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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received January 28, 2008
Accepted April 14, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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저등급 석탄으로부터 초청정석탄의 추출과 초음파의 영향

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

이시훈^† 김상도 정순관 임영준 김대훈 우광재¹

Sihyun Lee^† Sangdo Kim Soonkwan Jeong Youngjun Rhim Daehun Kim Kwangjae Woo¹

한국에너지기술연구원 기후변화기술연구본부 청정석탄연구센터, 305-343 대전광역시 유성구 장동 71-2 ¹한국화학연구원 신화학연구단 석유대체연구센터, 305-343 대전광역시 유성구 신성로 19

Clean Coal Technology Research Center, Korea Institute of Energy Research, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea ¹Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology, Sinseongno 19 Yuseong, Daejeon 305-343, Korea

LSH3452@kier.re.kr

Korean Chemical Engineering Research, June 2008, 46(3), 555-560(6), NONE Epub 7 July 2008

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Abstract

저등급 석탄으로부터 무회분 초청정 석탄 제조를 위하여 온도 200-430 ℃, 0.1MPa에서 추출실험을 수행하였다. 세가지의 서로 다른 등급의 석탄시료를 사용하였으며 추출용매는 극성용매 N-methyl-2-pyrrolidinone(NMP)와 비극성 용매 1-methyl naphthalene(1-MN), Light Cycle Oil(LCO)를 사용하였다. 실험결과 NMP에 의한 추출율이 1-MN이나 LCO에 의한 추출율 보다 높게 나타났다. 그러나 회분농도는 1-MN에 의한 추출탄이 가장 낮았다. 세가지 추출 운전모드, 즉 무교반운전모드, 교반운전모드, 그리고 초음파를 이용한 운전모드를 각각 수행하였다. 추출온도 350 ℃에서 NMP를 사용한 추출실험에서, 교반운전모드에서의 추출율 및 추출탄의 회분농도는 각각 70.09wt%(daf), 1.03wt%(db) 이었으며, 초음파를 이용한 운전모드에서의 추출율 및 추출탄의 회분농도는 각각 80.70wt%(daf), 0.76wt%(db) 이었다. 1-MN를 사용한 추출에서도 NMP의 경우와 같이 초음파 추출이 가장 우수한 추출특성을 나타냈다. 초음파를 이용한 추출방법은 교반추출과 비교하여 추출율을 15-20%, 회분 저감은 최대 26% 까지 향상시킬 수 있었다.

Extraction was performed to prepare ash-free coal from low rank coal under the temperature of 200-430 ℃ 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 ℃. 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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