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Language: English

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

Publication history: Received April 24, 2007
Accepted October 29, 2007

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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Production of low ash coal by thermal extraction with N-methyl-2-pyrrolidinone

Sang Do Kim Kwang Jae Woo¹ Soon Kwan Jeong Young Jun Rhim Si Hyun Lee^†

Clean Coal Technology Research Center, Korea Institute of Energy Research, 71-2 Yuseong, 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 Journal of Chemical Engineering, July 2008, 25(4), 758-763(6), 10.1007/s11814-008-0124-0

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Abstract

Present study was conducted for the purpose of producing low ash coal from LRC (low rank coals) such as lignite and sub-bituminous coal through thermal extraction using polar solvent. Extraction from bituminous coal was also investigated for comparison. NMP as a polar solvent was used. The ratio of coal to solvent was adjusted as 1 : 10. Experimental conditions were established which include the extraction temperature of 200-430 ℃, initial applied pressure of 1-20 bar and extraction time of 0.5-2 hr were used. Extraction yield and ash content of extracted and residual coal were measured. The extraction yield increased with the increase of extraction temperature, and the ash content of extracted coal decreased below 0.4% at 400 ℃ from the raw coal samples that have the ash contents of 4-6%. According to the analysis of experiments results, fixed carbon and calorific value increased, and H/C and O/C decreased.

Keywords

LRC (Low Rank Coal) Solvent Extraction Thermal Extraction Clean Coal Ash-free Coal

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