Alkali-assisted coal extraction with polar aprotic solvents

Show simple item record Makgato, M.H. (Matlou Hector) Moitsheki, L.J. Shoko, Lay Kgobane, B.T. (Bethuel Lesole) Morgan, D.L. Focke, Walter Wilhelm 2009-03-12T06:11:00Z 2009-03-12T06:11:00Z 2009
dc.description.abstract Coal extraction experiments were conducted using a coal, containing ca. 10% ash, from the Tshikondeni mine in South Africa. This coal dissolves only to a limited extent in pure polar aprotic solvents such as dimethylformamide (DMF) and N-methyl-2-pyrrolidinone (NMP). However, the addition of a strong base, e.g. sodium hydroxide (NaOH) or sodium tert-butoxide increased the degree of coal dissolution in these organic solvents. Depending on the extraction conditions, carbon extraction efficiencies of up to 90% were obtained. Carbon precursor material was recovered from the solution as a gel by precipitation with water. Ash content was reduced from 10% in the coal to less than 1.6% in the coal extracts. Sodium sulfide (Na2S) addition further reduced ash content and aided the recovery of carbon precursors that led to graphitizable cokes but the degree of extraction was significantly reduced. en_US
dc.identifier.citation Makgato, MH, Moitsheki, LJ, Shoko, L, Kgobane, BL, Morgan, DL & Focke, WW 2009, 'Alkali-assisted coal extraction with polar aprotic solvents', Fuel Processing Technology, 2009, 8 p.[doi:10.1016/j.fuproc.2008.12.016] en_US
dc.identifier.issn 0378-3820
dc.identifier.other 10.1016/j.fuproc.2008.12.016
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.rights Elsevier en_US
dc.subject Coal en_US
dc.subject Solvent extraction en_US
dc.subject Coke en_US
dc.subject Graphite en_US
dc.subject.lcsh Coal -- Analysis
dc.subject.lcsh Extraction (Chemistry)
dc.title Alkali-assisted coal extraction with polar aprotic solvents en_US
dc.type Postprint Article en_US

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