Filtered Smith Predictor to control pH during enzymatic hydrolysis of microalgae to produce l-aminoacids concentrates

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1、ChemicalEngineeringScience82(2012)121–131ContentslistsavailableatSciVerseScienceDirectChemicalEngineeringSciencejournalhomepage:www.elsevier.com/locate/cesFilteredSmithPredictortocontrolpHduringenzymatichydrolysisofmicroalgaetoproduceL-aminoacidsconcentratesa,nbbaaJ.M.Romero-Garcı´a,J.L.Guzma´

2、n,J.C.Moreno,F.G.Acie´n,J.M.Ferna´ndez-SevillaaDepartmentofChemicalEngineering,UniversityofAlmerı´a,04120Almerı´a,SpainbDepartmentofComputerScience,UniversityofAlmerı´a,04120Almerı´a,SpainHIGHLIGHTScAnexperimentalpHmodelwithdelayanduncertaintyintheparametersisobtained.cAFilteredSmithPredictor(

3、FSP)forapHrobustcontrolisdesigned.cControlsystemisverifiedinsimulationandimplementedintherealsystem.cRealresultsshowareductionofa25%oftheIAEandtheinjectiontime.cProductionofaminoacidsincreasesnearly5%withrespecttoon–offcontrol.articleinfoabstractArticlehistory:ThemainstepoftheproductionofL-amin

4、oacidsconcentratesfrommicroalgaeistheenzymaticReceived16April2012hydrolysis.ThisprocesshastobedoneattheoptimumtemperatureandpHoftheenzymeinordertoReceivedinrevisedformobtainthemaximumyield.InordertokeepaconstantpH,NaOH(1M)orH2SO4(1M)areused,5July2012dependingonthereactionstep.WhenworkingwithpH

5、itisnotpossibletousethegoverningequationsAccepted13July2012duetothecomplexityoftheenzymatichydrolysis.Inthiswork,themodellingofpHisexperimentallyAvailableonline23July2012performedonalaboratoryscaleplant.SincetheobtainedmodelpresentsdelayanduncertaintyintheKeywords:parameters,aFilteredSmithPred

6、ictorisproposedascontrolstrategy.ThiscontrolschemehasbeenBatchbioprocesstestedintherealsystem.TheFilteredSmithPredictorhasreducedtheIntegralAbsoluteErrorandtheEnzymatichydrolysistimeforthesolutionadditioninmorethan25%andithasincreased5%theproductionofL-aminoacidsMicroalgaefree-aminoacidscompar

7、edtoanon-offcontrol,whichisthecontrollermostusedintheseprocesses.Nonlineardynamics&2012ElsevierLtd.Allrightsreserved.pHrobustcontrolFilteredSmithPredictor1.Introductionfromphotosyntheticmicroorganisms,suchasmicroalgaeandcyanobacteria.Cu