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Objectives and Constraints
LIMITATIONS ON ENERGY TRANSFER
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absorbent accumulator level acetate achieved acid adjusted azeotrope benzene binary boiling point boilup bottom product Btu/lb butane bypass calculated column pressure components compressor constraint control loop control valve cooling cost curve decoupling described distillate flow distillation columns dynamic effect energy enthalpy entropy equations equilibrium ethane example extractant extractive distillation feed composition feed rate feedback feedforward figure flooding flow rates fraction fuel function furfural heat input heat transfer heat-transfer increase interaction isobutane isopentane level controller limit liquid phase loss manipulated variable material balance material-balance maximum methanol mixture mole fraction n-butane operation optimization optimum overhead vapor percent pressure controller product quality propane psia pump purity ratio reboiler recovery reduced reflux reflux flow refrigerant relationship relative gain relative volatility reset response sensible heat sensitivity set point shown in Fig specifications steam flow stripping column theoretical trays thermosiphon tion vapor flow vapor pressure variations varies zero