Transcript Project Work Week 2.pptx

Project Work
Week 2
Terry A. Ring
Chemical Engineering
Project Schedule
Progress Report Memo
• Introduction
• Body
• Give and Report on the Old Gantt Chart
• State past progress and list what has been finished
• Discuss the progress since the last progress report.
• Explain any overdue problems
• Why they occurred
• Implication on project
• Efforts you will use to overcome problems
• Conclusion
• Give prognosis for total project
Progress Report Ghantt Chart
Activity
15
Jan.
2003
Set up envelopes for various
expenses
Adjust investment portfolio
Collect all Expenses
Purchase Tax Software
Collect W2, Capital Gains, 1099,
K-1 (partnership) forms
Compile expenses
Use tax software to fill in forms
Pay IRA’s, self-employed pension
plan
Check tax forms, Pay tax due and
file tax forms
x
x
15
July
2003
15
Dec.
2003
15
Jan.
2004
15
Feb.
2004
x
x
x
x
x
x
x
x
x
15
March
2004
15
April
2004
x
x
x
AIChE Contest Problem
• Price of Chemical from Lab Supply company
• 100 gm at $100 = $1,000/kg
• What should be the price when I buy in bulk
• Typically a 100% markup for the lab supply industry
• $500/kg
Methanol Process
500 psia
T=?
Process Flow Diagram
Syn Gas
Purge Gas
to Fuel
Make-Up Gas
Compressor
Light-ends
Column
Spec MeOH
Purge
Heavy-ends
Column
Recycle
Compressor
Methanol
Converters
T=?
CWS
CWR
T=250C
P=?
High-pressure
Separator
Low -pressure
Separator
P=?
Heavy
Alcohol
Water
Purge on Loop
• Design Spec Failure
• Some feed is leaving with the liquid
• Set design spec with
• Purge + liquid loss at HP flash = feed
Reactor
• Impurities
• Dimethyl ether
• Methyl formate
• Butanol
• Easiest way
• Add a side stream after reactor with a flow of each of these chemicals after you have
determined the flow of methanol out of the reactor
• More complicated way but a bit more rigorous
• Add a RStoic reactor with 3 reactions
• Set a design specification on reaction conversion to get the amount of impurity
needed
• 2CO + 4 H2  C2H6O + H2O
• 2CO + 2H2  CH3OCOH
• 4CO + 8H2  C4H9OH + 3 H2O
(dimethyl ether) 0.00024 lb/lb methanol
(methyl formate) 0.0012 lb/lb methanol
(butanol)
0.00026 lb/lb methanol
Reactors
• Size of Reactor
• Very Long
• Large number of tubes
• Break up reactor into sizes that makes sense
• Put reactors in Series or Parallel
• All reactors are plug flow so you can break these up as you like
Turbine in place of Valve
• Turbines in Aspen are typically used to generate work for Gas Systems
• Gas Turbine
• You may get some errors if you us a turbine on a liquid stream
• Apologies to Jason McHan (and others)
• When we talked I mistook his stream for the gas stream when talking about adding a turbine
Separation System
• Having trouble with the complex Distillation Column #2
• Hard Way – PetroFrac with extra side streams
• You do not need to use PetroFrac, etc with extra side streams
• Easy Way – Sequence of Distillation Columns
• You can use a sequence of distillation columns
Separation Problem
• Components
BP(C)
•
•
•
•
•
•
CO
CO2
N2
H2
CH4
H2O
100C
•
•
•
•
Methanol
Dimethyl ether
Methyl formate
N-Butanol
65C
-24C
32C
117C (n)
• 98C (2-butanol)
HP/LP Flash System
83C(t-butanol)
107C(i-butanol)
Distillation Sequence – Tower 1
• Dimethyl ether
-24C
• Remove in HP/LP Flash System or PC on First Tower
LK
HK
•
•
•
•
Methyl formate
Methanol
H2O
N-Butanol
• 98C (2-butanol)
32C
65C
100C
117C (n)
83C(t-butanol)
107C(i-butanol)
Distillation Sequence – Tower 2
LK
HK
•
•
•
•
Methyl formate
Methanol
H2O
N-Butanol
• 98C (2-butanol)
• HK could be
32C
65C
100C
117C (n)
83C(t-butanol)
t-butanol
107C(i-butanol)
Week 1 slides
Kinetics
• Problem Statement
• Rate in kmole/m^3/s
• Partial pressure in kPa
• Aspen Help LHHW Kinetics
• gives Aspen’s Required Units
• Rate basis = reactor volume (or kg of catalyst rate [kmole/kg/s])
• Rate has units kmole/m^3/s
• Concentration Basis
• Partial Pressure has units of N/m^2 or Pa
• This assumes that the equilibrium constants, Ki’s, are pressure equilibrium constants, Kp with
units in Pa^(-n)
• ln(K)=A+B/T+C ln(T)+DT
• A=ln(K), K is Kp made unitless by multiplying by Pa^n
Kirk-Othmer Methanol.pdf
in ARTICLES section of Course Website
Manufacturing Process
Methanol Conversion Reactor – Steam Generator
500,000 Tonne/yr