بهينه سازي جداسازي تركيبات قابل تخمير به وسيله هيدروليز اسيدي ضايعات توده هاي زيستي

چكيده انگليسي :

Optimization of Fermentable Components Separation by Dilute Acid Hydrolysis of Waste Biomass Hamzeh Hoseinpoor Hamzeh Hoseinpoor@yahoo com Date of Submission October 30 2009 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language farsiKeikhosro Karimi karimi@cc iut ac irAbstractNoting increasing consumption of energy and fossil fuel sources and their poluting effects it is necessary to findrenewable and clean sources of energy which can substitute fossil fuels To meet this demand industrial societieselect use of biomass and converting it into biogas and bioethanol as sustainable and clear energies The first andmost important step in biomass conversion to bioenergy is pretreating them to change their structure and chemicalconstruction in order to increase and fluence the yield of hydrocarbon particles hydrolysis into monomeric sugars Nowadays in some industrial societies some plants like wheat are cultivated only for bioenergy prodution Theseplants are an important source of starch and lignocellulose Moreover it can be found huge mixtures of starchy andlignicellulosic in agriculture and municiple solid wastes In order not to destruct starchy components in harshconditions applied for lignocellulosic components hydrolysis they should be separated which need high cost andlong times There are rare researches about the possibility of accessibility to a conditions in which dilute acidhydrolysis pretreatment results in maximum production and minimum destruction of fermantable monomeric sugarsand conversion to inhibitors This project can divided into three stages In the first stage dilute acid hydrolysis ofpure cellulose Avicel and starch was done at the range of middle temperatures 70 150 C time 0 40 minutes acidconcentration 0 1 v v and material concentration 5 15 w v In this stage the software and Central CompositeDesign was used for experimental design and analysis In the optimized condition of 130 C 30 minute acidconcentration of 1 and material concentration of 7 5 almost all of the starch was converted into glucose whitoutinhibitor production However maximum yield of glucose production from cellulose was in the optimized conditionof 150 C 40 minute acid concentration of 1 and material concentration of 15 in which only 3 3 ofcellulose converted into glucose But in this operation condition the amount of glucose in starch hydrolyzateintensively decreased because of destruction Therefore with due attention to very low conversion of cellulose thementioned conditions for total conversion of starch to glucose was chosen as optimized condtion of dilute acidhydrolysis pretreatment and in the second stage pine wood and potatoe as representatives of lignocellulosic and was hydolysed by starchy components were hydrolysed under this condition In the third stage pretreated woodenzymes In this operation the effect of Cellulase 15 30 FPU g Dry Mass and Cellulase and glucosidaseloading and solid concentration 2 5 10 on the yield of enzymatic glucosidase 30 60 IU g Dry Mass conversion were studied Maximum conversion of cellulose to glucose about 76 was happened in Cellulase and glucosidase loading of 30 FPU and 60 IU g DM and solid concentration of 2 Key Words Lignocellulose cellulose Starch Acid Pretreatment Enzymatic Hydrolysis

حسين پور، حمزه

بهينه سازي جداسازي تركيبات قابل تخمير به وسيله هيدروليز اسيدي ضايعات توده هاي زيستي

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