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Partial Oxidation of Benzene to Maleic Anhydride. Derek Becht Mike Raymond Eric Nette Matt Hunnemeder. Overview. Project Description Background Assumptions Solution Methodology Final Design Overall Comparison. Project Description. Reaction: Partial oxidation of benzene

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partial oxidation of benzene to maleic anhydride

Partial Oxidation of Benzene to Maleic Anhydride

Derek Becht

Mike Raymond

Eric Nette

Matt Hunnemeder

overview
Overview
  • Project Description
  • Background
  • Assumptions
  • Solution Methodology
  • Final Design
  • Overall Comparison
project description
Project Description
  • Reaction: Partial oxidation of benzene
  • Reactor: Fixed bed reactor
  • Production: 50000 M tons/year maleic anhydride
  • Step by step modeling process

Fogler H.S. Elements of Chemical Reaction Engineering; Pearson Education: New Jersey, 2006.

financial considerations
Financial Considerations
  • Market Price3,4
    • Maleic Anhydride: $1.54/kg - $ 1.70/kg
    • Benzene: $929.99/m3 – $940.55/m3
  • Financial Earnings
    • $20,922,183/yr neglecting all cost, except feed
standard assumptions
Standard Assumptions
  • Open system + steady state
  • Negligible potential and kinetic energy
  • No mechanical or shaft work
  • Turbulent flow
    • Uniform temperature, pressure, and concentration within the control volume
  • 2 weeks downtime
benzene specific assumptions
Benzene Specific Assumptions
  • 1.1 mol % inlet benzene5
  • Conversion, XB, is 0.76 6
  • Dry air
  • Negligible CO2 in air

A. Bielanski, M. N. (1997). V2O5-MoO3 Catalysts for Benzene Oxidation. Applied catalysts , 223-261.

reactor and particle properties
Reactor and Particle Properties
  • Bulk Density7 = 930 kgcat/m3
  • V2O5-MoO3 Particle Diameter8 = 0.006m
  • Void Fraction = 0.4 m3gas/m3rxtr
  • Heat Transfer Coefficient8 = 202.4 W/m2-K
  • Coolant Temperature8 = 653 K
solution methodology
Solution Methodology
  • Ideal Reactor -> Realistic Reactor
  • Considerations:
    • Pressure drop
    • Side reactions
    • Temperature rise/drop
case 1 ideal reactor
Case 1: Ideal Reactor
  • Assumptions Reaction Kinetics
    • Isothermal
    • One reaction
    • Isobaric
  • Inlet Conditions Feed Rates
    • 658 K Benzene: 0.02122 kmol/s
    • 1.5 atm Oxygen: 0.4177 kmol/s
    • 1.1 mol% benzene Nitrogen: 1.577 kmol/s
case 2 pressure drop
Case 2: Pressure Drop
  • Additional Assumptions Momentum Equations
    • Ideal Gas
    • Constant Density
  • Additional Property
    • Viscosity9 = 3.2197E-5 PaS
case 3 multiple reactions
Case 3: Multiple Reactions
  • Mechanism Rate Expressions

2 C6H6 + 6 O2 -> 3 C4H2O3 + 3 H2O

C6H6 + 6 O2 -> 3 CO + 3 CO2 + 3 H2O

case 4 energy balance
Case 4: Energy Balance
  • Additional Assumptions
    • Constant heat capacity
    • Constant coolant temperature
    • Multi-tube reactor
final design optimization
Final Design: Optimization
  • Pressure
  • Temperature
references
References

1) Barone et al., United States Patent 4018709. Patent Issued 1977.

2) Maleic anhydride - Chemical Profile. <http://www.the-innovation-group.com/ChemProfiles/Maleic%20Anhydride.htm>. (accessed 01/24/2008).

3) William Lemos. US Price Report – Maleic Anhydride. <http://www.icis.com/v2/chemicals/9076024/maleic-anhydride/pricing>. (accessed 01/25/2008).

4) Americas Market Summary – Benzene. http://www.icis.com/articles/2008/01/29/9096633/NOON-SNAPSHOT. (accessed 01/24/2008).

5) Sharma R.K. et al. (1984). Selective Oxidation of Benzene to maleic anhydride at Commercially Relevant Conditions. Institution of Chemical Engineers Symposium Series, 353-360.

6) Americas Market Summary – Benzene. http://www.icis.com/articles/2008/01/29/9096633/NOON-SNAPSHOT. (accessed 01/24/2008).

7) U.S. Patents. (1996). Oxide catalyst and process for producing maleic anhydride by oxide catalyst (No. 266510 filed on 1994-06-27).

8) U.S. Patents. (1978). Process for the Manufacture of Maleic Anhydride (No. 4070379 filed on 10/21/1976). http://www.freepatentsonline.com/4070379.html

9) Chemical Database Property Constants. DIPPR Database [Online]. Available from Rowan Hall 3rd Floor Computer Lab. (Accessed on 1/24/2008).