dc.contributor.author | Uwaoma, R.C. | |
dc.contributor.author | Strydom, C.A. | |
dc.contributor.author | Matjie, R.H. | |
dc.contributor.author | Bunt, J.R. | |
dc.date.accessioned | 2020-02-25T07:04:26Z | |
dc.date.available | 2020-02-25T07:04:26Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Uwaoma, R.C. et al. 2018. Direct liquefaction of 2 South African bituminous coal fines and their beneficiated float fractions. 10th International Conference on Advances in Science, Engineering, Technology & Healthcare (ASETH-18), 19-20 Nov 2018, Cape Town, South Africa:43-48. [https://doi.org/10.17758/EARES4.EAP1118217] | en_US |
dc.identifier.isbn | 978-81-938365-2-1 | |
dc.identifier.uri | http://hdl.handle.net/10394/34189 | |
dc.identifier.uri | https://www.eares.org/siteadmin/upload/5843EAP1118217.pdf | |
dc.identifier.uri | https://doi.org/10.17758/EARES4.EAP1118217 | |
dc.description.abstract | The direct liquefaction of South African coal fines
and their density separated (float) fractions were carried out
under moderate conditions in a laboratory autoclave. The
liquefaction temperature ranged between 380 and 420 oC, using
tetralin as a solvent and an initial nitrogen gas pressure of 3 MPa.
Results from the liquefaction tests showed that the carbon
conversion and oil yields were high for the float fractions when
compared to the coal fines. Waterberg and Highveld coal float
fractions achieved a high carbon conversion of 50.7 wt % daf and
52.7 wt % daf respectively, compared with < 42 wt % daf carbon
conversion for the coal fines. The effectiveness of the carbon
conversion was correlated with the reactive macerals and the
surface area of the individual samples. It was observed that the
density separated coal fraction, which has a higher surface area,
higher vitrinite content and higher reactive macerals content
yielded higher extraction efficiencies. The residues and extracts
obtained during the liquefaction tests were characterised using
nuclear magnetic resonance spectroscopy, proximate and ultimate
analyses. The analytical results indicated that the residue showed a
slight decrease in calorific value and aliphatic components, with a
lower H/C ratio and a higher ash content. Also, the results showed
that using the float fractions of South African coals at a moderate
liquefaction temperature could be beneficial in the production of
liquid fuel | en_US |
dc.language.iso | en | en_US |
dc.publisher | EARET | en_US |
dc.subject | Direct liquefaction | en_US |
dc.subject | South African bituminous coal fines | en_US |
dc.title | Direct liquefaction of 2 South African bituminous coal fines and their beneficiated float fractions | en_US |
dc.type | Presentation | en_US |
dc.contributor.researchID | 25452622 - Uwaoma, Romanus Chinonso | |
dc.contributor.researchID | 20682972 - Strydom, Christiena Adriana | |
dc.contributor.researchID | 20164200 - Bunt, John Reginald | |
dc.contributor.researchID | 21166625 - Matjie, Ratale Henry | |