By Norman W. Loney
DIFFERENTIAL EQUATIONS creation traditional Differential Equations version improvement References FIRST-ORDER traditional DIFFERENTIAL EQUATIONS Linear Equations more information on Linear Equations Nonlinear Equations challenge Setup difficulties References LINEAR SECOND-ORDER AND structures OF FIRST-ORDER usual DIFFERENTIAL EQUATIONS advent basic ideas of the Homogeneous Equation Homogeneous Equations with consistent Coefficients Nonhomogeneous Equations Variable Coefficient difficulties substitute equipment precis functions of Second-Order Differential Equations. Read more...
summary: DIFFERENTIAL EQUATIONS creation traditional Differential Equations version improvement References FIRST-ORDER traditional DIFFERENTIAL EQUATIONS Linear Equations more information on Linear Equations Nonlinear Equations challenge Setup difficulties References LINEAR SECOND-ORDER AND platforms OF FIRST-ORDER usual DIFFERENTIAL EQUATIONS creation basic strategies of the Homogeneous Equation Homogeneous Equations with consistent Coefficients Nonhomogeneous Equations Variable Coefficient difficulties substitute equipment precis purposes of Second-Order Differential Equations
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Additional info for Applied Mathematical Methods for Chemical Engineers, Second Edition
2. 3. 4. 1). Express stream-flow rates on solute-free basis. Assume steady flow rate for each phase. Assume that toluene and water are immiscible. 1 Equilibrium stage. 5. Assume that feed concentration is constant. 6. 1) are always in equilibrium with each other and can be expressed as y ¼ mx (2:56) where m is the distribution coefficient, x is the concentration of benzoic acid leaving the stage in the organic phase, and y is the aqueous phase benzoic mass concentration. 7. Assume that the composition of a stream leaving the stage is the same composition as that phase in the stage.
Assume that the size distribution of particles is uniform throughout the mill and equals that of the product, and let xif be the mass fraction of the feed that falls in the ith size range. Show that a mass balance on the jth size fraction in the tank yields X dxj ¼ ðQ=MÞ(xjf À xj ) À kj xj þ ki xi bij dt i¼1 jÀ1 Solution Accumulation ¼ Input þ Generation À Output À Consumption dxj d Accumulation ¼ (Mxj ) ¼ M dt dt Input ¼ Qxif Generation: the rate at which particles enter the jth size fraction from the ith size fraction by breakage is kimibif.
Assume that feed concentration is constant. 6. 1) are always in equilibrium with each other and can be expressed as y ¼ mx (2:56) where m is the distribution coefficient, x is the concentration of benzoic acid leaving the stage in the organic phase, and y is the aqueous phase benzoic mass concentration. 7. Assume that the composition of a stream leaving the stage is the same composition as that phase in the stage. 8. Assume that the stage initially contains V1 liter of toluene, V2 liter of water, and no benzoic acid.