.11 0.11 0.1CO 0.02 0.02 0.018182CO2 0.48 0.48 0.436364Nitrogen 0.16 0.16 0.145455Methanol 0 0 0.090909Acetone 0 0 0Heptanol 0 0 0Ethanol 0 0 9.09E-12
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Analysis Assignment Don Robinson
ProductProduct Product
Methane 0.179998 0.163636Water 0.05052 0.045752Hydrogen 0.109831 0.099906CO 0.020046 0.018221CO2 0.478724 0.435639Nitrogen 0.159998 0.145455Methanol 0.000883 0.091389Acetone 2.15E-13 9.8E-13Heptanol 9.55E-11 3.19E-10Ethanol 3.24E-07 1.75E-06
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Analysis Assignment Don Robinson
Forward Rate Const. Calcs Consider the simple case of A + B C Rate = kf [A] [B] Rate in moles per hour per m3
[A],[B] in moles/m3
Base rate on void volume (void fraction = .33)
What is the missing parameter?
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Analysis Assignment Don Robinson
Molar Density Required to convert mole fraction to
moles/m3 Get from HYSYS model “Start.hsc”
on CD in “Files” Suggestion: Get one density (at
average feed conditions) for each temperature you are going to run at and apply this to the whole reactor
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Analysis Assignment Don Robinson
Variation of K,kf,kr With T Arrhenius equation k = A*exp(-E/RT) Since we will know the k’s at two
different T’s, the only issue is what value of R to use
Perry’s Handbook has a table of R values in various units
HYSYS wants E in kJ/kg-mol
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Analysis Assignment Don Robinson
Entering Data in HYSYS
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Analysis Assignment Don Robinson
Check Base, Phase, Units
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Analysis Assignment Don Robinson
Schedule A group: Today, Friday, next week
Wednesday B group: Wednesday, next week
Monday, Friday If necessary a session on Saturday
27th
Due at start of class Monday September 29