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Ultrasonic Effect on the Extraction of Ash-free coal from Low Rank Coal  

Lee, Sihyun (Clean Coal Technology Research Center, Korea Institute of Energy Research)
Kim, Sangdo (Clean Coal Technology Research Center, Korea Institute of Energy Research)
Jeong, Soonkwan (Clean Coal Technology Research Center, Korea Institute of Energy Research)
Rhim, Youngjun (Clean Coal Technology Research Center, Korea Institute of Energy Research)
Kim, Daehun (Clean Coal Technology Research Center, Korea Institute of Energy Research)
Woo, Kwangjae (Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology)
Publication Information
Korean Chemical Engineering Research / v.46, no.3, 2008 , pp. 555-560 More about this Journal
Abstract
Extraction was performed to prepare ash-free coal from low rank coal under the temperature of $200-430^{\circ}C$ and initial pressure of 0.1MPa. Three kinds of coal samples with different rank were used and N-methyl-2-pyrrolidinone(NMP, polar), 1-methyl naphthalene(I-MN, non-polar), Light Cycle Oil(LCO, non-polar) were used as solvents. Results showed that higher extraction yield could be obtained with NMP than with 1-MN and LCO, but the ash concentration shows minimun in the case of 1-MN. Three operation modes were compared, that is, idle, agitation and ultrasonic extraction mode. From the results, it was found that the extraction yield and ash concentration were 70.09% and 1.03% under the agitation mode, 80.7% and 0.76% under the ultrasonic operation mode respectively in the case of NMP used at the temperature of $350^{\circ}C$. Similar results were obtained with 1-MN. Effect of ultrasonic on the extraction was estimated as 15-20% increase in the yields and 26% reduction in the ash concentration.
Keywords
Low Rank Coal; Brown Coal; Ash-free Coal; Solvent Extraction; Ultrasonic;
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Times Cited By KSCI : 1  (Citation Analysis)
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