Producing ashless coal extracts via different extraction methods

ABSTRACTMScPRODUCING ASHLESS COAL EXTRACTS VIADIFFERENT EXTRACTION METHODSAylin KURMANDEPARTMENT OF CHEMISTRYINSTITUTE OF NATURAL AND APPLIED SCIENCESUNIVERSITY OF ÇUKUROVASupervisor : Doç.Dr. E.Sultan GİRAYYear: 2006, Pages:111Jury: Prof.Dr. E. Sultan GİRAYProf.Dr. Oktay ERBATURProf.Dr. Mesut ANILTo produce ashless coal, three kind of extraction methods were applied. FourTurkish coals (two bituminous and two brown coals) were extracted with NMP/CS2(1:1 v/v) and NMP/EDA (17:1 v/v) mixed solvents at room conditions and withNMP alone and NMP/EDA mixed solvent under reflux. To obtain any effect ofsolvent swelling on extraction yield, the coals were extracted at same conditionsafter swelling with NMP and EDA. Also, a qualitative information regarding thestructural characteristic of extract was obtained by FT-IR analysis. The results haveindicated that swelling ratio was higher in EDA and the extraction yields generallyincreased after swelling with EDA, especially for brown coals. NMP/EDA mixedsolvent was found a better solvent for low-ranked coals under reflux conditions thanNMP/CS2 at room temperature while for bitiminous coal NMP/CS2 mix were bettersolvent at room conditions. The extraction of EDA swollen Soma coal withNMP/EDA mixed solvent under reflux gave an extraction yield of about 53 %which was the highest extraction yield at all extraction conditions, suggesting theuseful effect of solvent swelling and heat during the reflux. While the raw lignitesgave lower extraction yield in all cases, a significant increase in extraction yieldwere observed for acid treated ligites. Following the extraction, the solid extractswere produced an ash content ranging from %0.02 to % 0.96 for all extractionconditions.KeyWords: N-Methyl-2-pyrrolidinone, Ethylenediamine, solvent ekstraction,ashless coal, solvent swelling