Chemical Engineering 140. Chemical Process Analysis C.J. Radke Tentative Schedule Fall 2013
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1 Chemical Process Analysis C.J. Radke Tentative Schedule Fall 2013 Week 0 *8/30 1. Definition of Chemical Engineering: flow sheet, reactor trains and separation processes, raw materials, power production and CO2 separation, Artemisinin production in e-coli bacteria. Week 1 9/02 LABOR DAY 9/04 2. The chemical-engineering tool box, Conservation of mass: Overall (total) mass balance. Meaning of mass and molar densities 9/06 3. Unsteady filling of a tank with liquid: control volume and Matlab numerical solution of a 1 st order ODE. Basis of RK algorithm, How to draw graphs, Definitions of unsteady state, steady state, and equilibrium Week 2 9/09 4. Steady-state example (mixing in a tee), Unsteady filling of a tank with an ideal gas: constant control volume. 9/11 5. Unsteady species balance with no chemical reaction: species balances (# of independent species balances). Washout of salt from a tank: dilute solutions, Meaning of residence time. 9/13 6. Unsteady species balance with chemical reaction: well-mixed, homogeneous reactions, Meaning of reaction rate, Steady state CSTR with 1 st order irreversible kinetics, Week 3 9/16 7. Definition of conversion. Controlling conversion by residence time, Comparison of conversion between a BSTR and a CSTR. Start-up of a CSTR with 1 st order irreversible kinetics. Approach to steady state. Definition of residence time vs reaction time constants 9/18 8. Mathematical solution of ODEs: Characterization, General integrating factor solution for 1 st order ODEs, Summary chart of equation types. Illustration of Matlab for nonlinear ODEs. Page 1 of 5
2 9/20 9. Steady mass balances. Species balances at steady-state with no chemical reaction: Basis selection. Simultaneous linear equations, Solution by Matlab. Degrees of freedom. Week 4 *9/ Multiple units: two distillation columns, Lack of independence of control volumes, Definition and use of tie components. DoF Analysis, Steady element balances with chemical reaction 9/ Combustion of heptane. Degree of freedom analysis, Excess air, Element balances, Solution for systems of algebraic, equations using Matlab. 9/ Reaction stoichiometry and conversion, Application of conversion to combustion of heptane, Stoichiometry and extent of reaction, Application of extent of reaction to combustion of heptane Week 5 9/ Production of rutile from Sorel slag 10/ Review of the tool box. Chemical reaction equilibria: The ultimate conversion, Criterion for reaction equilibria: chemical potential change upon reaction. Equilibrium constants: The missing one! Comments on the methanol economy. 10/02 MIDTERM #1 10/ Methanol from syngas, Equilibrium constants to obtain ultimate conversion: Use of conversion, extent of reaction, and element balance. Solution of single nonlinear algebraic equations by Succesive Substitution and Newton-Raphson iteration: application to methanol synthesis. Week 6 10/ Effect of pressure on equilibrium conversion, LeChatelier s principle for role of P. Effect of temperature on K and equilibrium conversion. Endothermic vs. exothermic reactions, Calculation of K from standard heats of reaction. LeChatelier s principle for role of T on equilibrium conversion 10/ Ammonia synthesis. Importance of fertilizers in world food production. Design of an ammonia synthesis gas plant. An ammonia synthesis gas plant, steam reforming, watergas shift rxn, burn out of oxygen, inerts that are in air, Plug flow (or packed-bed) reactor. What is a catalyst? Page 2 of 5
3 10/ Equilibrium constraints on ammonia PFR reactor operating conditions: Need for high pressure and low temperature. Ammonia synthesis: condenser, recycle, and purge, Mass balance on Haber process. Week 7 10/ Ammonia synthesis: recycle ratio, overall conversion vs. single-pass conversion, single and multipass heat exchangers 10/ Schematic of Haber-Bosch process. Design of ammonia reactor: species balances on a PFR. 10/ Incorporation of realistic kinetics into design equation, Application of Runge-Kutta numerical solution of PFR design equation (Matlab). Scaling to a production-size reactor Week 8 10/ Effect of temperature on ammonia reactor size and conversion, LeChatelier vs. Arrhenius in ammonia-reactor design. Heat transfer in ammonia reactor. Actual reactor configuration. Pressure-Volume-Temperature properties for pure fluids: isothermal compression/expansion of an ideal gas. Lennard-Jones interactions 10/ van der Waals equation of state and its physical origin. Isothermal compression/expansion of a real gas, Gas/liquid phase transition: dew points, bubble points, binodal, spinodal. Definition and meaning of quality in the twophase region. 10/ Fluid phase equilibrium: equality of chemical potential, Why do liquids (and solids) form? Vapor pressure, Antoine s equation. Pressure-temperature diagrams, Critical point, Law of corresponding states. Week 9 10/ Gibbs phase rule. Steam tables, superheated steam, saturated steam, compressed liquid, Finding properties in Regions I-III of steam tables. Real fluids: The complete phase diagram. Location of triple point and critical points, solid/vapor and solid/liquid equilibria. 10/ Multicomponent L/V phase equilibria, Ideal gas and ideal liquid mixtures, Raoult s law, Setting the temperature of the ammonia condenser by Raoult. K factors for nonideal mixtures 11/ Flash/condenser calculations by Newton iteration. Equilibrium ammoniacondenser design Page 3 of 5
4 Week 10 *11/ Limits on flash/condensation conditions: multicomponent bubble and dew points. Water/air phase equilibria, air saturated with water vapor *11/ Partial water saturation in air, Relative humidity, Humidity, Liquid/liquid phase equilibria, Nernst partition coefficient, Extraction 11/06 MIDTERM # 2 *11/ Distribution/partition coefficient, Extraction equilibrium, Concepts in separation processes: Equilibrium stages and mixers/settlers, Concept of equilibrium stage, Mass transfer flux, characteristic time Week 11 11/11 VETERAN S DAY 11/ Equilibrium Concepts in Separation Processes cont: Multistaging, cross, co, counter current flow, Kremser equation, Distillation and extraction towers 11/13 Writing skills (voluntary) 11/ Energy conservation: forms of energy: internal energy. State functions, Definition of work and power. Path vs state functions, Reversible work, PV work in expansion of a piston. Heat transfer flux, Definition of overall and individual heat transfer coefficients, Week 12 11/ Concept of heat transfer resistance by analogy to Ohm s law, Heat transfer resistances in series, General unsteady energy balance, Flow work vs shaft work, Introduction of enthalpy 11/ Unsteady closed form (the First Law ), Steady open form of general energy balance ( Enthalpy Balance ). Steady mixing of hot and cold fluids in a tee 11/ Transient steam heating of liquid in a CST, Characteristic time. Steady steam tracing of a liquid in a CST. Steam exit quality. Week 13 11/ Enthalpy balances with chemical reaction. 11/27 No class Page 4 of 5
5 11/29 THANKSGIVING Week 14 12/ Standard heats of reaction. Steam reforming of methane +12/ Evaluation of sensible and latent enthalpy changes, Adiabatic flame temperature (Thanksgiving makeup lecture) *12/ Production of calcium oxide from limestone: Charting steady enthalpy balances. 12/ Design of double pipe heat exchanger Week 15 12/ Review, Course evaluation forms. 12/16 Monday, December 16, 7-10 p * indicates instructor s absence + indicates makeup lecture FINAL EXAMINATION Page 5 of 5
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