3835

3627

كارشناسي ارشد

مهندسي شيمي

اصفهان :دانشگاه صنعتي اصفهان ، دانشكده مهندسي شيمي

1386

شانزده، 142، [II] ص: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

29/11/86

شاپور رود پيما، محمد رضا احساني

مهندسي شيمي

ID3627

به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال

Abstract At present mannitol is imported in Iran and is obtained by chemical reaction orextraction with liquid solvents in other countries Both methods have some problemswhich made them not favorable Therefore research in developing an effective method inmannitol production is needed In this thesis an attempt was made to extract mannitol fromOlive Tree leaves in vitro by using three methods supercritical CO2 extraction subcriticalwater extraction and organic liquid extraction Furthermore the effects of importantsolvent extraction parameters such as temperature pressure extraction time and entrainerand also Reynolds and Peclet Numbers on extraction efficiency and distribution coefficientwere investigated Experimental results of SC CO2 extraction showed that pressure increase from 200 to350 bar boosted extraction efficiency due to density increase In addition temperaturedecrease from 80 to 40 C increased extraction efficiency due to density increase Furthermore increasing the extraction time from 10 to 90 min boosted the extractionefficiency but from that time no more changes in extraction efficiency was realizedbecause the necessary driving force does not exist Ethanol as an entrainer in the range of0 20 v v was used and high extraction efficiency was obtained by 20 of ethanol Mathematical modeling of experimental data was investigated and the model is able topredict the experimental data well Experimental results of subcritical water extraction showed that although change offlow rate from 0 2 to 2 mL min had no effects on extraction efficiency temperatureincrease from 60 to 150 C and pressure increase from 30 to 110 bar had an optimum pointin extraction efficiency The optimum operating condition was obtained to be 100 C and50 bar Furthermore there was no change in extraction efficiency when Reynolds andPeclet Numbers changed Mathematical modeling of experimental data was also done andthe model can predict the experimental data quite well To compare with two other methods Soxhlet organic liquid extraction wasinvestigated Experimental results showed that subcritical water extraction had the highestextraction efficiency and SC CO2 extraction had the lowest Although SC CO2 extractionhas no high extraction efficiency its distribution coefficient is lower than organic liquidextraction which it shows the economical advantage based on use of lower SC fluid incomparison with organic solvent

شاپور رود پيما، محمد رضا احساني