25 - Multicomponent Distillation Concepts
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Transcript of 25 - Multicomponent Distillation Concepts
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MULTICOMPONENT DISTILLATION
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SINGLE STAGE FLASHUSES TWO PHASE EQUILIBRIUMFLASHBUBBLE POINTDEW POINTCAN BE TWOLIQUID PHASESUSES RELATIVE VOLATILITY
http://www.hills2.u-net.com/chemical/distil/fig17.gif
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METHODS TO OBTAIN KiEMPIRICAL DATASET UP EXPERIMENTS TO MEASURE y = y(x,P,T)FIT TO STANDARD CORRELATIONS DATA CAN BE BASED ON BINARY SETS - SEE PERRY'S SECTION 13 FOR BINARY DATA GENERAL CORRELATIONS FOR SPECIFIC TYPES OF MIXTURES - UNIQUAC
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METHODS TO OBTAIN KiDEPRIESTER CHARTS FOR HYDROCARBON SYSTEMSLOW TEMPERATURE DATAPERRYS FIGURE 13-14, P. 13-17
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METHODS TO OBTAIN KiDEPRIESTER CHARTS FOR HYDROCARBON SYSTEMSHIGH TEMPERATURE DATAPERRYS FIGURE 13-14, P. 13-18
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METHODS TO OBTAIN KiAIR SEPARATION PLANT DATAhttp://www.cryogenic-consulting.com/argon.pdf#search=%22AIR%20SEPARATION%20EQUILIBRIA%22
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FLASH CALCULATIONSBUBBLE POINT PRESSURE (DIRECT)T AND xi ARE GIVEN, FIND yi AND P
BUBBLE POINT TEMPERATURE (T & E)P AND xi ARE GIVEN, FIND yi AND T
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FLASH CALCULATIONSDEW POINT PRESSURE (DIRECT)T AND yi ARE GIVEN, FIND PSYS AND xi
DEW POINT TEMPERATURE ( T & E)P AND yi ARE GIVEN, FIND T AND xi
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FLASH CALCULATIONSPARTIAL FLASH zi = 1P, T AND zi ARE GIVEN, FIND xi & yiFLASH LINES ARE DEVELOPED FOR EACH COMPONENT WITH A COMMON f
SOLVE BY T&E FOR VALUES OF V IN f = V/F
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MULTICOMPONENT FRACTIONATIONGENERAL DESIGN CONSIDERATIONSSPECIFY PRESSUREDETERMINE NUMBER OF EQUILIBRIUM STAGESADJUST NUMBER OF STAGES FOR STAGE EFFICIENCYDESIGN TRAYSDESIGN COLUMNhttp://www.eia.doe.gov/kids/energyfacts/sources/non-renewable/images/FCCDistCol.jpg
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SHORTCUT METHOD - PSEUDOBINARY SEPARATIONASSUMES TWO PRIMARY (KEY) COMPONENTS CAN BE USED TO MODEL THE PROCESSNON-KEYS ARE DISTRIBUTED BASED ON i,KEYKEY COMPONENTSDISTRIBUTED TO DISTILLATE & BOTTOMSMAJOR COMPONENTS IN FEEDNON-KEY COMPONENTSLIGHTER THAN LIGHT ARE ASSUMED TO GO TO DISTILLATEHEAVIER THAN HEAVY ARE ASSUMED TO GO TO BOTTOMSINTERMEDIATE ARE ASSUMED TO DISTRIBUTE TO DISTILLATE AND BOTTOMShttp://image.absoluteastronomy.com/images/encyclopediaimages/d/di/distillation_column.png
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COMPONENT DISTRIBUTIONSEXAMPLE FROM AIR SEPARATIONKEYSO2N2NON-KEYArhttp://www.cryogenic-consulting.com/argon.pdf#search=%22AIR%20SEPARATION%20EQUILIBRIA%22
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SHORTCUT METHODDISTRIBUTE KEYS BASED ON TARGET PRODUCT COMPOSITIONCOMPLETE DISTRIBUTION TO YIELD FEED AND PRODUCT MATRICESxFi, xDi, xBiCALCULATE NMIN WITH FENSKE EQUATION USING KEY VALUES
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SHORTCUT METHODAVERAGE RELATIVE VOLATILITY, LK,HKFEED VALUE
TOP/BOTTOM AVERAGE
GEOMETRIC AVERAGESOVERALLTOP/BOTTOM
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SHORTCUT METHODCHECK OF NON-KEY DISTRIBUTIONUSE FENSKE EQUATION RESOLVED FOR NON-KEY RELATIVE TO KEY:
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SHORTCUT METHODMINIMUM REFLUX RATIOOPERATING LINES FOR EACH COMPONENT AT TOTAL REFLUXRECTIFICATION SECTION
STRIPPING SECTION
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SHORTCUT METHODUNDERWOOD EQUATIONS COMPLETE BALANCE OVER THE COLUMN
NUMBER OF VALUES ARE (1 + NUMBER OF COMPONENTS BETWEEN KEYS)VALUE OF IS BETWEEN VALUES OF ij
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SHORTCUT METHODUSE GILLILAND OR ERBAR-MADDOX CORRELATIONS TO DETERMINE N FOR A SPECIFIC RdMolokanov, International Chemical Engineering, 12(2), 209, 1972McCabe, Smith and Harriontt, Unit Operations of Chemical Engineering, Ed. 4, p, 578, 1985.
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SHORTCUT METHODLOCATION OF FEED TRAYIS CRITICAL TO COLUMN EFFICIENCYLOSS OF SEPARATION INCOMPLETE SEPARATIONBASIS FOR ESTIMATE