Chemical Engineering Process Analysis

Profitability of a chemical process involving the conversion of H2O and CH4 to CO2 and H2O through catalytic reactions. The analysis includes kinetics rate expressions, Aspen unit conversions, and determining the units for various terms in the process equations. The content covers the steps required to convert between different units and understand the underlying calculations in chemical engineering processes.

• Chemical Engineering
• Process Analysis
• Reaction Kinetics
• Aspen Units
• Unit Conversions

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Presentation Transcript

1. HW 6 Help Terry A Ring Chemical Engineering University of Utah

2. Problem Is this process profitable H2O CH4 + O2 CO2+H2O

3. Chem. Eng. Chem. Eng. Process., Process., 21 (1987) 21 (1987) 179 179- -191 191 Abstract

4. Kinetics Rate Expression Catalytic Reaction (1 site at surface)

5. Aspen Units - Rate=kTn e[-E/RT]Cii i Rate Units When Rate Basis is Cat (wt), substitute sec kg catalyst for sec m3in each expression above. For either rate basis, the reactor volume or catalyst weight used is determined by the reactor where the reaction occurs.

6. Aspen Kinetics This is from Aspen Help

7. Aspen Units - LHHW

8. We must put Kuczynski Units into Aspen Units What are the Units of each term? EA/R=9032*K Po = 0.1 MPa = 100 kPa = 1 atm

9. Break in Numerator and Denominator Units of Denominator? Unitless!! Units of Numerator? Mole CO/kg cat/s

10. How to Convert Denominator to Aspen Units Aspen Units Pressure is in Pascals Kuczynski Units Po = 0.1 MPa = 100 kPa = 1 atm

11. Denominator 2nd Term KCO CO Po in Pascals [Pa]B KCO[Po/Po] CO (KCO/Po)*(Po CO) [1/Pa]*[Pa]

12. How to Convert Numerator to Aspen Units 1st Term k1 CO H22 k1[Po3/Po3] CO H22 (k1/Po3)*(Po3 CO H22) [1/Pa3]*[Pa3]